The SureFire 18650B Battery (brand part no. SF18650B) is a high-performance 3.6-volt, 3,500 mAh lithium-ion rechargeable cell built for SureFire’s 18650-compatible flashlights and weapon lights, charging over a built-in micro-USB port with no separate charging cradle required. Two LED indicators on the battery display charge state, glowing red while charging and switching to green once fully charged, and the cell supports an 8-10A discharge rate for dependable performance in high-drain devices like SureFire’s brightest LED lights.

Key Specifications

• Rated at 3.6 volts with a 3,500 mAh capacity.
• Charges via a built-in micro-USB port, no separate cradle needed.
• Displays charge state with red (charging) and green (fully charged) LED indicators.
• Supports an 8-10A discharge rate for high-drain devices.
• Measures 2.73 in and is sold as a single pack.

Frequently Asked Questions

Does this battery need a separate charger? No, it charges through its own built-in micro-USB port.

How do I know when it is fully charged? The battery’s LED indicator turns green once charging is complete, and glows red while charging.

Buy the SureFire 18650B Rechargeable Battery

Keep your SureFire light powered and ready without hunting for a charging cradle. Order it from our SureFire lineup in our weapon lights selection, and our Lubbock, Texas team can help you confirm compatibility with your light.