Power up and keep at it. Compatible with COAST HX5 and HP1 flashlights, the ZX210 ZITHION-X(TM) rechargeable lithium ion battery features a built-in USB-C port for easy charging outside the light. A battery charge indicator flashes red during charge-up and shines solid green when fully charged, and the overcharge/discharge protection circuits make powering up as simple and safe as possible. The battery is backed by COAST's one-year warranty against defects in materials and workmanship. All COAST ZITHION-X(TM) batteries are protected with premium overcharge/discharge protection and are backed by COAST's one-year warranty.