This book is basically for advanced level undergraduate engineering and science students. This book also helps the battery-scientists to understand the mechanism of polymer batteries. The polymer synthesis both chemically and electrochemically, doping, dedoping and their chareterzation are described elaborately. The charging -discharging behaviour and cyclic voltametry of rechageable battery of assemlled Zinc-polyaniline and Lithium-polyaniline cells enrich the hands-on trainee.