Specifically designed for compatibility with the COAST CH1000R Headlamp and FLX10R Headlamp, the ZX355 ZITHION-X(TM) rechargeable lithium-ion battery features a built-in USB-C port for easy charging, whether inside the light or on its own. An integrated LED indicator flashes red while charging and glows solid green when fully charged, so you always know your power status. Overcharge and discharge protection circuits ensure safe, reliable performance. Backed by the COAST one-year warranty against defects in materials and workmanship. Compatible with CH1000R & FLX10R Headlamp.