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