Storage battery

A storage battery adapted to be mounted in a compartment, preferably of an aircraft, wherein on one of the walls of a metal container with a plastic lid having a projection there is provided a plug member connectable to a mating plug means. The contact sockets of this plug member are hollow cylinders divided by longitudinal slots into sectors on the side of insertion of the mating plug member. The contact sockets are of a "floating" structure displaceable in any direction relative to the central axis thereof. The metal container has insulating strips secured to its bottom and to the lower portions of the longitudinal side walls and serving, together with the plastic lid, as electric insulation of the container from the compartment and as guides when this storage battery is being mounted in the compartment and automatically coupled to the electrical wiring system of the aircraft by engagement of the plug member with the mating plug member. In order to retain the storage battery in the compartment as the automatic coupling thereof to the electrical wiring system of the aircraft takes place, the metal container is provided with a projection in the lower portion of the lateral side wall carrying said plug member and with a pair of studs arranged on the longitudinal side walls.