The Fenix ARB-L18-3500 is a high-capacity 18650 rechargeable Li-ion battery engineered for high-performance flashlights and tactical gear. Featuring a robust protection circuit built into the anode, it effectively guards against short circuits, overcharging, over-discharging, and overheating. For added safety, the battery is equipped with pressure relief vents to expel gases in the event of an internal short circuit. With a 3500mAh capacity and 500 charge cycles, this reliable battery ensures consistent power for your devices.