Charge up and keep working. Compatible with the COAST PS200/PS250, GX10 and GX15 flashlights, the ZX557 ZITHION-X™ rechargeable lithium-ion battery features a built-in USB-C port for easy charging. 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.