Metabo LiHD batteries are compatible with all Metabo 18v power tools. The new performance batteries have been completely redeveloped from the older models. These batteries have been designed to provide maximum battery power and a long run time. Air cooled charging technology, permanent electronic single cell protection and processor controlled charge and discharge management help maintain the battery for a longer life. The charger can be used for all Li-Power compact, Li-Power plus and Li-Power extreme battery packs. Overcharging is now a thing of the past thanks to monitored charging techonology, the battery pack will be charged with constant monitoring of the voltage flow and charge will end as soon as the battery reached full charge.