LiHD battery packs for ultimate performance and extremely long use with minimal temperature development. Ultra-M technology provides intelligent battery management for long-lasting battery packs with a 3-year warranty. Patented air-cooled charging technology ensures efficient performance. Permanent electronic single cell monitoring (ESCP) during charging contributes to a particularly long service life. Processor-controlled charge and discharge management is included, along with a capacity display for continuous monitoring of the charge status. There is no memory effect, and the battery packs have a long shelf life with virtually no self-discharge.