Valve-regulated lead-acid battery

摘要

A valve-regulated lead-acid battery produced by a so-called container formation method including preparing a battery from unformed positive and negative plates filling a predetermined dilute sulfuric acid into said battery, and then applying an electric current to said battery so that the group of plates is formed by container formation is provided. The valve-regulated lead-acid battery has an negative active material containing an oil incorporated therein. The amount of the oil to be incorporated is from 0.05 to 1% by weight. The oil may be a paraffinic oil, naphthenic oil, olefinic oil, aromatic oil or silicon-based oil.