Abstract: A storage battery has a battery housing which includes a rectangular casing with an open top end and a plurality of cell compartments, and a cover device sealed to the open top end of the casing. The cover device includes a main cover part and a sub-cover part. The main cover part has a plate body with a top face that is formed with a plurality of adjacent rectangular chambers. Each of the chambers is aligned with a respective one of the cell compartments and is confined by first and second longitudinal walls and first and second transverse walls. Each of the chambers has a bottom formed with a vent hole, a return hole, and an upwardly projecting partition unit that confines a condensate groove in the chamber. The sub-cover part is sealed to the main cover part at top edges of the longitudinal and transverse walls and the partition unit of each of the chambers to seal a top end of the condensate groove in each of the chambers.

Abstract: An improved stopper structure for a storage battery container according to the present invention is basically defined as a unit including a plurality of hollow stopper supports which comprise threaded support, a spongy rubber, and a rubber pad within each hollow stopper support. Each stopper support has a cylindrical shape with a hollow center to accomodate the abovementioned elements, respectively. The gas that evolves during battery operation is blocked by a stopper, additionally, the water vapor has no way to escape, therefore, the amount of battery fluid loss is reduced. At a time that the evolved gas within the hollow stopper support possesses enough pressure, the rubber pad will be forced to curve upwardly. As a result, the gas may be evolved along a slot provided across the bottom surface of a trough carrying the stopper supports.