High availability of the trak® air, trak® eco and trak® fnc battery systems is enhanced to maximum effect through use of trak® power premium charge. The high-frequency technology used here permits a compact design with optional wall mounting to save space. In combination with HOPPECKE BIM (Battery Identification Module), multi-capacity and multi-voltage capability is obtained. This means that different batteries with varying voltage and capacity may be charged by a single charging unit.