Doctor E Battery is a brand owned by Fu Nan Battery and a high-end brand launched by Fu Nan for the ordinary alkaline battery market. Fu Nan is a well-known trademark in China, a famous brand product in China, one of the top ten battery brands in China, a world-renowned battery brand and an expert in electric light source.

A battery is a device that converts chemical energy into electrical energy. The performance parameters of the battery mainly include electromotive force, capacity, specific energy and resistance.