A battery is a device that stores electrical energy and provides power to various gadgets and machines. It consists of one or more electrochemical cells that convert chemical energy into electrical energy. Common examples of batteries include those found in remote controls, smartphones, and electric vehicles. Batteries come in different shapes and sizes, depending on their use. For instance, a small AA battery is often used in household items, while larger batteries, like those in laptops, can power more demanding devices. Understanding how batteries work helps us appreciate the technology that keeps our daily lives running smoothly.