PURPOSE: To dissolve metallic zinc liberated from an electrode plate group in an electrolyte, and electrodeposit on a zinc electrode and reuse it by mounting a conductive seal which has lower hydrogen overvoltage than that of zinc in the gap between the zinc negative electrode plate group and a container.

CONSTITUTION: A conductive sheet 6 such as sintered nickel, nickel net, nickel plate, sintered iron, iron net, iron plate, graphite, porous graphite sheet is mounted in the gap between a container 4 and an electrode plate group 3. In such zinc alkaline secondary battery, metallic zinc liberated by contact of zinc dendrite with the sheet 6 is dissolved by a local cell mechanism and electrodeposited on the zinc electrode to reuse.