Power tool batteries

On a tool battery it is not the amp-hours that decide the torque available, but the quality of the cells delivering them.

Two 18 V, 4 Ah packs can behave very differently under load: the one fitted with cells able to deliver high current will hold its speed through a wood screw, while the other sags in voltage and trips its protection. That is the criterion invisible on the packaging and yet the most decisive in use. The second point is compatibility: every manufacturer has its own system and locking, and third-party packs sometimes work but lose communication with the original charger. We state the cells used where the information is available, the capacity actually returned and the compatibility we observed.

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No product matches these criteria.

Our selection

Battery RB18L13 18V One+ Ryobi Battery RB18L13 18V One+
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Ryobi Battery RB18L13 18V One+

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Compatible with every tool in the Ryobi One+ range, this genuine RB18L13 battery offers a 4Ah capacity at 18V for constant, reliable power.

  • Capacity: 4 Ah / 72Wh
  • Voltage: 18V (Lithium+)
  • Compatibility: Ryobi One+ tool range
  • Constant power, fast charging, genuine Ryobi
The RB18L13 is a genuine Ryobi battery, compatible with every cordless tool in the One+ range (drills, drivers, saws, grinders and more). Thanks to Lithium+ technology, it provides constant power throughout the discharge, fast charging and an excellent lifespan. With a 4Ah capacity (72Wh) at 18V, it is equally suited to occasional DIY and more intensive use, and its 4-LED gauge shows the remaining charge at a glance.
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PXC 18V 4.0 Ah Battery Einhell Power X-Change 18V 4.0 Ah battery
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Einhell PXC 18V 4.0 Ah Battery

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The original 4 Ah pack that powers a drill, a lawnmower or a 230 V inverter alike, across a range of more than 300 machines.

  • Capacity: 4.0 Ah, meaning 72 Wh at 18 V
  • Technology: Lithium-ion, built-in battery management
  • Compatibility: The whole Power X-Change range
  • Display: 3-segment LED charge indicator
  • One battery for more than 300 machines
Power X-Change is the bet Einhell placed more than ten years ago: a single battery for the entire cordless range, from DIY to garden work. This 4.0 Ah reference is its most common format, the one that best balances runtime against weight. At 18 nominal volts it stores 72 watt-hours, enough to run a screwdriver for a good day, a mower over a small lawn, or a 230 V inverter for around twenty minutes at full load. A three-segment LED indicator shows the remaining level at the press of a button, and the internal electronics watch temperature and cell balancing to protect service life.
With close to seven thousand customer reviews, this battery is among the best sellers in its category, and it is easy to see why. The central argument is not technical but economic: as long as you stay with Einhell, one battery does everything. We have watched it move from a drill to a blower and then to a 230 V inverter in the same day, with no adapter and no improvising. On the 4 Ah format specifically, the balance is good. The 2 Ah packs run down too quickly on demanding tools, the 6 Ah ones noticeably weigh down a screwdriver held at arm's length; the 4 Ah sits in between, with 72 watt-hours for a little over six hundred grams. The three-segment LED indicator is basic, but it has the merit of existing and stops you running flat at the wrong moment. Two honest remarks, however. The stated capacity is measured under favourable conditions: on a tool that draws hard, expect closer to ninety per cent of the theoretical figure, which is normal for the sector. And the charger is never supplied with these batteries sold on their own, a detail that catches out hurried buyers: check you already have one, otherwise a starter kit works out cheaper than buying both separately. Beyond that, it is a reliable, thoroughly proven product, and the best ticket into an ecosystem that has grown a great deal.
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18V 5Ah compatible battery Bosch 18V 5Ah compatible battery
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Bosch 18V 5Ah compatible battery

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Replacement battery for Bosch Professional 18V cordless tools (GBA, BAT618, BAT620, GSR, GSB, GBH). Restore your device's original runtime when the battery gets tired.

  • Capacity: 5.0 Ah
  • Compatibility: Bosch Professional
  • Type: Li-ion 18V
  • Use: Replacement battery
  • Original runtime restored, Bosch Professional
This replacement battery compatible with Bosch Professional 18V cordless tools (GBA, BAT618, BAT620, GSR, GSB, GBH) lets you restore your device's original runtime when the fitted battery weakens. Capacity of 5.0 Ah. Check your original battery reference and the exact model of your device before buying to ensure compatibility.
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V8 Battery Dyson V8 SV10 vacuum battery 21.6V
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Dyson V8 Battery

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Give your vacuum its breath back: this 21.6V replacement battery restores the runtime and suction power of your tired Dyson V8.

  • Voltage: 21.6V
  • Capacity: High (~4600 mAh by version)
  • Compatibility: Dyson V8 (SV10)
  • Models: Absolute, Animal, Fluffy, Extra...
  • Restores original runtime and suction power
This replacement battery for the Dyson V8 vacuum (SV10 series) restores the runtime and suction power of a unit whose original battery is weakening. With a 21.6V voltage and a high capacity (around 4600 mAh depending on version), it is compatible with the Dyson V8 Absolute, Animal, Animal Pro, Fluffy, Extra and Allergy. It clips in place of the original battery, with no special tool for most models, and includes the necessary protections (overcharge, discharge, short-circuit). An economical way to extend your cordless vacuum's life instead of buying a new one.
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XR 18V 5Ah (DCB184) DeWalt DCB184 XR 18V 5Ah battery (DCB205 20V MAX)
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DeWalt XR 18V 5Ah (DCB184)

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The genuine runtime for your DeWalt tools: the XR 18V 5Ah battery (DCB184) powers the whole XR cordless range with a charge indicator and full compatibility.

  • Voltage: 18V XR (20V MAX)
  • Capacity: 5.0 Ah (Li-Ion)
  • Compatibility: Entire DeWalt XR 18V range
  • Indicator: 3-LED charge indicator
  • Genuine XR battery, 5 Ah for demanding tools
The DeWalt XR 18V 5Ah battery (reference DCB184, the European equivalent of the American DCB205 20V MAX) is the genuine Li-Ion battery of the XR 18V cordless platform. Its 5 Ah offers generous runtime for demanding tools (rotary hammers, grinders, saws). It has a 3-LED charge indicator and a management system protecting the cells. Fully compatible with all DeWalt XR 18V tools and chargers, it is the ideal spare battery.
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18V 5Ah compatible battery Makita 18V 5Ah compatible battery
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Makita 18V 5Ah compatible battery

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Replacement battery for Makita 18V LXT cordless tools (BL1850, BL1860, BL1830, BL1840). Restore your device's original runtime when the battery gets tired.

  • Capacity: 5.0 Ah
  • Compatibility: Makita
  • Type: Li-ion 18V
  • Use: Replacement battery
  • Original runtime restored, Makita
This replacement battery compatible with Makita 18V LXT cordless tools (BL1850, BL1860, BL1830, BL1840) lets you restore your device's original runtime when the fitted battery weakens. Capacity of 5.0 Ah. Check your original battery reference and the exact model of your device before buying to ensure compatibility.
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M18 Red Lithium 5.0Ah Milwaukee M18 B5 18V 5.0Ah battery
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Milwaukee M18 Red Lithium 5.0Ah

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The genuine power for your Milwaukee tools: the M18 Red Lithium 5.0Ah battery delivers 18V, an LED gauge and full compatibility with the entire M18 cordless range.

  • Voltage: 18V
  • Capacity: 5.0 Ah (Red Lithium-Ion)
  • Compatibility: Entire Milwaukee M18 range
  • Indicator: LED charge gauge
  • Genuine M18 battery, Red Lithium power and longevity
The Milwaukee M18 Red Lithium 5.0Ah battery (M18 B5) is the genuine 18V battery of the M18 cordless range. With its 5 Ah, it offers great runtime and steady power, ideal for demanding tools (rotary hammers, grinders, saws). Its Red Lithium-Ion technology delivers more torque, more runtime and better longevity than a standard lithium cell, including in cold weather. An LED charge gauge shows the remaining level, and it is compatible with all Milwaukee M18 tools.
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M365 Pro Battery Xiaomi M365 Pro 36V scooter battery
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Xiaomi M365 Pro Battery

189.99€

Give your scooter its range back: this 36V 12Ah battery with smart BMS restores up to 30 km on Xiaomi M365 and M365 Pro.

  • Voltage: 36V
  • Capacity: 12Ah (~12800 mAh)
  • Compatibility: Xiaomi M365 / M365 Pro
  • Management: BMS with communication
  • Up to 30 km of range, smart BMS
This replacement 36V 12Ah battery (around 12800 mAh) restores the original range of a Xiaomi M365 or M365 Pro electric scooter whose battery is tired. It integrates a BMS management system with communication function, which talks to the scooter to display the charge level correctly and protect the cells (overcharge, discharge, over-current, temperature). With wiring identical to the original, it fits with no modification and restores up to 30 km of range. An economical alternative to replacing the whole scooter.
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Related questions

Yes, within the same brand and the same mounting system: it is the same product. The 20 V figure is the no-load voltage, the 18 V is the nominal voltage under load, on five identical lithium cells. The 20 V badge is mainly a marketing argument, not a technical difference.

No, each maker imposes its own mounting rail and its own communication protocol. Adapters exist, but they disable the BMS thermal protection and current limiting. Choosing a brand therefore commits your whole tool collection, and that is the real criterion to weigh before the first purchase.

The amp-hour measures runtime, not power. A 5 Ah pack lasts two and a half times longer than a 2 Ah at the same voltage, but it does not drive screws harder. It also weighs twice as much. For a drill, 2 Ah is enough; for a saw or a grinder you need 4 to 5 Ah.

It is neither safe nor advisable. A tool battery needs a precise charge profile and a dialogue with the BMS to balance its cells. Improvised setups from a bench power supply cause overheating, swelling and fire risk. An original or certified compatible charger costs less than an incident.

Often because it has been stored flat or in the cold. A cell that drops below 2.5 V degrades irreversibly. Also check that the tool is not being forced: a blunt bit or a clogged blade triples consumption. Finally, a pack past 300 cycles has naturally lost 20 to 30 per cent of its runtime.

Cold storage is fine down to around -10 degrees, but charging below 0 degrees damages the cells. Bring the battery back to room temperature for an hour before putting it on the charger. Store it half charged, never full or empty, and top it up every three months.