During charging (electrode signs as in charging circuit)(+) electrode: PbSO4(s) + 2H2O(l) ? PbO2(s) + 4H+(aq) + SO42-(aq) + 2e-(-) electrode: PbSO4(s) + 2e- ? Pb(s) + SO42-(aq) Discharging (electrode signs as for cell)(+) electrode: PbO2(s) + 4H+(aq) + SO42-(aq) + 2e- ? PbSO4(s) + 2H2O(l)(-) electrode: Pb(s) + SO42-(aq) ? PbSO4(s) + 2e- The overall, reversible cell reaction is therefore:PbO2(s) + 4H+(aq) + 2SO42-(aq) + Pb(s) ? 2PbSO4(s) + 2H2O(l)______________________________________…http://www.chemistry.uoguelph.ca/educmat…http://www.practicalchemistry.org/experi…http://en.wikipedia.org/wiki/Lead%E2%80%…http://www.upsonnet.com/Batteries_Lead_A… 1 year ago Thanks