To provide a lead-acid battery in which influences by sulfation of a negative electrode plate are reduced to improve cycle life performance in PSOC (Partial State of Charge). A lead-acid battery includes a negative electrode plate containing carbon black, ...

A negative active material is characterized by being prepared by adding a lignin having a unit structure represented by the formula (I) as the main structure to a lead oxide. Since the lignin of the formula (I) is added, the negative active material can be...

A coated positive grid (20) for a lead acid battery (52) is provided. The coated positive grid includes a strip lead or lead alloy (22) and a coating of lead or lead alloy (24). The strip has first and second surfaces, and a linear elongated grain structur...

A lead acid battery can be obtained which exhibits excellent life properties while keeping the level of self-discharging and electrolyte loss equal to that of those comprising a Pb-Ca alloy collector. In other words, the present invention lies in a positiv...