The 18650 lithium-ion battery is a standard lithium-ion battery model, where 18 indicates a diameter of 18mm, 65 indicates a length of 65mm, and 0 indicates a cylindrical battery. It has the advantages of light weight, large capacity and no memory effect, so it has been widely used. Lithium-ion batteries have a high energy density, and their capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight, and they have a very low self-discharge rate.
