Electrochemically synthesized polyaniline (PANI) and lead dioxide have been investigated as electrode materials for PANI/1.1 M H2SO4; 0.5 M (NH4)2SO4/PbO2 rechargeable cell. At constant current charge/discharge of the cell, the average discharge potential of 1.1 V, specific capacity of 50 mA h g−1, specific energy of 55 W h kg−1, and self discharge rate of 2.2% per day have been obtained.