Abstract: The invention relates to a battery plug for closing battery cells. The plug is formed of an essentially cylindrical housing which is open at the bottom and which can be inserted into the opening of the cell. The housing has an upper opening which can be closed by a lid. The plug has a collector mechanism located in the area of this upper opening for receiving gases which have risen and condensed. The collector mechanism may consist of a labyrinth insert whose top is provided with holes and pins extending downwards from the top.

Abstract: A device that serves to automatically fill battery cells with water includes a filler plug that can be placed in the cell. The plug has two connection members for the water supply as well as a valve operated by a float. The valve body is connected in articulated fashion to the float, which is arranged centrally in the plug housing, via a pivotally mounted amplifying lever. Between the valve with the valve body and the connection member there is a substantially vertical overflow wall with a free upper edge that is higher than the horizontal upper edge of the bore of the connection members so that a U-shaped feed duct is formed that leads to the overflow wall.