To solve the problem that the lowering of deep discharge life characteristic is caused as a result of a antimony layer loses adhesion to exfoliate in scales from a lead sheet if the quantity of antimony or thickness of antimony foil, which is used against the trend of shortening of the life caused by active material coming off when the frequency of repetition of deep discharge and charge of a battery, exceeds a certain value.

When conducting press-adhesion or rolling a lead-calcium alloy and a lead-antimony foil, it is made possible to form a high-concentration antimony layer on a lead sheet by rolling a plurality of lead-antimony alloy foils containing low-concentration antimony, to improve adhesion of grids and active material to control the battery life from becomes short.