A battery is a device that stores electrical energy and releases it as needed. It consists of one or more electrochemical cells that convert chemical energy into electrical energy. Batteries are commonly used in various applications, from powering small devices like remote controls and smartphones to larger systems like electric vehicles and renewable energy storage. Batteries come in different types, including alkaline, lithium-ion, and lead-acid, each with unique characteristics and uses. They are essential for modern technology, enabling portable power and supporting the transition to cleaner energy sources. Proper disposal and recycling of batteries are important to minimize environmental impact.