LEAD-ACID BATTERY

A lead-acid battery includes: a positive electrode plate; a negative electrode plate; and a separator interposed between the positive electrode plate and the negative electrode plate. The separator contains a polyolefin and an oil. The separator has a pore volume A of 0.80 cm/g or more and 1.55 cm/g or less and a pore surface area B of 65 cm/g or more and 116 cm/g or less. A product C of the pore volume A and the pore surface area B is 92 or more and 178 or less.