The fenix arb-l21-5000 li-ion rechargeable 21700 battery provides the voltage and power needed for extended runtime and higher lumen capacities.The arb-l21 includes protective circuits inside the anode and up to 500 charging cycles.Also included are the three sets of overheat protection: pressure relief, microporous, and ptc cathodal block.7.5a maximum current, charging current: 1a recommended, 5a maximum.*note- does not include an on-board usb port for direct charging

Rechargeable: Yes
Nominal Voltage: 3.6V
Rated Capacity Mah: 5000