The SureFire 18650 rechargeable battery (SureFire part no. SF18650B) is a protected 3.6-volt, 3,500 mAh lithium-ion cell with a micro-USB charging port built into it. Plug it into any USB power source with the included micro-USB cable, whether that is a wall charger, laptop, power bank or vehicle port, and it needs no charging cradle. Two LED indicators show red while it charges and green when it is full. It is built for high-drain use in the SureFire lights that take an 18650 cell.

Key Specifications

• Battery type is a protected 18650 lithium-ion cell, which adds circuitry that guards the cell in high-drain lights.
• Nominal voltage is 3.6 volts, matching the lights it is made for.
• Rated capacity is 3,500 mAh, or 3.5 Ah, which sets how long a light runs between charges.
• Stored energy is 12.6 watt-hours, a useful figure for comparing runtime with other cells.
• Discharge rate is 8 to 10 amps, the headroom a bright LED light needs.
• Charging is through a built-in micro-USB port, and a micro-USB to USB cable is included.
• Two charge-state LEDs show red while charging and green when charging is complete.
• Dimensions are 69.4 millimeters long by 18.6 millimeters in diameter, which is the standard 18650 form factor.
• Weight is 1.7 ounces, or 49 grams.
• It is sold as a single battery, so you can buy a second as a spare.

Frequently Asked Questions

Does it need a separate charger? No. It charges through its own micro-USB port using the included cable. SureFire notes that an external 18650 CC-CV cradle charger, not included, can also be used.

Which SureFire lights is it made for? SureFire lists the BSL-A Ballistic Shield Light, FURY-DFT, EDC2-DFT, FURY-IB-DF, M600DF, M640DF, M640DFT and P1R series as compatible products.

How long does a full charge take? SureFire states that charging through USB can take over 8 hours from fully depleted, and the two LEDs tell you when it is done.

Buy the SureFire Rechargeable 18650 Battery, 3,500 mAh, Micro-USB

Keeping a spare charged cell on the shelf is the simplest way to stay ready with a rechargeable light, and this one charges anywhere there is a USB port. Order it with our SureFire weapon lights from our Lubbock, Texas gun shop for fast shipping.