SureFire SF18650B 3.6V 3500mAh Micro-USB Rechargeable Battery

The SureFire SF18650B is a protected 18650 lithium-ion rechargeable battery with integrated Micro-USB charging for convenient field and everyday use. It provides a nominal voltage of 3.6 volts and a rated capacity of 3,500 mAh for extended runtime in high-drain devices. When charging the battery via USB the two onboard LEDs indicate status: red while charging and green when fully charged.

Key Specifications

• The nominal voltage is 3.6 V.
• The rated capacity is 3,500 mAh.
• The battery is a protected 18650 cell with integrated safety circuitry.
• Charging uses the Micro-USB port and includes a Micro-USB to USB cable.
• LED indicators display Red for charging and Green for fully charged.
• The typical USB charge current is 600 mA ±100 mA.
• The USB charge voltage is 5.0 V ±0.2 V.
• The discharge capability is 8–10 A for reliable performance in high-drain devices.
• Physical dimensions are 2.73 inches length by 0.73 inches diameter and the weight is 1.70 oz.

The SF18650B combines protected 18650 performance with the convenience of onboard Micro-USB charging and visible charge-state LEDs, making it a practical power solution for compatible flashlights and other portable electronics. Its high-capacity 3,500 mAh cell and robust discharge rating support extended runtime in demanding applications while the integrated charging port reduces the need for external cradles or specialty chargers.