When a lead storage battery is discharged, then

Step-by-step solution

The reaction occurring during operation (i.e., discharging) of battery are Anode: P b ( s ) + H S O 4 - + H 2 O → P b S O 4 ( s ) + 2 e + H 3 O + ; E O P o = + 0.356&nbsp V Cathode: P b O 2 ( s ) + H S O 4 - + 3 H 2 O + + 2 e → P b S O 4 ( s ) + 5 H 2 O ; E R P o = + 1.685&nbsp V Net Charge: P b ( s ) + 2 H S O 4 - + 2 H 3 O + + P b O 2 ( s ) → 2 P b S O 4 ( s ) + 4 H 2 O ; E o = 2.041&nbsp V