An lead-acid battery is described. The battery includes a carbon fiber electrode having a paste containing a novel additive including one or more carbons, organic expanders, and barium sulfate.

This porous aluminum sintered compact is a porous aluminum sintered compact in which a plurality of aluminum base materials are sintered together, and a TiAl-based compound is present in bonding portions at which the aluminum base materials are bonded together. It is preferable that a plurality of columnar protrusions protruding outwards are formed on an outer surface of the aluminum base material and the bonding portions are present at the columnar protrusions.

An lead-acid battery is described. The battery includes a carbon fiber electrode having a paste containing a novel additive including one or more carbons, organic expanders, and barium sulfate.