The Fenix ARB-L16-800UP Built-in USB-C Rechargeable Battery is a 16340 Li-ion battery with a protection circuit in the anode to help prevent short circuits, overcharge/discharge and overheating. This battery has its own USB Type-C charging port for quick/easy charging without the need for a separate charger. The battery also includes multiple levels of protection including overcharge protection, overheat protection, and pressure relief vents which expel waste gas
