Rechargeable lithium-ion batteries are a type of battery that can be charged and discharged multiple times. They are commonly used in various devices, such as smartphones, laptops, and electric vehicles, due to their high energy density and lightweight design. These batteries work by moving lithium ions between the positive and negative electrodes during charging and discharging. One of the key advantages of lithium-ion batteries is their ability to hold a significant amount of energy relative to their size. This makes them efficient for powering portable electronics and renewable energy systems. However, they require proper handling and recycling to minimize environmental impact and ensure safety.