Rechargeable batteries are energy storage devices that can be used multiple times. Unlike single-use batteries, which are discarded after their energy is depleted, rechargeable batteries can be recharged and reused, making them more environmentally friendly. They are commonly found in devices like smartphones, laptops, and electric vehicles, providing a convenient power source. These batteries work by converting electrical energy into chemical energy during charging, which is then converted back into electrical energy when used. Popular types include lithium-ion and nickel-metal hydride batteries. Their ability to be recharged helps reduce waste and saves money over time, making them a smart choice for consumers.