LiHD battery packs for ultimate performance and extremely long application with minimal temperature generation Ultra M technology: Intelligent battery management for long-lasting battery packs with a 3 year guarantee Patented “AIR COOLED“ charging technology Permanent Electronic Single Cell Protection (ESCP) when charging, for particularly long life. Processor-controlled charge and discharge management Capacity display with almost no self-discharge No memory effect Capacity display with almost no self-discharge