The COAST ZX965 ZITHION-X(TM) Li-Ion ported rechargeable battery is designed with an integrated USB-C allowing the convenience of your battery to be charged outside your light. All COAST ZITHION-X(TM) batteries include a built-in charge level indicator showcasing the battery's charge status (red) when charging, (green) when fully charged. Simply plug a USB-C cord into the battery port, connect the cord to an available power source, and charge. All COAST ZITHION-X(TM) batteries are protected with premium overcharge/discharge protection and are backed by COAST's one-year warranty.