The overall reaction in the lead storage battery is below.
Pb(s) + PbO2(s) + 2 H+(aq) + 2 HSO4‾ (aq) 2 PbSO4(s) + 2 H2O(l)
Calculate script e at 25°C for this battery when [H2SO4] = 4.5 M, that is, [H+] = [HSO4‾ ] = 4.5 M. At 25°C, script e° = 2.04 V for the lead storage battery.