Charge. Win. Repeat.
The SureFire SF18650B Battery is a protected lithium-ion rechargeable 18650 cell designed for compatible high-output SureFire Dual Fuel illumination tools.
Its integrated Micro-USB charging port allows the battery to be charged directly from a variety of USB power sources, including a USB wall charger, computer, laptop, power bank or automotive USB port. A compatible Micro-USB-to-USB cable is included, so no dedicated charging cradle is required.
The SF18650B can also be charged in a compatible external 18650 CC-CV cradle charger, which is sold separately and may provide faster charging if suitably equipped.
Two integrated LED indicators display the battery’s charging status. The red indicator illuminates while charging, and the green indicator confirms when the battery is fully charged.
With a rated capacity of 3,500 mAh, 12.6 Wh of energy and an 8–10A discharge rate, the SF18650B provides dependable performance in high-drain illumination tools such as compatible SureFire flashlights, WeaponLights and shield lights.
SKU / EAN Code
- SF18650B — 084871328050
Compatibility
The SF18650B is compatible with the following SureFire products:
- BSL-A Ballistic Shield Light
- FURY-DFT
- EDC2-DFT
- FURY-IB-DF
- M600DF
- M640DF
- M640DFT
- P1R Series
Always confirm that the specific illumination tool is approved for SF18650B rechargeable battery use before installation.
Charging Note
The SF18650B can be charged using:
- A USB wall charger
- A desktop or laptop computer
- A USB power bank
- An automotive USB port
- A compatible external 18650 CC-CV cradle charger
Charging through the integrated Micro-USB port can take more than eight hours when fully depleted. SureFire also lists approximately five hours from flashlight cutoff under its standard charging information.
Key Features
- High-performance 3.7V 18650 lithium-ion rechargeable battery with MICRO-USB port for ease of charging—no charging cradle needed
- When plugged into a power source, two LED indicators display the current charge state: Red for charging and Green for fully charged
- 3,500 mAh for extended battery runtime
- 8-10A discharge rate for dependability in high drain devices such as LED flashlights
- Can also be charged with a compatible external 18650 CC-CV cradle charger
- Micro-USB-to-USB charging cable included
Specifications
- Product Type: Protected rechargeable 18650 battery
- Battery Chemistry: Lithium-ion
- Nominal Voltage: 3.6 V
- Rated Capacity: 3.5 Ah / 3,500 mAh
- Energy: 12.6 Wh
- Charge End Voltage: 4.2 V
- Discharge End Voltage: 2.50 V
- Discharge Rate: 8–10 A
- Integrated Charging Port: Micro-USB
- USB Charge Voltage: 5.0 V ± 0.2 V
- USB Current: 600 mA ± 100 mA
- Charging Time: More than 8 hours if fully depleted
- Dimensions: 69.4 × 18.6 mm
- Charging Temperature Range: 0°C to 45°C
- Discharging Temperature Range: −20°C to +60°C
- Storage Temperature Range: 0°C to 35°C
- Lithium Content: 1.05 g
- Certifications: CE / PSE / UN38.3
- Weight: 1.7 oz (49 g)
- Charging Cable Included: Yes
- SKU: SF18650B
- EAN / UPC: 084871328050
Warranty
SureFire rechargeable batteries and chargers come with a two-year warranty from the date of purchase.

