A rechargeable battery is a type of battery that can be used multiple times by recharging it after it has been depleted. Unlike single-use batteries, which must be discarded after their energy is spent, rechargeable batteries can be restored to full power by connecting them to a power source. Common types include lithium-ion and nickel-metal hydride batteries, which are widely used in devices like smartphones, laptops, and electric vehicles. These batteries work through chemical reactions that allow them to store and release energy. When recharging, an external power source reverses the chemical reactions, restoring the battery's energy. Rechargeable batteries are more environmentally friendly and cost-effective over time, making them a popular choice for consumers and industries alike.