A cell converts chemical energy into electrical energy. The basic cell consists of two electrodes of dissimilar metals that are electrically isolated from each other, an electrolyte, and separators. A chemical reaction inside the cell produces electrons. Electrons must flow from the negative electrode to the positive electrode for the chemical reaction to take place. Unless electrons are flowing, the chemical reaction does not take place. Once you connect a load, the reaction starts. This course discusses many different aspect of battery cells.