Power up and shine bright. Compatible with the COAST TX14R flashlight, the ZX810 ZITHION-X(TM) rechargeable lithium ion battery features a built-in Micro USB port for easy charging either inside or 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.