The Metabo Slide Li-POWER 18v 4AH Battery Packs provide the ultimate performance and extremely long application with minimal temperature generation. Intelligent battery management for long-lasting battery packs with a 3 year warranty Patented �AIR COOLED� charging technology Permanent Electronic Single Cell Protection (ESCP) when charging, for particularly long life. Processor-controlled charge and discharge management High storage capability with almost no self-discharge Capacity display with almost no self-discharge Many brands, one battery pack system: This battery pack is compatible with all 18 V machines and chargers of the CAS brands