A lead acid storage battery comprising a battery container, a plate assembly assembled by stacking a negative electrode plate (1) and a positive electrode plate (2) one upon another through a separator interposed between the negative and positive electrode plates, and a saddle placed on the bottom surface of the battery container for absorbing the extension of the positive electrode plate. Legs (1a) of a negative electrode grid plate (1) consisting of the negative electrode plate are larger in width than legs (2a) of a posisitve electrode grid plate (2) consisting of the positive electrode plate. <IMAGE>
