The small size of the button battery has been widely used in a variety of micro-electronic products, with diameters ranging from 4.8mm to 30mm and thicknesses ranging from 1.0mm to 7.7mm; Generally used for all kinds of electronic products. There are many types of button batteries, most of which are named after the materials used, such as silver oxide batteries, lithium batteries, alkaline manganese batteries and so on.