Electric batteries are devices that store electrical energy for later use. They consist of one or more electrochemical cells that convert chemical energy into electrical energy through chemical reactions. Common types of batteries include lithium-ion, nickel-metal hydride, and lead-acid, each with different applications and characteristics. Batteries power a wide range of devices, from small electronics like smartphones and laptops to larger systems such as electric vehicles and renewable energy storage. They are essential for providing portable energy and play a crucial role in modern technology and sustainable energy solutions.