Power up and keep at it. Compatible with a COAST XP40R flashlight, the ZX840 ZITHION-X™ 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. 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.