Power up on your terms. Compatible with COAST Dual Power Penlights, G20 and G23 .The ZX1010 ZITHION-X™ rechargeable lithium ion battery features a built-in Micro USB 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.