A lithium-ion battery is a lightweight, high-power battery used in computers and mobile phones. Li-ion batteries are made in several shapes, although a flat rectangle is most common. They are lighter than the nickel cadmium battery and the nickel metal-hydride battery. Li-ion batteries useful for devices that should be lightweight. They work by the movement of lithium ions through a membrane (thin sheet that allows some substances to pass through).
They are different from lithium batteries.[1] Lithium batteries contain lithium metal and are not rechargeable (primary cells). Lithium-ion batteries[2] do not contain lithium metal (only lithium compounds) and are rechargeable (secondary cells). They also do not last forever. Traditional lithium-ion batteries will have an average of 600 charge cycles. Some newer versions such as lithium iron phosphate and lithium titanate can last for 3000 cycles or more.