Standard & rechargeable batteries

Discover our selection of the best rechargeable batteries and cells in 2026.

There is a considerable choice when it comes to batteries, rechargeable batteries and cells on today's market. The technical needs required by the large number of electrical devices that exist mean that batteries are available in a great many variants, both in terms of formats (cylindrical, square or button cells) and power, capacity, voltage, dimensions or types (Lithium, alkaline, saline, Ni-MH...). Certain brands, such as Energizer or Duracell, need no introduction, and act as a reference, and some types of battery are extremely popular and used all over the world.
We have therefore decided to present, in this category of our shop, a wide range of batteries, rechargeable or not, spread across different formats, choosing only the best models and the best brands, among the most common or sought-after battery types.
You will therefore find here the best in batteries and rechargeable cells in 2026 · 50 products

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I - AAA batteries

Ultra compact and commonly used in a large number of devices (remote controls, toys, lamps…), AAA / R03 / LR03 batteries (also called Micro batteries) are extremely practical and popular. We present here the batteries and rechargeable cells in AAA format that we recommend.

Ultra Power AAA (x12) Duracell Ultra Power AAA (x12)
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Duracell Ultra Power AAA (x12)

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Do Duracell batteries really need an introduction? Discover the Ultra Power AAA (1.5V), sold here in packs of 12.

  • Voltage: 1.5V
  • Rechargeable: No
  • Pack size: Pack of 12
  • Duracell quality, long shelf life, charge tester
Duracell brand alkaline batteries are among the most widely used in the world. These Ultra Power AAA / R03 batteries are equipped with a Powerchek load tester (activated by finger pressure) which lets you check their level. These 1.5V batteries are sold in packs of 12. Their energy can be conserved for up to 10 years, thanks to Duralock technology. The pink rabbit brand offers here one of the best batteries in AAA format.
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Eneloop AAA 800mAh Panasonic Eneloop AAA rechargeable batteries
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Panasonic Eneloop AAA 800mAh

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The benchmark AAA rechargeable batteries: up to 2100 charge cycles, ready to use and able to keep 70% of their energy after 10 years of storage.

  • Capacity / Voltage: 800 mAh / 1.2V
  • Rechargeable: Yes, up to 2100 cycles
  • Pack: Pack of 4 (Ni-MH)
  • 70% capacity kept after 10 years, ready to use
Rechargeable up to 2100 times, which is exceptional, the Eneloop AAA from Japanese brand Panasonic are designed to be as durable as possible. With a capacity of 800 mAh and already charged at purchase (with solar energy, for eco-responsibility), these cells keep up to 70% of their capacity after 10 years of storage. That is why they are the first choice of forward-thinking users who like to keep a number of them in stock, ready to use.
In-depth reviewRead our full review → 3.9/5 The Eneloop AAA have been with us for years, and they have never disappointed. We drop them into remotes, controllers, a small headlamp and a mouse, and they get the job done without complaint. Like their bigger AA siblings, their key strength is low self-discharge: forgotten for months in a drawer, they come out almost full, ready to use, where other cells would already be flat. The 800 mAh capacity is naturally more modest than an AA, but it is more than enough for AAA-powered devices, which are usually low-drain. Sold in packs of 4, they quickly pay off against disposables, especially with a good charger. One usage tip: like any NiMH cell, they deliver 1.2V instead of 1.5V, with no consequence in the vast majority of cases. Reliable, durable and eco-friendly, they are one of those smart buys you never regret.
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Eneloop Pro AAA 930mAh Panasonic Eneloop Pro AAA 930 mAh rechargeable batteries
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Panasonic Eneloop Pro AAA 930mAh

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The high-capacity AAA version of the Eneloop: 930 mAh to last longer in power-hungry devices, wireless mics, headlamps or demanding mice.

  • Capacity / Voltage: 930 mAh (min. 900) / 1.2V
  • Rechargeable: Yes, up to 500 cycles (Ni-MH)
  • Pack size: Pack of 4
  • Highest AAA capacity in the Eneloop range
The Panasonic Eneloop Pro AAA are the high-capacity variant of the Eneloop line in the AAA format. With 930 mAh (versus 800 mAh for standard Eneloop), they are the brand's most enduring AAA NiMH cells, designed for devices that drain batteries fast: wireless mics, powerful headlamps, gaming mice, toys. Shipped pre-charged and ready to use, they keep up to 85% of their capacity after a year of storage. In return, they handle fewer cycles than standard Eneloop (about 500). Sold in packs of 4.
In-depth reviewRead our full review → 3.8/5 In AAA, capacity quickly makes the difference, and that is where the Eneloop Pro stand out. We put them in a wireless lavalier mic and a trail headlamp, two devices that draw hard on small cells, and the runtime gained over standard AAA is clear: you record longer, you light longer. They arrive charged and ready to use, and hold their charge well between sessions. As on the AA version, the trade-off is the cycle count: about 500 recharges, versus over 2000 for standard Eneloop, and slightly faster self-discharge at rest. For remotes or a clock, standard Eneloop remain more suitable and more durable. But for any power-hungry AAA device, these Pro offer the best runtime available in this format. A worthwhile investment for anyone using demanding gear.
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II - AA batteries

AA (or LR6) batteries are the most common batteries in the world, and their popularity is understandable, given their large capacity for a particularly compact and practical format. Here is our selection of batteries and rechargeable cells in AA format.

Ultimate Lithium AA (x4) Energizer Ultimate Lithium AA LR6 FR6 battery
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Energizer Ultimate Lithium AA (x4)

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The longest-lasting AA battery in the world: the Energizer Ultimate Lithium takes on the most power-hungry devices, from deep cold to heat, with 25 years storage.

  • Voltage: 1.5V (lithium)
  • Format: AA / LR6 / FR6
  • Pack: Pack of 4
  • Storage: Up to 25 years
  • The most enduring AA battery, from -40 to 60 °C
Energizer Ultimate Lithium AA batteries (LR6 / FR6) are 1.5-volt lithium batteries, billed as the longest-lasting AA batteries in the world. Far more enduring than alkaline on power-hungry devices (cameras, flashes, GPS, detectors, toys, controllers), they work from -40 to 60 °C and are 33% lighter. Sold in packs of 4, they store for up to 25 years in the packaging and resist leaks.
In-depth reviewRead our full review → 4.0/5 The Energizer Ultimate Lithium AA delivers on a real promise, but very unevenly depending on the device it powers. In a motorised toy or a power-hungry audio device, the runtime gain over an alkaline exceeds 60%, a clear, immediately noticeable difference. In a low-drain device such as a clock or a clock radio, that same gain drops to under 5%, a nuance the usual marketing pitch never spells out, and one that should stop anyone generalising the promise to every use. Its claimed shelf life of up to 25 years makes it a solid pick for backup batteries, and it resists leaks well over long storage. One nuance on flash photography, despite being a use Energizer promotes: it recycles more slowly between flashes than a rechargeable NiMH battery such as an Eneloop, even though it allows more flashes in total before running out. For high-drain use, outdoors or in severe cold, it remains a solid benchmark; for a low-drain device, the premium over a standard alkaline is mainly justified by that long shelf life.
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4006 AA Batteries (x40) Varta 4006 AA Batteries (x40)
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Varta 4006 AA Batteries (x40)

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Batteries from the Varta Industrial line are both economical and reliable, and we offer them here packaged in 40s.

  • Capacity / Voltage: 2600mAh / 1.5V
  • Rechargeable: No
  • Pack size: Pack of 40
  • Affordable, no need to buy more for a long time
Made in Germany, Varta Industrial batteries are both reliable and worthy of the highest quality standards. Guaranteed to be stored for 10 years, and with an excellent quality/price ratio, these Alkaline AA / LR6 batteries have a nominal capacity of 2600mAh. These 1.5V batteries will be perfect for powering your devices. And after buying a set of 40 units, you should be set for quite a while.
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Eneloop AA 1900mAh Panasonic Eneloop AA rechargeable batteries
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Panasonic Eneloop AA 1900mAh

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The benchmark AA rechargeable batteries: up to 2100 charge cycles, ready to use and able to keep 70% of their energy after 10 years of storage.

  • Capacity / Voltage: 1900 mAh (min.) / 1.2V
  • Rechargeable: Yes, up to 2100 cycles
  • Pack: Pack of 8 (Ni-MH)
  • 70% capacity kept after 10 years, ready to use
Rechargeable up to 2100 times, Panasonic Eneloop AA batteries are the benchmark for durable NiMH cells. With a minimum capacity of 1900 mAh (2000 mAh typical), they ship pre-charged with solar energy and ready to use. Their very low self-discharge lets them keep up to 70% of their capacity after 10 years of storage, making them the choice of forward-thinking users. Sold in packs of 8, they are a great replacement for disposable batteries in controllers, remotes, toys, mice and flashes.
In-depth reviewRead our full review → 4.0/5 It is hard to find anything more reliable than Eneloop, and you quickly understand why they are so widely praised. We use them daily in game controllers, remotes, a wireless mouse and a camera flash, and they take it all without complaint. Their real strength is low self-discharge: pulled from a drawer after months of neglect, they are still full and ready to use, where cheap rechargeables would be flat. On the flash, they keep the pace without weakening, a good sign of their consistency. Sold in packs of 8, they quickly pay for themselves against disposables, especially with a good charger. The 1900 mAh capacity is slightly below the Pro versions (2500 mAh), but in return they handle many more cycles and age better. The only small downside, like any NiMH cell, is that they deliver 1.2V instead of the 1.5V of an alkaline, which can bother a few very voltage-sensitive devices. For everything else, it is a purchase you never regret.
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LR 3000mAh Batteries (x4) Xtar 1.5V USB-C rechargeable AA battery
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Xtar LR 3000mAh Batteries (x4)

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The Xtar LR 3000mAh AA batteries hold a true constant 1.5V right to the end, recharge over USB-C with no dedicated charger, and last over 1200 cycles.

  • Capacity: 3000 mAh (≈4500 mWh)
  • Voltage: 1.5 V constant (vs 1.2 V on NiMH)
  • Charging: USB-C, 3.9 h, 4-in-1 cable included
  • Pack size: Pack of 4 batteries + case
  • True 1.5V plus built-in USB-C, no dedicated charger
The Xtar LR 3000mAh are rechargeable lithium AA batteries that deliver a genuine 1.5V, where classic NiMH rechargeables cap out at 1.2V. Each cell has its own built-in USB-C port, so there's no dedicated charger to buy: a full charge takes 3.9 hours with the included 4-in-1 cable. Ideal for voltage-sensitive gear (thermostatic radiator valves, smart locks, controllers) that often reads a NiMH cell's 1.2V as flat. Sold as a pack of 4 with cable and storage case.
We ran a set of Xtar LR 3000mAh in a smart lock and in a couple of thermostatic radiator valves, two devices notoriously fussy with regular rechargeables: no false low-battery warnings since, the voltage stays pinned much closer to 1.5V than any NiMH cell manages. The best everyday feature is the included 4-in-1 cable, which charges all 4 batteries at once from a single USB-C port in the claimed 3.9 hours, no dedicated charger needed. In a heavily used game controller, runtime comfortably matches disposable alkalines, with the added bonus of recharging as often as you like. Two honest caveats: on a set of 4, it isn't unusual for one cell to hold charge slightly worse than the other three (an isolated issue, but one several buyers report), and it's safer to recharge with a plain USB cable rather than a beefy PD fast charger, since some users hit charging glitches with that kind of adapter. For anyone done with throwing away batteries or fighting NiMH's 1.2V, this pays for itself quickly.
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Eneloop Pro AA 2500mAh Panasonic Eneloop Pro AA 2500 mAh rechargeable batteries
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Panasonic Eneloop Pro AA 2500mAh

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The high-capacity version of the Eneloop: 2500 mAh to last longer in power-hungry devices like camera flashes, game controllers or demanding toys.

  • Capacity / Voltage: 2500 mAh (min. 2450) / 1.2V
  • Rechargeable: Yes, up to 500 cycles (Ni-MH)
  • Pack size: Pack of 4
  • Highest Eneloop capacity, ideal for power-hungry devices
The Panasonic Eneloop Pro AA are the high-capacity variant of the famous Eneloop line. With 2500 mAh (versus 1900 mAh for standard Eneloop), they are the brand's most enduring NiMH rechargeable cells, designed for power-hungry devices: camera flashes, game controllers, toys, powerful lights. Shipped pre-charged and ready to use, they keep up to 85% of their capacity after a year of storage. In return for that capacity, they handle fewer cycles than standard Eneloop (about 500 versus 2100). Sold in packs of 4.
In-depth reviewRead our full review → 3.8/5 We keep a set of Eneloop Pro AA in the camera bag, and that is really where they shine. On a speedlight flash, the capacity difference against standard Eneloop shows: recycle time stays fast for longer, and you get more shots before needing a recharge. Same story on a heavily used game controller or a demanding light, where the 2500 mAh give plenty of headroom. They arrive charged, ready to use, and hold their charge well from one session to the next. The trade-off to know is their longevity: the Pro version handles fewer cycles than the standard Eneloop (about 500 versus 2100) and self-discharges a little faster at rest. In other words, for everyday use in low-drain devices (remotes, mice), standard Eneloop remain more relevant and more durable. But as soon as a device demands a lot of energy, the Pro clearly make the difference. An excellent buy for anyone who shoots with flash or games a lot.
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III - 18650 batteries

An iconic format popularised by e-cigarettes and torches, the 18650 battery (18 x 65 mm) remains the reference for the best size-to-capacity ratio in powerful rechargeable energy. Here is our selection of the best 18650 cells on the market, protected or not, flat top or button top:

NCR18650B 3400mAh Panasonic NCR18650B 3400 mAh 18650 battery
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Panasonic NCR18650B 3400mAh

£6.95 (11)

The undisputed benchmark of 18650 batteries: 3400 mAh of capacity, flawless Japanese quality and reliability that make it the basis of many battery packs.

  • Capacity / Voltage: 3400 mAh / 3.6V-3.7V
  • Rechargeable: Yes, Lithium-ion (Flat Top)
  • Pack size: Sold per cell
  • The 18650 benchmark, high capacity and reliability
The Panasonic NCR18650B is the benchmark lithium-ion cell in the 18650 format. With 3400 mAh, a nominal voltage of 3.6 to 3.7V and proven reliability, it is one of the highest-capacity and most sought-after cells of this format. We offer it here in an unprotected Flat Top version (65 x 18 mm), the most compatible with torches and devices. It also serves as the basis for many packs, power banks and e-bikes. Beware of the many counterfeits online: the ones offered here are 100% genuine.
In-depth reviewRead our full review → 4.0/5 In the 18650 world, the NCR18650B is the yardstick, and for good reasons. We used it in high-end torches and to rebuild a small pack, and every time the rated capacity is there: 3400 mAh is among the best in a cell of this format, with runtime that is clearly noticeable against low-end 18650s. Consistency is the other strength: from one cell to the next, performance is steady, which matters when you assemble several in series or parallel. We chose the unprotected Flat Top version, more compact and accepted by more devices, but that is a point to check: some lights require a protected cell (Button Top), slightly longer. Another warning, and not a minor one: counterfeits abound online for this format, often recycled cells sold above their real capacity, hence the importance of a serious source. Finally, like any bare lithium cell, it requires a suitable charger and careful handling. For anyone who knows what they are doing, it is simply the best 18650 basis on the market.
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NCR18650GA 3450mAh Panasonic NCR18650GA 18650 high-drain battery
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Panasonic NCR18650GA 3450mAh

£6.95 (10)

The Panasonic NCR18650GA pairs 3450 mAh of capacity with a 10A continuous discharge rating: the high-drain 18650 cell favoured by connoisseurs.

  • Capacity / Voltage: 3450 mAh / 3.6V-3.7V
  • Continuous discharge: 10A, high-drain format
  • Rechargeable: Yes, Lithium-ion (Flat Top)
  • The best capacity/drain balance in the 18650 format
The Panasonic NCR18650GA is a high-performance 18650 lithium-ion cell combining 3450 mAh of capacity with a 10A continuous discharge rating, a rare profile that makes it the connoisseur's choice for very powerful torches and sub-ohm vaping. Supplied here in an unprotected Flat Top version (65.3 x 18.3 mm), it complements the NCR18650B for any use that demands more current. Beware of the many counterfeits of this widely copied format: this one is 100% genuine.
In-depth reviewRead our full review → 4.1/5 We already knew the NCR18650B, but the NCR18650GA targets a different crowd: those who need real current. Tested in a tactical torch rated at 3000 lumens and in a rebuildable dual-coil mod at 0.15 ohm, it never heated up worryingly, unlike other similar-capacity cells that start to struggle under load. Runtime remains excellent: on the torch, we easily gained 20 to 30 minutes of intensive use compared with classic 10-15A cells of equal capacity. One small downside, it costs a bit more than the NCR18650B for near-identical capacity, a premium that only makes sense if your device genuinely draws more than 2 to 3A continuously. And as always with this format, stay alert to the counterfeits flooding online marketplaces: a serious source beats a price that looks too good to be true. Overall, a formidably efficient cell for anyone who needs power without sacrificing capacity.
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IMR18650V1 3500mAh Efest 18650 high-drain battery 3500mAh
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Efest IMR18650V1 3500mAh

£7.49 (8)

A high-drain 18650 cell from Efest: 3500mAh, 10A continuous and the reliability of a brand trusted by torch and vaping enthusiasts alike.

  • Capacity / Voltage: 3500mAh / 3.6V-3.7V
  • Continuous discharge: 10A (up to 20A pulse)
  • Format: 18650 Flat Top, unprotected
  • High-drain IMR cell, trusted Efest reliability
The Efest IMR18650V1 is a lithium-ion cell in the 18650 format built for high-drain use. With 3500mAh and a 10A continuous current (up to 20A pulse according to Efest), it targets powerful torches, vape mods and home-built battery packs that need sustained current rather than plain runtime. Supplied as an unprotected Flat Top (18.25 x 65.25mm), compatible with most cell holders. Efest is a well-known name among bare-cell users, valued for its consistency from one cell to the next.
We mostly knew Efest for its chargers, but the brand also holds its own among serious 18650 cells. Tested in a torch with a turbo mode and in a regulated vape mod, the IMR18650V1 holds its rated 3500mAh without a harsh voltage drop near the end of the charge, which is not a given at this price point. The 10A continuous rating comfortably covers the vast majority of torches and mods on the market, with the 20A pulse figure more of a safety margin than an everyday draw. One caveat: like any unprotected Flat Top cell, it will not fit torches that require a built-in protection circuit (Button Top format), worth checking before buying. Build quality feels consistent from one cell to the next, which matters as soon as you assemble several into a pack. For anyone comfortable handling a bare cell with the right precautions, it is a solid pick in high-drain 18650.
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ARB-L18-3500U Fenix ARB-L18-3500U 18650 USB-rechargeable battery
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Fenix ARB-L18-3500U

£24.95 (6)

A premium 18650 battery that recharges directly via a built-in micro-USB port, with no external charger: 3500 mAh, an LED indicator and multiple protections.

  • Capacity / Voltage: 3500 mAh / 3.6V
  • Rechargeable: Yes, via built-in micro-USB (Lithium)
  • Pack size: Sold individually
  • Direct USB charging, LED indicator, multiple protections
Fenix, famous for its ultra-powerful torches, offers here an innovative 18650 battery. Its unique feature: a built-in micro-USB port that lets you recharge it anywhere, from a computer, a phone charger or a power bank, with no dedicated charger. With a 3500 mAh capacity, an LED charge indicator and multiple protections (short circuit, overcharge, overheating, deep discharge), it is one of the most reliable 18650 cells on the market. Note: its 70 mm length, slightly longer than standard.
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IV - 21700 batteries

Larger and higher-capacity than the 18650 whose uses it shares (powerful torches, e-bikes, custom packs), the 21700 battery (21 x 70 mm) has established itself in recent years as the premium format for cylindrical cells. Here is our selection of the best 21700 cells:

50E 21700 (5000mAh) Samsung INR21700-50E 5000mAh lithium cell
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Samsung 50E 21700 (5000mAh)

£2.95

The benchmark high-capacity 21700 cell: the Samsung 50E offers 5000mAh in a compact format, ideal for powerful torches, scooters and DIY batteries.

  • Format: 21700 (INR21700-50E)
  • Capacity: 5000 mAh
  • Continuous discharge: About 9.8A
  • Nominal voltage: 3.6V (lithium-ion)
  • 5000mAh, the best capacity/price ratio in 21700
The Samsung 50E cell (INR21700-50E) is a rechargeable lithium-ion cell in the 21700 format, renowned for its excellent capacity/price ratio. With its 5000mAh and a continuous discharge current of about 9.8A, it offers a very good balance between runtime and power. It is used in powerful torches, electric scooters and bikes, DIY battery packs and electronic mods. This is a bare, unprotected cell, reserved for experienced users.
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P42A 21700 (4200mAh) Molicel P42A 21700 high-drain battery
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Molicel P42A 21700 (4200mAh)

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The 21700 sibling of the 18650 benchmark: 4200mAh and 45A continuous, built for cordless tools, ultra-powerful flashlights and demanding electronics.

  • Format: 21700
  • Capacity: 4200mAh
  • Continuous discharge: 45A
  • Nominal voltage: 3.6V (max 4.2V)
  • 45A continuous, THE 21700 high-drain benchmark
The Molicel P42A is the 21700 version of the famed P26A, a Taiwanese high-drain lithium-ion cell trusted by flashlight and power tool enthusiasts. With 4200mAh and a 45A continuous discharge rating, it far outclasses generalist 21700 cells on instant power. Sold as a bare, unprotected Flat Top cell for experienced users.
In-depth reviewRead our full review → 4.1/5 We tested several P42A cells in a DIY power tool pack and a very demanding torch, and the verdict is clear: this cell handles high current without heating up or sagging in voltage, where a generalist high-capacity 21700 quickly shows its limits. The Flat Top format fits most cell holders and packs. Capacity (4200mAh) trails the best high-capacity cells on the market (up to 5000mAh), but under heavy load, real-world runtime feels better than with a cell that is not built for the job. One real caveat: it is a bare, unprotected cell, strictly for experienced users with a proper lithium charger and the usual safety precautions. For anyone who needs instant power in a 21700 format, it is a proven, trusted choice.
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21GT-50 5000mAh Klarus 21GT-50 5000mAh 21700 battery
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Klarus 21GT-50 5000mAh

£22.00 (4)

The 21GT-50 is Klarus's high-capacity 21700 battery: 5000mAh, 15A continuous discharge and a built-in protection circuit for the most demanding torches and devices.

  • Capacity / Discharge: 5000mAh / 15A continuous
  • Protection: Built-in circuit (overcharge, over-discharge, short circuit)
  • Format: 21700 Button Top, 75 x 21.5mm, 72g
  • Energy: 18Wh, 500+ cycles
  • 5000mAh and 15A, Klarus's high-capacity cell
The Klarus 21GT-50 is a rechargeable lithium-ion battery in the 21700 format, designed by Klarus for its most powerful flashlights (XT21X Pro, G15) while staying compatible with most devices that take this size of interchangeable cell. With 5000mAh of capacity, a 15A continuous discharge current and a built-in protection circuit against overcharge, over-discharge and short circuit, it offers a generous energy reserve for tactical torches and current-hungry devices.
The 21GT-50 has done several outings in a Klarus XT21X Pro, and the pairing delivers on its promise: the 5000mAh rating translates into noticeably longer runtime than an 18650, without the 21700 format weighing the whole thing down too much. The 15A continuous discharge has plenty of headroom for the current spikes of very high-output torches, with no excess heat noted during our testing. The internal protection circuit cuts off cleanly at full charge (4.2V) and on low discharge (2.75V), a real comfort compared with a bare cell you have to monitor yourself. One honest gripe: at 72g and 75mm long, it doesn't fit every 21700 housing on the market, with some older adapters or torches machined right to the limit. Like other flashlight brands, Klarus doesn't manufacture the lithium cell core in-house but fits its own circuit and quality control, a common practice with no bearing on the reliability we've seen. For a high-end Klarus torch or any current-hungry 21700 device, it's a safe bet.
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NL2160 21700 (6000mAh) Nitecore 21700 high-capacity battery 6000 mAh
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Nitecore NL2160 21700 (6000mAh)

£30.95 (1)

The Nitecore NL2160 pushes the 21700 format to 6000 mAh: a record capacity to power demanding torches, packs and devices for longer.

  • Capacity / Voltage: 6000 mAh / 3.6V (21.6Wh)
  • Continuous discharge: 8A maximum
  • Water resistance: IPX6
  • Type: Protected Button Top (21700)
  • 6000 mAh, one of the highest capacities on the market
The Nitecore NL2160 is a protected 21700 battery that reaches 6000 mAh, one of the highest capacities on the market for this format. Built for powerful torches and headlamps, it supports a continuous discharge of up to 8A and benefits from IPX6 water resistance, a genuine plus outdoors. Its built-in protection circuit (overcharge, over-discharge, short circuit) and pressure relief valve make it a reliable cell for intensive use.
We tested the NL2160 in a high-power search light, the kind of device that drains a battery in one evening: the runtime gain over a standard 4000 or 5000 mAh 21700 is noticeable straight away, almost an extra evening before recharging. The IPX6 rating also proved itself on an outing in the rain, without a shred of worry for the torch's electronics. One minor drawback: with no built-in USB port, you need an external 21700-compatible charger, and its slightly above-average diameter kept it from fitting into an older cell holder that was supposedly built for this format, so it's worth checking compatibility before buying. For anyone after the biggest protected 21700 capacity around right now, it's hard to beat.
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V - 26650 batteries

Wider than the 21700, the 26650 battery (26 x 65 mm) targets very powerful torches and packs needing high capacity per cell. A less common format but a favourite among demanding users. Here is our selection:

IMR26650 4200mAh Efest 26650 high-drain battery 4200mAh
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Efest IMR26650 4200mAh

£8.99 (6)

Efest's high-capacity 26650: 4200mAh and 35A continuous discharge (50A pulse) for seriously powerful torches and demanding DIY packs.

  • Capacity / Voltage: 4200mAh / 3.6V-3.7V
  • Continuous discharge: 35A (up to 50A pulse)
  • Format: 26650 Flat Top, unprotected
  • High-capacity 26650 with strong continuous discharge
The Efest IMR26650-4200 is a lithium-ion cell in the 26650 format, the widest of the common cylindrical formats, built to combine high capacity with strong discharge. With 4200mAh and a 35A continuous current (up to 50A pulse according to Efest), it targets very powerful torches and DIY battery packs needing high capacity per cell. Supplied as an unprotected Flat Top (26.5 x 66.4mm, 88.4g), it is a less common format than 18650 or 21700, reserved for devices specifically designed to take it.
The 26650 format remains a niche next to 18650 or 21700, but for anyone with a torch built to take it, the Efest IMR26650-4200 delivers on its promise. Used in a wide-body torch on extended turbo mode, it shrugs off the heaviest current draws, and the extra runtime over a standard 21700 is clearly noticeable on long sessions. The rated 4200mAh matches the measured discharge time, without the shortfall you sometimes find on lesser 26650 cells. The one real downside: it is a bulky, heavy format (88g each), best reserved for devices that genuinely call for it, and the choice of compatible torches and chargers stays narrower than for an 18650. As always with a bare Efest cell, consistency in manufacturing from one unit to the next is the real strength, reassuring for anyone who needs to pair several cells in the same pack.
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26650P 5500mAh Soshine 26650 5500mAh protected battery
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Soshine 26650P 5500mAh

The most versatile 26650 format: 5500mAh protected in an ultra-compact 68.5mm body, compatible with a maximum number of powerful torches.

  • Capacity / Voltage: 5500 mAh / 3.7V
  • Dimensions: 26.6 x 68.5 mm
  • Protection: Built-in PCB circuit
  • Continuous discharge: Up to 8A
  • Protected under 69mm, fits demanding torches
The Soshine 26650P-3.7-5500 is a rechargeable lithium-ion battery in the 26650 format, the largest of the mainstream cylindrical formats, built for very powerful torches and demanding DIY packs. With a rated 5500mAh (around 5200 to 5300mAh measured in real-world community tests), a nominal voltage of 3.7V and a built-in protection circuit (overcharge, over-discharge, short-circuit), it makes a lithium cell safer to use. Its 68.5mm length makes it one of the few protected 26650 cells that still fits torches that reject longer protected cells.
We tested this Soshine 26650 for several weeks, in a high-power torch and then for a small DIY pack. First finding: the rated 5500mAh capacity broadly holds up, even though our measurements land closer to 5200 to 5300mAh real-world, which is still very good for a protected cell. The real strength of this Soshine is its length: at 68.5mm, it fits torches that usually reject protected 26650 cells, often a few millimetres too long. The built-in protection circuit is reassuring for everyday use, without replacing basic precautions: it is still a lithium cell, to be charged with a dedicated charger. One small gripe: the packaging stays basic and you need to order it outside the usual Amazon channels. For anyone after a compact, reliable protected 26650, it clearly earns its place.
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26650 5500mAh Keeppower 26650 5500mAh protected cell
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Keeppower 26650 5500mAh

£15.64

A high-capacity 26650 cell from a brand known for its built-in protection circuits: the Keeppower 5500mAh targets very powerful torches and DIY packs.

  • Capacity: 5500 mAh (min. 5400 mAh)
  • Protection: Built-in circuit (PCB)
  • Discharge: Up to 10A continuous
  • Cycles: Over 500
  • High-capacity 26650 format, reliable built-in protection
The Keeppower 26650 5500mAh is a premium rechargeable lithium-ion cell, in the 26650 format (larger than the 21700, for even higher capacity). As with all its models, Keeppower selects a quality cell and adds a built-in protection circuit against overcharge, deep discharge, over-current and short-circuit. With 5500 mAh (5400 mAh minimum), 3.6 to 3.7V and continuous discharge up to 10A, over 500 cycles, it is a solid choice for very powerful torches and demanding DIY packs.
The 26650 format confirms the reputation Keeppower already built with its 18650 and 21700 cells: a quality cell paired with a carefully engineered protection circuit. Tested in a search-light torch (very current-hungry), this cell holds up without flinching, with real capacity close to the guaranteed 5400 mAh minimum. Its larger size compared to the 21700 delivers even longer runtime, at the cost of extra bulk worth planning for (battery holder, torch body). The built-in protection remains a genuine everyday asset: a clean cut-off on short-circuit or over-deep discharge, without a second thought. The only caveats: it is a niche brand, less easy to find than a mass-market cell, and the 26650 format is rarer than 18650 or 21700, with a smaller range of compatible devices. For a very powerful torch or a DIY pack that needs capacity, it is an excellent base.
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K62 26650 (6200mAh) Vapcell K62 26650 high-drain cell 6200mAh
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Vapcell K62 26650 (6200mAh)

£10.29

The Vapcell K62: a 6200mAh 26650 cell built for high drain, 15A continuous, one of the most complete cells in the Vapcell range.

  • Capacity: 6200 mAh
  • Discharge: 15A continuous (35A peak)
  • Format: 26650, flat top, unprotected
  • Weight: 93.5g
  • 6200mAh and 15A: Vapcell's capacity/power sweet spot
The Vapcell K62 is a high-drain 26650 cell rated at 6200mAh, built for powerful torches and DIY battery packs. With 15A continuous discharge (35A peak) and internal resistance kept under 32mOhm, it combines runtime and output in a generously sized cell. Supplied as an unprotected flat top, it suits devices that manage their own discharge cut-off, or experienced users building their own packs.
We ran the Vapcell K62 in a high-end 26650 torch for several weeks of heavy use (night hikes, DIY jobs, a few bushcraft evenings). First takeaway: the rated 6200mAh capacity broadly holds up, with noticeably longer runtime than a standard 21700, and the torch never struggled to pull current on turbo modes. Voltage stays stable even under heavy load, a sign of genuinely well-controlled internal resistance for such a high-capacity cell. The 26650 format shows in the weight (93.5g), and it's worth checking your torch actually accepts this diameter before buying, not every tube does. One more thing to watch: this is an unprotected cell, reserved for devices that manage their own cut-off, and it must be charged only on a dedicated Li-ion charger. For anyone after a genuine capacity/power balance in 26650 without stepping up to the bulkier 32700 format, the K62 is a solid, honest choice, living up to the brand's reputation among high-drain cell enthusiasts.
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VI - 14500 batteries

The size of a standard AA battery, the 14500 (14 x 50 mm) delivers 3.7V instead of 1.5V, for compact torches and certain devices that can make use of it. Note that it is not interchangeable with a standard AA without checking first. Here is our selection:

NL1411R 14500 (1100mAh) Nitecore 14500 USB-C battery 1100 mAh
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Nitecore NL1411R 14500 (1100mAh)

£11.95 (2)

The Nitecore NL1411R pushes the 14500 format to 1100 mAh with a built-in USB-C port: a modern rechargeable alternative to AA cells in your compact torches.

  • Capacity / Voltage: 1100 mAh / 3.6V (3.96Wh)
  • Charging: Built-in USB-C, no external charger
  • Continuous discharge: 3A maximum
  • Type: Protected Button Top (14500)
  • 1100 mAh, the highest USB-rechargeable capacity in the format
The Nitecore NL1411R is a protected 14500 battery with 1100 mAh, one of the highest capacities in the format, with a built-in USB-C port that lets you recharge it without an external charger. AA-sized but delivering 3.6V instead of 1.5V, it powers compact torches designed for this format. Full protection (overcharge, over-discharge, short circuit) and a pressure relief valve included for reliable use.
Used in a small EDC torch designed for the 14500 format, the NL1411R clearly changes the game against a standard AA cell: the beam climbs noticeably in power, the difference is visible from the first switch-on. The built-in USB-C port is a genuine plus for this kind of format, often recharged in small quantities, no need to dig out a dedicated charger for a single cell. The rated 1100 mAh holds up for moderate daily use. The one thing to never forget: it does NOT replace an AA cell in a device not designed for 14500, at the risk of damaging it with its higher voltage, an easy mix-up given the similar size. For a compatible EDC torch, it's an excellent modern rechargeable alternative.
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14500 900mAh Soshine 14500 900mAh battery
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Soshine 14500 900mAh

The Soshine 14500 900mAh, a rechargeable 3.7V lithium battery in a compact AA size: ideal for torches, cameras and lithium-compatible devices.

  • Format / Voltage: 14500 (AA) / 3.7V
  • Capacity: 900mAh
  • Positive terminal: Button top
  • Pack size: Pack of 4 + case
  • AA-size 3.7V lithium cell for compatible devices
The Soshine 14500 900mAh is a rechargeable lithium-ion battery in the 14500 format, exactly the size of a standard AA cell, but delivering 3.7V instead of 1.5V. With 900mAh, a button top positive terminal and up to 1000 charge cycles, it suits compact torches, some cameras and flashes, and gadgets designed for 3.7V lithium cells. Note that it is not interchangeable with a standard AA battery without first checking device compatibility.
We tested this Soshine 14500 in a compact EDC torch, and an AA-sized cell running at 3.7V still feels a bit surprising the first time you hold it. Build quality is solid: the button top is clean, the nickel-plated steel contacts feel trustworthy, and the case included with the pack of 4 is handy for storage. In a torch with moderate draw, the rated 900mAh capacity holds up well, with a voltage that stays stable for most of the discharge. The real downside: the maximum discharge current looks fine on paper but feels a bit tight under heavy load, as confirmed by independent measurements found online. Not ideal for powering a very high-drain torch, then. One more thing to keep in mind, this is a bare cell with no built-in protection circuit: a dedicated charger and careful handling are essential. For reasonable use in a compact torch or small lithium device, it remains a solid, affordable choice from a well-known AA-format specialist.
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14500 950mAh Keeppower 14500 950mAh USB protected cell
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Keeppower 14500 950mAh

£6.79

A 14500 cell (AA-sized) that charges directly via micro-USB, no external charger needed: the Keeppower 950mAh, handy and protected.

  • Capacity: 950 mAh (min. 900 mAh)
  • Charging: Built-in micro-USB port
  • Protection: Built-in circuit (PCB)
  • Discharge: Up to 2A continuous
  • Direct micro-USB charging, no external charger needed
The Keeppower 14500 950mAh is a rechargeable lithium-ion cell in the 14500 format (AA-battery size), with a unique advantage: a built-in micro-USB charging port that lets you charge it without a dedicated external charger. It also carries a protection circuit against overcharge, deep discharge and short-circuit. With 950 mAh (900 mAh guaranteed minimum), a 3.6V nominal voltage and continuous discharge up to 2A, it is a handy choice for compact torches and small AA-format devices.
On a format as small as the 14500, this Keeppower cell's micro-USB function genuinely changes daily use: no more digging out a dedicated charger, a simple USB cable is enough to top it up, handy while travelling or hiking. Tested in a compact torch, it holds its rated capacity reliably, with decent runtime for such a small format. The built-in protection circuit brings welcome reassurance on a cell this size, trickier to handle bare: a clean cut-off on short-circuit or over-deep discharge. Discharge current stays modest (up to 2A), which limits its use to less power-hungry devices, not to be confused with an 18650 or 21700 built for high power. Another point worth knowing: this is not a classic AA battery you can swap in like-for-like, its 3.6V voltage is well above a AA's 1.5V, so check your device's compatibility first. For a compact torch or a small AA-format gadget, the convenience of USB charging clearly makes the difference.
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VII - CR123A and 16340 batteries

Long used in cameras, the CR123A battery has become very popular and now powers many devices and torches in particular. Called RCR123 if rechargeable, this battery, in 16340 format, is durable and practical. Here is our choice of CR123:

CR123 Duracell CR123A 3V lithium battery
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Duracell CR123

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A compact, enduring 3V lithium battery, resistant to extreme temperatures and storable for 10 years, ideal for tactical lights, alarms, sensors and cameras.

  • Voltage / Chemistry: 3.0V, lithium
  • Rechargeable: No (single-use)
  • Pack size: Pack of 2
  • Cold-resistant, 10-year storage, high density
The CR123A battery (also called CR17345) is a high-performance 3V lithium battery, very compact and known for its resistance to extreme temperatures, from severe cold to high heat. From Duracell, this single-use battery is ideal for demanding and security devices: tactical torches, alarms and detectors, surveillance cameras, rangefinders, sensors and cameras. Thanks to Duralock technology, Duracell guarantees storage for up to 10 years. Sold in a pack of 2.
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ARB-L16-800UP Fenix ARB-L16-800UP rechargeable 16340 USB-C battery
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Fenix ARB-L16-800UP

£11.95 (4)

A 16340 battery that recharges via its own built-in USB-C port, no external charger needed, RCR123A compatible: compact, protected and ready for your smallest lights.

  • Capacity / Voltage: 800 mAh / 3.6V
  • Rechargeable: Yes, via built-in USB-C (Lithium)
  • Pack size: Sold individually
  • Direct USB-C charging, CR123A/16340 compatible
Fenix brings its flashlight expertise to the 16340 format, the rechargeable equivalent of the CR123A cell. The ARB-L16-800UP is the newest version in the range, with a USB-C charging port built directly into the cell. With an 800mAh capacity, it recharges in about 2 hours and includes protection against overcharging, deep discharge, short circuits and overheating. Mind the voltage: 3.6V versus 3V for a disposable CR123A, worth checking before switching to rechargeable.
On a compact tactical light that normally runs through disposable CR123A cells, this ARB-L16-800UP was a real change: no more buying batteries every few outings, just a quick top-up over USB-C, and any phone charger does the job. The roughly 2-hour charge time Fenix quotes held up in practice, with an LED that switches from red to blue once it's done, handy for not second-guessing yourself. In the field, 800mAh is modest next to an 18650, which makes sense given the size, but it's plenty for an EDC light or a tactical sight used on and off. The one thing worth watching: some devices built strictly for disposable CR123A (3V) don't necessarily get on with this cell's 3.6V, so it's worth checking compatibility first. Once that's confirmed, it's hard to go back to disposables after getting used to the convenience.
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NL169R 16340 (950mAh) Nitecore RCR123A USB-C battery 950 mAh
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Nitecore NL169R 16340 (950mAh)

£11.95 (3)

The Nitecore NL169R combines the 16340/RCR123A format with a built-in USB-C port: 950 mAh to recharge anywhere, with no dedicated charger to carry.

  • Capacity / Voltage: 950 mAh / 3.6V (3.42Wh)
  • Charging: Built-in USB-C, no external charger
  • Continuous discharge: 2A maximum
  • Type: Protected Button Top (16340/RCR123A)
  • 950 mAh, the highest USB-rechargeable capacity in the format
The Nitecore NL169R is a protected 16340 (RCR123A) battery with 950 mAh, one of the highest capacities in the format, with a built-in USB-C port that lets you recharge it without an external charger. Built for compact torches, cameras and security devices that use CR123A cells, it packs full protection (overcharge, over-discharge, short circuit) and a pressure relief valve for reliable everyday use.
We slipped the NL169R into a small tactical torch and into an alarm unit tested outdoors: in both cases, the built-in USB-C port changed the game, no more carrying a tiny charger that's easy to lose. The rated 950 mAh holds up in real use, well above the 650 mAh of older versions of the same format. One thing to watch: its 3.6V voltage exceeds that of a standard CR123A (3V), and an old film camera tested with it didn't take kindly to the extra voltage, so it's worth checking compatibility before using it in older or sensitive gear. For a modern tactical torch or security device, though, it's a genuinely handy rechargeable cell for everyday use.
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VIII - Button cells

Button cells or flat batteries are no longer limited to their role as watch batteries. Widely used, especially in car key fobs or calculators, they come in various formats, including the famous CR2032 and LR44. We have chosen these for you:

CR2032 Button Cell Batteries (x6) Energizer CR2032 3V lithium button cell
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Energizer CR2032 Button Cell Batteries (x6)

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The most common button cell in the world: 3V lithium, found in watches, remotes, scales, sensors and on computer motherboards. Pack of 6.

  • Voltage: 3V (lithium)
  • Equivalence: CR2032 / DL2032 / BR2032 / SB-T15
  • Pack size: Pack of 6
  • The button cell standard, Energizer quality
The CR2032 is the most widespread 3V lithium button cell. Compact (20 mm diameter, 3.2 mm thick), it is everywhere: watches, calculators, car keys and remotes, scales, thermometers, toys, sensors, trackers and above all as the CMOS battery of computer motherboards. From Energizer, an industry benchmark, it is sold here in a pack of 6, ready to use and with a long shelf life.
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CR2025 batteries (x4) Duracell CR2025 lithium 3V coin cell
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Duracell CR2025 batteries (x4)

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The coin cell for car keys and watches: the Duracell CR2025 lithium 3V offers long life and child safety, in a pack of 4 ready to help out.

  • Voltage: 3V (lithium)
  • Equivalence: CR2025 / DL2025 / BR2025
  • Pack: Pack of 4
  • Safety: Child technology (Bitrex bitter taste)
  • The 3V coin cell for car keys and watches
CR2025 cells are 3-volt lithium coin cells, very common in small everyday devices. You find them in car keys (remotes), watches, calculators, scales, laser pointers and electronic boards. Thin and wide (20 mm diameter, 2.5 mm thick), the Duracell CR2025 matches the references DL2025 and BR2025. Sold in packs of 4, it offers long storage life and child-safety technology (Bitrex bitter taste) reducing ingestion risks.
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LR44 Batteries (x4) Duracell LR44 alkaline button cell
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Duracell LR44 Batteries (x4)

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The LR44 is one of the most widely used alkaline button cells in the world, in watches, calculators, toys and small remotes. Here is a pack of 4 Duracell cells.

  • Voltage: 1.5V (alkaline)
  • Equivalence: LR44 / AG13 / A76 / 76A / V13GA
  • Pack size: Pack of 4
  • The button cell standard, Duracell reliability
LR44 cells are among the most common alkaline button cells in the world. You find them in watches, calculators, toys, laser pointers, thermometers, digital calipers and small remotes. Very compact (11.6 mm diameter, 5.4 mm thick), this 1.5V alkaline cell from Duracell is equivalent to AG13, A76, 76A or V13GA references. Sold in a pack of 4, it offers the brand's recognised reliability.
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CR2016 batteries (x4) Duracell CR2016 lithium 3V coin cell
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Duracell CR2016 batteries (x4)

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The thinnest coin cell in its family: the Duracell CR2016 lithium 3V powers keys, watches and remotes, in a pack of 4 with child safety.

  • Voltage: 3V (lithium)
  • Equivalence: CR2016 / DL2016
  • Pack: Pack of 4
  • Safety: Child technology (Bitrex bitter taste)
  • The thinnest 3V coin cell, for keys and watches
CR2016 cells are 3-volt lithium coin cells, the thinnest in the CR20xx family. You find them in car keys, watches, remotes, electronic boards, calculators and small gadgets. With a 20 mm diameter and only 1.6 mm thick, the Duracell CR2016 matches the reference DL2016. Sold in packs of 4, it offers long storage and child-safety technology (Bitrex bitter taste) reducing ingestion risks.
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IX - Other batteries

CR2, A23, LR20, LR14? Alkaline, saline? Ni-MH, Lithium? 1.5V, 3V, 9V? Rechargeable, dry?
The choice in terms of batteries on the market is huge, and it is sometimes difficult to find your way around. Here is a sample of some excellent batteries that do not fit into any of the other sub-sections...

CR2 Batteries (x2) Duracell CR2 3V lithium battery
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Duracell CR2 Batteries (x2)

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A compact, enduring 3V lithium battery known for its high power, ideal for cameras, smoke detectors, lights and sensors, and storable for 10 years.

  • Voltage / Chemistry: 3.0V, lithium
  • Rechargeable: No (single-use)
  • Pack size: Pack of 2
  • High power, 10-year storage, cold-resistant
The CR2 battery (also called CR15H270) is a very popular 3V lithium battery, valued for its high energy density in a compact format. From Duracell, it is ideal for film and instant cameras, smoke detectors, torches, wireless locks and sensors, and golf rangefinders. Thanks to Duralock technology, Duracell guarantees storage for up to 10 years. Sold in a pack of 2.
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LR20 / D batteries (x4) Duracell Plus LR20 D alkaline battery
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Duracell LR20 / D batteries (x4)

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The largest of the cylindrical batteries: the Duracell Plus LR20 (D size) gives maximum runtime to powerful torches, site radios and big toys.

  • Voltage: 1.5V (alkaline)
  • Format: LR20 / D / MN1300
  • Pack: Pack of 4
  • Storage: Up to 10 years (Duralock)
  • The high-runtime D battery for power-hungry devices
Duracell Plus LR20 (D size) batteries are 1.5-volt alkaline batteries in the largest common cylindrical format. Their large volume gives them high capacity, ideal for very power-hungry devices: big torches, lanterns and floodlights, site radios, bulky toys, door chimes and some household devices. Sold in packs of 4, they offer up to 50% more runtime than the standard, with up to 10 years storage thanks to Duralock technology.
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LR14 / C batteries (x4) Duracell Plus LR14 C alkaline battery
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Duracell LR14 / C batteries (x4)

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The big cylindrical battery for power-hungry devices: the Duracell Plus LR14 (C size) powers torches, radios and toys with great runtime and up to 10 years storage.

  • Voltage: 1.5V (alkaline)
  • Format: LR14 / C / MN1400
  • Pack: Pack of 4
  • Storage: Up to 10 years (Duralock)
  • The long-lasting C battery for torches and radios
Duracell Plus LR14 (C size) batteries are 1.5-volt alkaline batteries in the medium cylindrical format, midway between AA and the large D. You find them in torches, portable radios, bulky toys, electronic musical instruments and various power-hungry devices. Sold in packs of 4, they offer up to 50% more runtime than the standard, and use Duralock technology that preserves their charge for up to 10 years in the packaging.
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MN21 (A23) Batteries (x2) Duracell MN21 / A23 12V battery (pack of 2)
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Duracell MN21 (A23) Batteries (x2)

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Need an A23 battery? Here is a pack of 2 Duracell MN21 cells, a very compact 12V alkaline battery, perfect for gate remotes, doorbells and car keys.

  • Capacity / Voltage: ≈ 55 mAh / 12V
  • Rechargeable: No (alkaline)
  • Pack size: Pack of 2
  • 12V in a miniature format, reliable and long shelf life
Did you know an A23 battery is actually made of 8 micro-cells stacked in a single casing? Called A23 by Energizer and MN21 by Duracell, it is a particularly compact 12 volt alkaline cell (28.5 mm long, 10.3 mm diameter). You find it in gate and garage remotes, car keys, wireless doorbells, alarm and keyless entry systems. Sold in a pack of 2, it offers Duracell reliability.
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9V batteries (x4) Duracell Plus 9V 6LR61 alkaline battery
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Duracell 9V batteries (x4)

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The battery that guards your safety: the Duracell Plus 9V powers your smoke detectors, multimeters and instruments, with brand reliability and up to 5 years storage.

  • Voltage: 9V (alkaline)
  • Format: 6LR61 / MN1604 (9V block)
  • Pack: Pack of 4
  • Storage: Up to 5 years (Duralock)
  • The benchmark 9V for smoke detectors and instruments
Duracell Plus 9V batteries are 9-volt alkaline batteries in the block format (6LR61 / MN1604), one of the most used for devices needing a high voltage in a small case. You find them in smoke detectors, multimeters, remotes, wireless microphones, measuring instruments and toys. Sold in packs of 4, they use Duralock technology that preserves their charge for up to 5 years in the packaging, plus Duracell's recognised reliability.
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X - Related questions

How do you choose rechargeable batteries? Available in several formats (LR6, LR14…), they fall into 2 categories, namely Nickel Cadmium (NiCd) and Nickel Metal Hydride (NiMH). NiMH batteries offer the advantage of being less toxic and having a longer battery life. Also check, when possible, the battery capacity (in mAh), which gives an idea of how long it will last.

The empirical way is to place the battery upright on a flat surface, like a table, then lift it a few centimetres and release it, to see if it bounces or not. Lighter, empty batteries will bounce where full ones will behave differently. However, there is a more scientific way to do this, which we recommend: using a battery tester.

Depending on the type of batteries you have, their charging time will vary. Overall, the more powerful a battery is, the longer it will take to fully recharge. Thus, for 4 standard 1.5-volt batteries, full charging can take up to 6 hours. Or half the time if you only charge 2, for example. Some chargers are faster, but quality batteries will be needed to avoid affecting their lifespan.

Where an AA alkaline battery is 1.5V, a rechargeable AA will be 1.2V. Electronic devices are tolerant at this level, often able to handle voltages of 0.9V. Alkaline batteries discharge in a constant, linear manner, whereas rechargeable cells keep their voltage for several hours before dropping rapidly at the end of discharge. Although different, therefore, 1.5V batteries and 1.2V rechargeable batteries are equivalent in use.

Need help choosing?

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