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Negative electrode undergoes a reduction reaction:PbSO4+2e=Pb+SO4 Ō-
Positive electrode undergoes oxidation reaction: PbSO4+2H2O=µPbO2+4H++SO4 µ -+2e
Often in a state of insufficient charging or over discharge, thenegative electrode gradually forms a coarse and hard granular leadsulfate, which loses its activity and cannot participate inchemical reactions. This phenomenon is called sulfation of activesubstances. Sulfation reduces the effective capacity of batteries,and over time, it can lead to battery failure. To prevent thisphenomenon, the battery should be charged in a timely manner andover discharge should be prevented.