A system comprising a primary unit (1) and a number of secondary units (16), which may be stored in receiving means in the primary cleaning unit (1) or be coupled to the primary unit. The primary and secondary units are configured as movable cleaning or gr...

A method and a system for controlling the charging and discharging of one or more battery packs (8) connected to a power source (7) or an apparatus (9) driven by the battery packs. The battery pack (8) comprises a number of battery cells connected to two o...