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A lead acid battery having a glass fiber separator material is disclosed. The separator material is a mass of intermeshed glass fibers produced by suspending glass fibers in a gaseous medium, and collecting the suspended glass fibers on a foraminous material. The mass of fibers suspended in the gase

A lead acid battery having a glass fiber separator material is disclosed. The separator material is a mass of intermeshed glass fibers produced by suspending glass fibers in a gaseous medium, and collecting the suspended glass fibers on a foraminous material. The mass of fibers suspended in the gaseous medium has a BET surface area of from 0.2 to 5 m.sup.2 per gram. A battery having a glass fiber separator material with added cellulose fibrils is also disclosed, as is a battery having a glass fiber separator material with added particulate material such as silica.

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[ I claim:] [1.] In a storage battery comprising a plurality of lead plates in a closed case, a fibrous sheet plate separator between adjacent ones of said plates, and a body of a sulfuric acid electrolyte absorbed by each of said separators and maintained in contact with each of the adjacent ones o

[ I claim:] [1.] In a storage battery comprising a plurality of lead plates in a closed case, a fibrous sheet plate separator between adjacent ones of said plates, and a body of a sulfuric acid electrolyte absorbed by each of said separators and maintained in contact with each of the adjacent ones of said plates, the improvement wherein said separator sheets consist essentially of intermeshed glass fibers produced by suspending glass fibers in a gaseous medium, collecting the suspended glass fibers on a foraminous material, and separating the collected fibers from the foraminous material, with the proviso that the fibers suspended and collected have a BET surface area of from 0.2 to 5 m.sup.2 per gram.