The SureFire SF18350 is a high-performance 3.7V lithium-ion rechargeable battery featuring convenient micro-USB charging capability and 1100 mAh capacity for extended runtime in demanding applications.SureFire SF18350 18350 format lithium-ion batteryBuilt-in micro-USB charging port - no charging cradle needed1100 mAh capacity for extended battery runtime8-10A discharge rate for high-drain LED flashlightsDual LED charge indicators (Red charging Green fully charged)Compatible with SureFire Dual Fuel single 123A productsCharges from any USB power source including wall chargers computers and power banksPerfect for tactical flashlights and high-performance LED devices this protected lithium-ion battery delivers reliable power with the convenience of universal USB charging capability.