Battery - Page 139

A battery is a device that stores electrical energy in chemical form and converts it into electrical energy when needed. It consists of one or more electrochemical cells, which generate a voltage through chemical reactions between the materials in the cells. Batteries are commonly used as a power source for various devices, including portable electronics like smartphones and laptops, electric vehicles, and energy storage systems for renewable energy sources. They are classified into primary batteries, which are non-rechargeable and designed for single-use, and secondary batteries, which are rechargeable and can be reused multiple times. The efficiency, capacity, and lifespan of a battery depend on its chemical composition, design, and usage conditions.