LEAD-ACID BATTERY

PROBLEM TO BE SOLVED: To restrain changes of an electrolyte solution face generating deformation of inter-cell barrier ribs caused by a sheet sticking to a drainage port or a decompressed state inside a battery and failures such as liquid leak, corrosion of an anode strap, and deterioration of battery capacity, in a lead-acid battery having a structure of covering the drainage port with the sheet with a view to restrain liquid volume decrease. SOLUTION: A material with flexibility is use as the sheet, crossing slits with a plurality of slits crossed or bent slits having bent parts are provided at a part corresponding to a top face of a liquid plug forming the drainage port of the sheet, and at the same time, a gap part for allowing deflection deformation of pieces formed in the slits in a direction of the liquid plug top face is formed between the top face of the liquid plug and the sheet. COPYRIGHT: (C)2011,JPO&INPIT