The Metabo ASC 55 Air Cooled Slide Charger charges all Li-Power Compact Li-Power Plus Li-Power Extreme and LiHD slide-on battery packs 12-36V Monitors charging via a microcontroller and delivers acurate battery diagnosis The charger switches to compensation charge to conserve the capacity the battery pack is charged for 1 second every 45 seconds with 25 ampere With a AIR COOLED function the patented principle is based on air-cooling the battery pack during the charging process The battery packs are gently cooled down to the required charging temperature and then during the charging process are constantly maintained at optimum temperature With this principle a higher tool life of the battery packs and up to 30 shorter total charging time can be achieved