What is the main function of a battery?

The main function of a battery is to store chemical energy and convert it into electrical energy. This process occurs through electrochemical reactions within the battery, where the chemicals involved undergo transformations that release energy in the form of electric current. When the battery is connected to a circuit, it provides power by allowing this stored energy to flow as electricity, powering devices and circuits.

In contrast, regulating electrical flow typically involves components like resistors or regulators rather than batteries. Storing mechanical energy is characteristic of devices such as springs or flywheels, not batteries. Enhancing wireless signals pertains to devices like amplifiers or repeaters that improve communication signals, which is also not a function of batteries. Therefore, the correct answer highlights the fundamental role of batteries in energy storage and conversion, distinguishing them from other electrical components and devices.