Put the power in clear lighting. Compatible exclusively with the COAST A9R inspection pen light, the Z250 ZITHION(TM) rechargeable lithium ion battery recharges by quick connection to a corded cap that fits over the head of the pen light-creating a no-hassle, lightweight power solution. 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. All COAST ZITHION(TM) batteries are protected with premium overcharge/discharge protection and are backed by COAST'S one-year warranty.