The invention provides a lead storage battery, which have a plurality of single cells (12). Each of the single cells includes an
electrode plate group (11), an
electrolyte and a single
cell chamber (14). The
electrode plate group (11) is accommodated in the single
cell chamber (14) in the state of being impregnated in the
electrolyte. The
electrode plate group is composed of multiple positive electrode plates (2) and multiple negative electrode plates (3) that are alternately arranged via separators (4). Each positive electrode plate (2) comprises a positive electrode
current collector with an electrode lug (9), and a positive active material layer held by the positive electrode
current collector. Each negative electrode plate (3) comprises a negative electrode
current collector with an electrode lug (10), and a negative active material layer held by the negative electrode current collector. The invention is characterized in that a positive electrode
busbar (6) of the positive electrode plates of one single
cell battery mentioned above and a negative electrode
busbar (5) of the negative electrode plates are respectively connected with the respective negative electrode
busbar (5) of the negative electrode plates and the positive electrode busbar (6) of the positive electrode plates of single cells adjacent to the single cell through non-electrode post direct
welding, so that the plurality of single cells are connected in series. Moreover, the ratio of the sectional area of the electrode lug of each positive electrode plate to the sectional area of the electrode lug of each negative electrode plate is greater than or equal to 0.6 and less than 1.0.