Abstract: A lead-acid battery capable of activation by the addition of electrolyte thereto includes at least one pack of formed positive and negative battery plates with insulating separators being interposed between adjacent plates. Part of the sulphuric acid used to form the plates is retained by the battery and has a specific gravity between 1.25 and 1.35, the amount of the retained acid being insufficient to electrically connect the plates during storage. In addition means is provided to seal the battery against ingress of air but allow gases generated in the battery to escape.

Abstract: A method of producing a lead-acid battery capable of activation by the addition of electrolyte thereto, comprises the steps of:starting with a battery container accommodating at least one pack of battery plate grids having insulating separators interposed between adjacent grids, each of said grids carrying the lead-acid battery paste required to produce a positive or a negative battery plate after conversion of the paste into the active material of the plate. With the grids immersed in an aqueous solution of sulphuric acid, an electric current is passed between the grids so that the solution rises to a temperature in excess of 180.degree. F. but not greater than 210.degree. F., the passage of the electric current converting the paste on the grids to the active material of the plates.