18.0V Li-Ion Battery, 4.0Ah Capacity

LiHD battery packs for ultimate performance and extremely long use with minimum temperature change. Ultra M technology: Intelligent battery management for long-lasting battery packs with a 3 year guarantee. Patented “AIR COOLED“ charging technology. Permanent electronic Electronic Single Cell Protection (ESCP) when charging, for particularly long life. Processor-controlled charge and discharge management.