Keep your light ready. Compatible with the GX20, HP8R, and A25R flashlights, the ZX750 ZITHION-X(TM) rechargeable lithium-ion battery features a built-in USB-C port for easy charging inside or outside the light. A battery charge indicator flashes red during charge-up and shines solid green when fully charged. The overcharge/discharge protection circuits make powering up as simple and safe as possible. COAST's one-year warranty backs the battery 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.