Lead Acid Battery

2. The lead–acid battery is first invented in 1859 by
French physicist Gaston Planté. It is also known
as Lead Storage Battery. It is an example of
secondary cells which are rechargeable. It is
used in automobile starting, lighting and
ignition.They are used in back-up
power supplies for alarm and smaller computer
systems and for electric scooters,
electric wheelchairs, electrified bicycles, marine
applications and electric vehicles.

3.  Rectangular ebonite
case.
 Contains H₂SO₄ (5M).
 Electrodes are made
up of Lead.
 Anode is coated with
spongy lead
 Cathode is coated with
lead dioxide (PbO2) &
spongy lead (1:1).

4.  At Anode (Oxidation)
Pb(s) + SO−
4(aq) PbSO4(s) + 2e
 At Cathode (Reduction)
PbO2(s) + SO−
4(aq) + 4H+(aq) + 2e− PbSO4(s)
+2H2O(l)
 The total reaction can be written as
Pb(s) + PbO2(s) + 2SO−
4(aq) 2PbSO4(s) + 2H2O(l)
Process of Discharging it behaves as Voltic Cell.
Process of Charging it behaves as Electrolytic Cell.

5. Because the electrolyte
takes part in the charge-
discharge reaction, this
battery has one major
advantage over other
chemistries: It is
relatively simple to
determine the state of
charge by merely
measuring the specific
gravity of the
electrolyte; the specific
gravity falls as the
battery discharges.

6.  These are employed in emergency lightening
to provide power for sump pumps.
 Used in electric motors
 Submarines
 Nuclear submarines