Battery pack for supplying electrical construction elements, in particular heat elements

The pack (1) has a rechargeable battery unit comprising a rechargeable battery accommodated in a housing portion (2), and an electronic control unit for controlling a voltage and/or a current to be delivered by a terminal (4). The control unit comprises an electronics part accommodated in another housing portion (3), where the housing portions are releasably connected with one another in a holding position by a stop unit. Contacts arranged at the former housing portion comprise a conductive connection to contacts arranged at the latter housing portion in the holding position. The latter contacts are formed as sliding contacts.