Give one example for a secondary battery. Give the cell reaction.

Explanation

Lead storage battery is an example of secondary battery.
The cell reaction when the battery is in use are
`Pb_((s))+SO_(4(aq))^(-2)to Pb SO_(4(s))+2e^(-)` (Anode)
`PbO_(2(s))+SO_(4(aq))+2H_(2) SO_(4(aq))to 2 P bSO_(4(s))+2H_(2) O_((l))` (Cathode)
Overall call reaction is
`Pb_((s))+PbO_(2(s))+2H_(2)SO_(4(s))+2 Ni(OH)_(2(s))+H_(2)O_ ((l))`