Answer:
A lead storage battery consists
of anode of lead, cathode of a grid of lead packed with lead dioxide (PbO2)
and 38% solution of sulphuric acid as electrolyte. When the battery is in use,
the following reactions take place:
Anode: 
Cathode:
Overall reaction:
On charging the battery, the reverse reaction takes place,
i.e., PbSO4, deposited on the electrode is converted back into Pb
and PbO2 and H2SO4 is regenerated.
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