Long life and low corrosion lead storage battery with a separator including silica and oil

A lead storage battery including:

• an electrode plate pack comprising a plurality of negative electrode plates which each comprise a negative electrode grid having a tab and a negative electrode active material layer retained by said negative electrode grid, a plurality of positive electrode plates which each comprise a positive electrode grid having a tab and a positive electrode active material layer retained by said positive electrode grid, and a plurality of separators separating said positive electrode plate and said negative electrode plate;
• a positive electrode connecting member comprising a positive electrode strap to which said tab of each positive electrode plate of the electrode plate pack is connected, and a positive electrode pole or a positive electrode connecting body provided at said positive electrode strap;
• and
• a negative electrode connecting member comprising a negative electrode strap to which said tab of each negative electrode plate of the electrode plate pack is connected, and a negative electrode pole or a negative electrode connecting body provided at said negative electrode strap,
• wherein said positive electrode grid, said negative electrode grid, said positive electrode connecting member, and said negative electrode connecting member comprise a Pb-alloy including at least one of Ca and Sn,
• said negative electrode active material layer includes Sb,
• said separator includes silica and contains 5.0 to 30% by mass of an oil,
• the mass ratio of the negative electrode active material to the positive electrode active material in said electrode plate pack is 0.7 to 1.3, and
• said electrode plate pack, said positive electrode strap, and said negative electrode strap are immersed in an electrolyte such that the level of the electrolyte is always above the electrode plate pack, the positive electrode strap and the negative electrode strap.