NOVELTY - A lead storage battery (1) is provided with battery case (2) in which electrodes and electrolytic solution are accommodated, and battery cover (3). The battery cover is equipped with liquid opening stopper (4), and metal oxide layer (5). The liquid opening stopper has an exhaust hole (4a) through-which oxygen and hydrogen gas are discharged. The metal oxide layer is an outer surface adjoined to exhaust hole, and contains emulsion of tin oxide, antimony oxide and polyolefin. The metal oxide layer of battery cover is contacted with negative electrode terminal (6).    USE - Lead storage battery.    ADVANTAGE - The lead storage battery is safe and economical, and has excellent water resistance and antistatic property. The damage due to discharge spark and internal ignition are prevented easily.    DETAILED DESCRIPTION - A lead storage battery is provided with a battery case in which electrodes and electrolytic solution are accommodated, and a battery cover which covers the opening portion of the battery case. The battery case contains synthetic resin such as olefin resin and acrylonitrile-butadiene-styrene resin. The battery cover is equipped with a liquid opening stopper, and a metal oxide layer. The liquid opening stopper has an exhaust hole through-which oxygen and hydrogen gas retained inside of the battery is discharged to exterior. The metal oxide layer is an outer surface adjoined to exhaust hole of the battery cover, and contains emulsion of tin oxide, antimony oxide and polyolefin. The metal oxide layer of battery cover is contacted with negative electrode terminal provided in the lid. The metal oxide layer is formed by coating aqueous solution containing tin oxide, antimony oxide and polyolefin in outer surface of battery cover.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of lead storage battery.    Lead storage battery (1)    Battery case (2)    Battery cover (3)    Liquid opening stopper (4)    Exhaust hole (4a)    Metal oxide layer (5)    Negative electrode terminal (6)