Abstract: This invention is an attachment for a standard storage battery attachment providing a liquid reservoir which is in communication with the individual cells of the battery for automatically maintaining a predetermined electrolytic level within the individual cells while simultaneously allowing gas buildup to be released. A valve is located between each cell and the reservoir, which valve opens and closes in response to the electrolytic level within the cell to automatically maintain the electrolyte at a predetermined level. The attachment is provided with a cover having one or more openings for adding liquid to the reservoir.