26650 lithium battery is a type specification of cylindrical lithium battery. Used in electric tools, lighting, wind energy storage, electric cars, toys, instruments and meters, ups backup power supply, communication equipment, medical equipment and military lights field. The definition of its model law: 26650 type, that is, the diameter of the battery is 26mm, the length of 65mm, cylindrical type of battery (as shown in the figure). Generally used to call lithium batteries, including lithium primary batteries and lithium-ion batteries. Commonly used lithium batteries made of nickel cobalt manganese cathode material, lithium iron phosphate material - INR26650-3.6V-4500mAh, IFR26650-3.2V-3200mAh.