The type of energy transformation that occurs in a battery is the conversion of chemical energy into electrical energy. In a battery, chemical reactions take place between the electrolyte and the electrodes, resulting in the flow of electrons through an external circuit when the battery is connected to an electric device. This process allows batteries to deliver power for a variety of applications, from portable electronics to electric vehicles. The efficiency and capacity of a battery depend on its chemical composition, structure, and the nature of the reactions occurring during its operation, impacting its overall performance.