Recharge and go. Compatible with COAST PX1R and TX1R flashlights, the ZX450 ZITHION-X(TM) rechargeable lithium ion battery sets you up to charge your battery either inside or outside of your light. The battery features a built-in Micro USB port, a battery charge indicator-which flashes red during charge-up and shines solid green when fully charged-and overcharge/discharge protection circuits to 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.