This Metabo Basic-Set 685074000 includes three high-performance 18V LiHD 5.5 Ah battery packs and an ASC 145 "AIR COOLED" charger. Designed for ultimate performance and extremely long runtime, the LiHD technology ensures minimal temperature generation during operation. The battery packs feature patented "AIR COOLED" charging technology and permanent electronic single cell monitoring (ESCP) for extended service life. A processor-controlled charge and discharge management system, along with a capacity display, allows for continuous monitoring of the charge status. These battery packs offer long storage capacity with minimal self-discharge and are compatible with all 18V machines and chargers of the CAS (Cordless Alliance System) brands.