Battery chargers for AA, AAA and 18650

A good cell charger does more than recharge: it tells you what each cell is worth, and refuses the ones that have become dangerous.

Entry-level models send the same current to every bay and stop on a timer. Good chargers drive each bay independently, detect the chemistry, end the charge on the proper termination criterion, and display both the capacity actually returned and the internal resistance. That last figure is the most useful measurement for sorting a batch of cells: one whose internal resistance has doubled runs hot, sags under load and needs to leave the fleet. For each charger we give the real current per bay, the accuracy of the display and the protections genuinely present.

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Our selection

IntelliCharger i2 Charger Nitecore IntelliCharger i2 battery charger
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Nitecore IntelliCharger i2 Charger

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A rugged, versatile charger that charges two cells at once, even of different types, from 18650 Li-ion to AA NiMH, with automatic chemistry detection.

  • Charge: 1000 mA max (500 mA on 2 bays)
  • Bays: 2 independent bays
  • Compatibility: Li-ion/IMR (18650, 26650...) + NiMH/NiCd (AA, AAA, D)
  • Auto chemistry detection, rugged, mains or 12V
The Nitecore IntelliCharger i2 is a universal charger that recharges two cells simultaneously, even of different types or sizes. It automatically detects the chemistry (Li-ion/IMR or NiMH/NiCd) and adapts the charge. It accepts a wide range of formats: Li-ion 26650, 22650, 18650, 18350, 17670, 14500, 10440, 16340/RCR123, plus NiMH/NiCd AA, AAA, AAAA and D cells. Simple, safe and tough, it runs on mains or a 12V car socket. Ideal for users of torches and 18650 cells.
The Nitecore IntelliCharger i2 is certainly not the newest or most sophisticated battery charger, but after testing more than 10 chargers of different brands and formats, our team kept this one for its simplicity and durability. It recharges the most common rechargeable formats without any trouble. Extremely solid and long-lasting (we have been using one at the office almost daily since 2014, and it still works without a hitch despite several drops). Protected against overheating and reverse polarity, it stops automatically when the cell is charged or after 10 hours of charging. We also appreciate that it can be powered via a car cigarette-lighter cable, which makes it even more versatile. In short, it only has small LEDs to show charging progress rather than a fancy LCD screen, it is rather rustic, but it is far better and less temperamental than most mains chargers on the market.
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UC Magnetic USB Charger Olight UC Magnetic USB Charger
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Olight UC Magnetic USB Charger

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Particularly clever, this small charger from Olight is able to recharge almost any cylindrical battery, via USB.

  • Charge: 750mA via USB
  • Slot: Charges a single battery at a time
  • Compatibility: Lithium IMR/Li-ion, Nickel (Ni-MH/Ni-Cd)
  • Ultra compact, universal (charges more than 30 battery types)
This minimalist battery charger was designed by Olight (a brand specializing in flashlights and torches). Powered via USB, it is able to charge a very wide range of different batteries and cells, as long as they are Lithium or NiMH/NiCD type and cylindrical in shape, with a current of 750mA. Shaped like a Y, it has a USB plug on one end, and on the other, 2 magnetic tips that attach to your battery's two poles thanks to two magnets.
Since the launch of this small battery charger, several brands have released a magnetic charger with a similar design. We've had the chance to test 4 others, and none is as good and versatile as the one from Olight. Nothing beats the original, then. Able to charge almost any cylindrical battery, this smart charger detects the battery's technology and charges it accordingly. Basically, it can charge any cylindrical lithium battery with a voltage of 3.6V/3.7V and any cylindrical NiMh cell with a voltage of 1.2V/1.5V. It's hard to get more versatile than this tiny device, which will find its place anywhere thanks to its feather-light weight of 20.5g, for example in an EDC kit or a Bug Out Bag. One of the best chargers on the market, and one of the Best Batteries team's favorites! (Would have scored 5/5 if several colors had been offered.)
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LCD Smart Charger+ Varta LCD Smart Charger+
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Varta LCD Smart Charger+

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One of the most popular battery chargers: clear LCD screen, handy USB power and 4 AA cells included. The good all-round compromise.

  • Formats: AA/AAA (NiMH)
  • Screen: LCD (state, time left)
  • Input: USB, 4 slots
  • Included: 4 AA 2100mAh cells
  • LCD screen and USB charging, 4 cells included
The Varta LCD Smart Charger+ is a very widespread smart charger for AA and AAA NiMH rechargeable batteries. It charges up to 4 cells with individual management of each slot, and its LCD screen clearly shows charge state and remaining time, cell by cell. Powered by a USB cable, it plugs into a mains socket, a computer or a power bank. Automatic detection and protections ensure safe charging. Supplied with 4 Varta AA 2100mAh cells, it is a versatile, readable set, one of the best-sellers on the market.
It is the charger you see everywhere, and in use you understand why: the LCD screen is genuinely pleasant, you see at a glance where each cell stands and how much time is left, no more guessing. The USB power is well thought out, we even used it on a power bank over a weekend. Individual charging lets you mix AA and AAA without trouble. The 4 supplied cells help you get started. Let us be honest about the limits: charging is not the fastest, and some of the included cells age less well than premium eneloop. Its rating reflects this mass popularity with varied expectations. But for versatile family use, with a clear screen and the flexibility of USB, it does the job very well at a reasonable price.
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UMS4 Charger Nitecore UMS4 4-slot LCD battery charger
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Nitecore UMS4 Charger

33.68€ (20)

The four-bay big brother of the UM2: the Nitecore UMS4 charges four cells at once over USB, up to 3A per bay, with a large and very complete LCD screen.

  • Bays: 4 independent bays
  • Charging: USB QC input, up to 3A per bay (4A total)
  • Display: LCD: voltage, current, capacity, health
  • Compatibility: Li-ion 10440 to 26650 + NiMH AA/AAA
  • Four cells at once with detailed LCD monitoring
The Nitecore UMS4 is a smart four-bay charger that plugs in over USB. With a Quick Charge adapter, it delivers up to 3A on a single bay, or 4A shared across the four. Its large LCD screen shows the voltage, current, charged capacity, cell type and health of each cell in real time. It automatically detects the chemistry and accepts a wide range of formats: Li-ion/IMR/LiFePO4 from 10440 to 26650 (18650, 20700, 21700...) plus NiMH AA and AAA batteries. The reference for charging and monitoring several cells at once.
The UMS4 is the charger we keep on the bench when juggling a lot of cells. Four bays, a large and very complete LCD screen that shows, for each cell, voltage, current, charged capacity, type and health, and fast charging that reaches up to 3A on one bay with a Quick Charge adapter. It swallows the 18650, 21700 and 26650 cells of flashlights without complaint, and also takes AA and AAA NiMH. We like its simplicity: one USB source, and everything reads at a glance. Two honest reservations: you need a good QC adapter to get the full 4A total, and there is no clean cut-off without unplugging. But for charging and monitoring four cells at once, it remains a safe bet.
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VC4 XTAR VC4 battery charger with LCD screen
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XTAR VC4

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A charger that tells you everything: the XTAR VC4 charges 4 Li-ion or Ni-MH cells at once and shows voltage, current and capacity on its LCD screen. The reference for cell enthusiasts.

  • Slots: 4 (independent)
  • Compatibility: Li-ion and Ni-MH (18650, AA, AAA...)
  • Display: LCD screen (voltage, current, capacity)
  • Power: USB
  • 4 cells at once with informative LCD screen
The XTAR VC4 is a smart 4-slot charger, compatible with rechargeable Li-ion and Ni-MH cells in many formats (18650, 26650, 21700, AA, AAA...). Its LCD screen shows in real time the voltage, current, capacity and status of each cell, making it a valuable tool to monitor and maintain your batteries. It charges each slot independently, stops automatically at full charge and can revive deeply discharged cells. USB-powered, it is a versatile, reliable charger, popular with torch users, vapers and electronics enthusiasts.
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Powerline 5 Pro charger Ansmann Powerline 5 Pro charger
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Ansmann Powerline 5 Pro charger

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The charging and reconditioning station for enthusiasts: all formats (AA to D, 9V), LCD screen and test, discharge and refresh programs to maintain your batteries.

  • Formats: AA/AAA/C/D and 9V
  • Screen: LCD, adjustable current
  • Functions: Charge, discharge, test, refresh
  • Slots: Individual charging
  • Multi-format maintenance station with LCD
The Ansmann Powerline 5 Pro is a premium charger and a true maintenance station for NiMH and NiCd batteries. It accepts all round battery formats (AA, AAA, C, D) as well as 9V blocks, and manages each slot individually. Its LCD screen shows each battery's state, and its four programs (charge, discharge, capacity test, refresh) let you maintain and revive tired cells. The charge current is adjustable. It is the ideal tool for photographers, DIYers and enthusiasts who want to get the most from their batteries.
For anyone who takes rechargeable batteries seriously, the Powerline 5 Pro is a little gem. We put it to the test with a stock of AA and AAA cells of various ages, and the capacity test function identified those ready for retirement, while the refresh program revived several we thought were dead. Being able to charge D and 9V on the same device is real comfort when you have varied needs. The LCD screen is readable and finally gives concrete figures. Two caveats: it is noticeably pricier and bulkier than a simple charger, and getting to grips with the programs needs a glance at the manual. But to maintain a fleet of cells over time, it is an investment that quickly pays off.
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VC8 Charger Xtar VC8 8-bay LCD battery charger
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Xtar VC8 Charger

36.00€ (14)

Eight cells at once: the Xtar VC8 charges, tests and grades up to eight 18650 or 21700 cells over USB-C, with a large and very detailed LCD screen.

  • Bays: 8 independent bays
  • Charging: USB-C QC3.0, up to 3A (1 cell)
  • Display: LCD: voltage, current, capacity, resistance
  • Functions: Charge, capacity test, grading
  • Eight cells at once with detailed analysis
The Xtar VC8 is a smart eight-bay charger for large sets of cells. It recharges over USB-C with QC3.0 fast charging and delivers up to 3A on a single bay, with five selectable currents (0.25 to 3A). Its large LCD screen shows the voltage, current, capacity and internal resistance of each cell, and offers capacity-test and grading functions. It accepts Li-ion cells from 10440 to 26650 (18650, 20700, 21700...) plus NiMH AA, AAA and C batteries. The reference for charging and analysing many cells.
The VC8 is the charger for heavy cell users: eight bays, enough to recharge a whole set of 18650 and 21700 cells at once, without multiplying chargers. We like its large LCD screen, which shows, for each cell, voltage, current, capacity and internal resistance, plus a capacity-test and grading function, valuable for sorting cells by health. USB-C power and the choice of five currents (0.25 to 3A) make it versatile, nursing small cells or speeding up big ones. Two honest reservations: with eight bays it is logically bulky on a desk, and to get the full 3A you need a good QC adapter. But for charging and above all analysing many cells, it has few rivals at this price.
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ReCyko AR02 charger GP ReCyko AR02 charger
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GP ReCyko AR02 charger

9.99€ (11)

The clever entry-level charger: simple, compact and affordable, supplied with 2 ReCyko AA cells ready to use. Perfect to start with rechargeables.

  • Formats: AA/AAA (NiMH)
  • Slots: 2 to 4
  • Included: 2 ReCyko AA 2000mAh cells
  • Safety: Built-in protection
  • Simple, affordable charger, 2 cells included
The GP ReCyko AR02 is an entry-level charger for AA and AAA NiMH rechargeable batteries. Simple and compact, it charges 2 or 4 batteries and plugs straight into the mains. It comes with 2 GP ReCyko AA 2000mAh cells already pre-charged, ready to use out of the box. With no screen or advanced functions, it focuses on the essentials: recharging your batteries simply and safely, at a low price. It is the ideal starting point to leave disposable batteries behind without breaking the bank.
We are not going to snub this little GP: for under 10€ with two cells inside, it does the job without fuss. You plug it in, insert the batteries, the light comes on, and a few hours later everything is charged. The supplied ReCyko are stunning in shelf life, we found them nearly full in a controller after a whole summer. It is the charger we recommend without hesitation to someone still hesitating to switch to rechargeables. Of course, do not expect miracles: no screen, no fine individual charging, no test function. For serious use or a large fleet of cells, you will move up a range. But as a first charger or a backup, the value is unbeatable.
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Eneloop BQ-CC55 charger Panasonic Eneloop BQ-CC55 charger
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Panasonic Eneloop BQ-CC55 charger

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The reference smart charger for AA and AAA NiMH batteries: per-slot charging, automatic detection and 4 eneloop batteries included.

  • Formats: AA/AAA (NiMH)
  • Slots: 4, individual charging
  • Charge: Fast, ~3h for 4 AA
  • Safety: Detection, overcharge protection
  • Smart per-slot charging, 4 eneloop included
The Panasonic Eneloop BQ-CC55 is a smart charger for AA and AAA NiMH rechargeable batteries. It charges up to 4 batteries at once, with individual management of each slot: each cell is charged then monitored separately, which preserves their lifespan. Automatic detection and overcharge and overheat protections ensure safe charging. Fast (about 3 hours for 4 AA), compact and supplied with 4 eneloop 2000mAh batteries, it is the safe bet to equip the whole home.
We adopted it and we are not going back: this little Panasonic replaced all our disposable batteries. Per-slot individual charging really changes things, you can mix two AA and one AAA without a second thought, and each cell is treated according to its state. The supplied eneloop live up to their promise, you find them charged even after months in a drawer. Compact, quiet, it barely warms up. The only real complaint: no screen, just LEDs, so no precise info on capacity or remaining time, which is enough for home use but will frustrate enthusiasts. At this price, with 4 eneloop included, it is the best starting point to switch to rechargeable batteries.
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VC4SL Charger Xtar VC4SL 4-bay USB-C battery charger
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Xtar VC4SL Charger

28.23€ (10)

A four-bay charger with an LCD screen and USB-C: the Xtar VC4SL shows voltage, current, capacity and internal resistance, and charges at up to 3A on one bay.

  • Bays: 4 independent bays
  • Charging: USB-C QC3.0, up to 3A (1 cell)
  • Display: LCD: voltage, current, capacity, resistance
  • Compatibility: Li-ion 10440 to 32650 + NiMH AA/AAA
  • Real-capacity and internal-resistance test
The Xtar VC4SL is a smart four-bay charger for Li-ion cells and NiMH batteries. It recharges over USB-C with QC3.0 fast charging and delivers up to 3A on a single bay, with a current selectable from 0.25 to 3A. Its LCD screen shows the voltage, current, capacity and internal resistance of each cell in real time. It accepts a very wide range of formats, from 10440 to 32650, including protected 18650 and 21700 cells, and even measures the real capacity of a cell. A complete workbench charger for flashlight enthusiasts.
The VC4SL is the charger we recommend when you want a versatile, readable model without stepping up to a high-end analysing charger. Its four bays swallow 18650 and 21700 cells just as happily as AA and AAA NiMH, and the LCD screen finally gives you useful data: voltage, real current, charged capacity and, above all, internal resistance, handy for spotting a tired cell. USB-C power is a real plus, you plug it into any phone charger, power bank or car socket. You pick the charging current, from 0.25 to 3A, to nurse small cells or speed up big ones. Two honest downsides: it is a little bulkier than average, and at this price a better-finished cable would have been welcome. But for charging and monitoring your cells day to day, it does a flawless job.
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UM2 Charger Nitecore UM2 LCD dual-slot battery charger
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Nitecore UM2 Charger

17.90€ (9)

A compact two-bay charger with a large LCD screen: the Nitecore UM2 recharges over USB at up to 3A and shows voltage, current, capacity and health for each cell.

  • Bays: 2 independent bays
  • Charging: USB QC input, up to 3A (1 cell)
  • Display: LCD: voltage, current, capacity, health
  • Compatibility: Li-ion 10440 to 26650 + NiMH AA/AAA
  • Large LCD screen and automatic detection
The Nitecore UM2 is a smart two-bay charger that plugs in over USB. With a Quick Charge adapter, it reaches up to 3A on a single bay, or 1.5A per bay when both are used. Its large LCD screen shows the voltage, current, charged capacity, cell type and health in real time. It automatically detects the chemistry and accepts a wide range of formats: Li-ion/IMR/LiFePO4 from 10440 to 26650 (18650, 20700, 21700...) plus NiMH AA and AAA batteries. Simple, complete and affordable.
The Nitecore UM2 is the two-bay charger we drop into the bag when we want something serious without the bulk. Two bays, a large and very complete LCD screen that shows voltage, current, charged capacity, cell type and even health, and fast charging that, with a Quick Charge adapter, reaches up to 3A on a single bay. It swallows 18650, 20700, 21700 and 26650 cells without straining their wraps, and also takes AA and AAA NiMH. We like its simplicity: plug in over USB and read everything at a glance. Two honest reservations: you need a Quick Charge adapter to get full speed, and there is no clean shut-off without unplugging. But for monitoring and recharging your cells day to day, at this price, it is hard to fault.
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SC1 Plus Charger Xtar SC1 Plus 18650/21700 charger and pocket power bank
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Xtar SC1 Plus Charger

12.99€ (4)

The smallest of the two-in-ones: the Xtar SC1 Plus charges an 18650-to-26800 cell over fast USB-C and turns it into a 10 W pocket power bank, for just 47 g.

  • Slot: 1 slot (18650 to 26800)
  • Charging: USB-C QC/PD, up to 3A
  • Power bank: 10 W USB output (cell not included)
  • Weight: 47 g
  • Pocket charger + power bank, pass-through
The Xtar SC1 Plus is a pocket single-slot charger that also works as a power bank. Insert a cylindrical cell (18650, 21700, 26650 up to 26800), recharge it over USB-C with QC/PD fast charging up to 3A, then draw the energy out over the USB port to top up a phone (10 W output). It handles pass-through, also accepts D-size NiMH cells, and weighs a mere 47 g. Supplied with a silicone strap, it is the ideal minimalist accessory to slip into a pocket or a bag.
The SC1 Plus is a nugget of minimalist ingenuity: a single-slot charger that fits in the palm and doubles as a power bank. Slide in a cell, recharge fast over USB-C (up to 3A with a QC/PD adapter), then draw the energy out over the USB port to top up a phone. At 47 g, it is the perfect object to forget at the bottom of a bag or a first-aid kit. We like the pass-through, the compatibility up to the big 26800 and the silicone strap. Two honest reservations: the output caps at 10 W, enough for a smartphone but slow for a big need, and capacity depends entirely on the cell you insert (not included). For a flashlight user who wants a charger and a backup battery in the smallest possible form, it is an excellent buy at a tiny price.
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PB2SL V2 Charger Xtar PB2SL V2 18650/21700 charger and power bank
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Xtar PB2SL V2 Charger

25.68€ (3)

A two-cell charger and a power bank at once: the Xtar PB2SL V2 recharges your 18650/21700 cells and turns them into a power bank up to 22.5 W, screen included.

  • Slots: 2 slots (18650/21700)
  • Dual function: Charger + power bank (cells not included)
  • Charging: USB-C QC/PD, 2A per slot
  • Output: USB-C + USB-A up to 22.5 W
  • Revives cells from 0V, modular capacity
The Xtar PB2SL V2 is a clever two-in-one: a dual-slot charger for 18650 and 21700 cells, and a power bank that uses those same cells. Insert two cells, recharge over USB-C (QC/PD), then draw the energy back out over USB-C or USB-A at up to 22.5 W to top up a smartphone. Its power-bank capacity depends on the cells you choose, a handy modular system. A small screen shows the charge state, and a 0V activation function revives deeply discharged cells. Compact and versatile, ideal for travel.
The PB2SL V2 is one of those clever accessories you adopt quickly when you already live with 18650 or 21700 cells. The idea is simple: a dual-slot charger that also works as a power bank, reusing the cells you put in it. You recharge over fast USB-C, then draw the energy out over USB-C or USB-A at up to 22.5 W, plenty for a smartphone. The big advantage is modularity: capacity depends on the cells, and you replace worn ones instead of throwing away the whole bank. The screen is clear, and the 0V activation function has saved more than one deeply discharged cell that other chargers refused. Two reservations: the cells are not included, so you need good ones, and the 22.5 W output suits smartphones but not a laptop. For a flashlight or vaping user, it is a very handy travel companion.
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Related questions

The marking is always printed on the cell body: rechargeable, NiMH or Ni-MH, along with a capacity in mAh. A disposable cell instead reads alkaline, lithium or zinc-carbon, with no capacity given. Voltage helps too: a NiMH rechargeable shows 1.2 V against 1.5 V for an alkaline.

No, unless they explicitly say rechargeable. A standard alkaline placed in a charger heats up, swells and may leak or burst, because its chemistry is not designed to reverse the reaction. Only the rare RAM alkalines, sold with their own dedicated charger, are an exception.

Three signs are conclusive: the charger reports a fault or refuses to start the cycle, the cell heats abnormally during charging, or it drains in a few days without being used. An analysing charger measures real capacity: below 70 per cent of the nominal figure, the cell has reached the end of its life.

A standard NiMH charger handles AA, AAA, C and D formats at 1.2 V. Lithium cells such as 18650, 21700 or 14500 run at 3.6 to 3.7 V and require a lithium charger, never a NiMH one. Universal models detect the chemistry automatically, which avoids the most dangerous mistake in this field.

The numbers give the dimensions: 18 mm diameter by 65 mm long, against 21 by 70. The 21700 stores 4,000 to 5,000 mAh against 2,500 to 3,500 for an 18650, and delivers more current. Always check that your device accepts the greater length before switching format.

No, that reflex is inherited from old NiCd cells and their memory effect. Modern NiMH and lithium cells do not suffer from it, and deep discharges actually wear them out faster. Recharge when you need to, and simply avoid leaving a cell at zero for weeks.