Abstract: A water-refill plug for automatically filling and refilling the cells of the battery has a housing forming a valve seat, and forming an upper and lower guides above and below the valve seat. A float is movable vertically in the housing below the seat in one of the cells of the battery. A valve body vertically movable independently of the float body has upper and lower end vertically slidable in the upper and lower guides. A magnetically attractable or repellable element or permanent magnet is provided on one of the bodies. Another permanent magnetic on the other of the bodies exerts a force via the element or magnet so the valve body is moved by the float body.

Abstract: The invention relates to a closure cover over at least one battery cell of an industrial battery, in particular of a drive battery, having two pole openings for passing the battery poles through and having an electrical load in or on the closure cover, wherein an electrical line is arranged on, under or in the closure cover between a first pole opening of one polarity and the electrical load and between a second pole opening of the other polarity and the electrical load in each case, the said electrical lines electrically connecting the poles of the battery cell to the electrical load in order to supply electrical energy to the electrical load, wherein the electrical lines have, as electrical conductors, an electrically conductive plastic.

Abstract: Water refilling plug for automatically filling and refilling the cells of a battery, comprising a valve body which is operated by a float and which closes the valve when the battery cell is full in order to terminate the refilling operation, wherein there is a permanent-magnet force between the valve body and the float, the movement of the float being transmitted to the valve body by said permanent-magnet force.

Abstract: A battery cap of a battery has a cap body adapted to cover the battery and formed with a gas-discharge port for gas generated in the battery. The body is formed with a gas-discharge passage opening laterally into the gas-discharge port, a gas-vent plug having an inner side exposed to gases in the battery and formed with a passage have an inner end at the inner side and an outer end either opening laterally outwardly into the gas-discharge passage in a predetermined angular position of the plug or opening outwardly into the exterior.