Electrochemically deposited poly(N-methylaniline) (PNMA) is evaluated as a cathode active material together with a Zn anode in the fabrication of rechargeable cells in 1M ZnSO4 electrolyte at pH ∼5. The cell shows an open-circuit voltage (OCV) of 1.35V and a specific capacity of 25.8Ahkg−1. In a second set of experiments, the anion-exchanging PNMA is converted to a cation-exchanging electrode by sulfonation and evaluated in cells. Such an approach enhances the specific capacity of the cell by a factor of 4. The coulombic efficiency of the cell is also increased considerably. A few related experiments are performed on the parent polymer, polyaniline, to facilitate direct comparison of the results.