LEAD STORAGE BATTERY

Provided is a fluid type lead acid battery wherein charging is performed intermittently for a short duration each time, and high-rate discharging to a load is performed in a partial state of charge, said lead acid battery improving the charge acceptance and the life characteristic under PSOC relative to the prior art. A positive plate is used that has a positive active material total surface area per unit plate group volume set in a range of between 3.5 and 15.6 m/cm. A negative plate is used in which a carbonaceous conductive material and an organic compound that inhibits coarsening of a negative active material accompanied by charging/discharging are added to the negative active material. Moreover, compound(s) chosen from among cationic coagulant, cationic surfactant and phosphoric acid are added to an electrolyte, improving the charge acceptance and the life performance.