Lithium batteries are rechargeable energy storage devices that use lithium ions to move between the positive and negative electrodes during charging and discharging. They are widely used in various applications, including smartphones, laptops, and electric vehicles, due to their high energy density and lightweight design. These batteries come in different types, such as lithium-ion and lithium-polymer, each with unique characteristics. Lithium batteries are known for their long cycle life, meaning they can be charged and discharged many times before their performance declines. However, they require careful handling and proper recycling to minimize environmental impact.