Batteries are devices that store and provide electrical energy. They work by converting chemical energy into electrical energy through a chemical reaction. Commonly found in everyday items like remote controls, smartphones, and flashlights, batteries come in various shapes and sizes, such as AA, AAA, and lithium-ion. There are two main types of batteries: rechargeable and non-rechargeable. Rechargeable batteries can be used multiple times by replenishing their energy, while non-rechargeable batteries are designed for one-time use. Understanding how batteries work helps us choose the right type for our devices and promotes better energy management in our daily lives.