Electrochemically synthesized polyaniline (PANI) and lead dioxide have been investigated as electrode materials for PANI/1.1 M H2SO4: 0.5 M (NH4)(2)SO4/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. (C) 2012 Elsevier B.V. All rights reserved.