Buttoncell, also known as button cell, refers to a battery whose external size is like a small button. Generally speaking, its diameter is larger and its thickness is thinner (compared with cylindrical batteries, such as No.5 AA battery on the market). In button cell, batteries are divided by appearance, and equivalent batteries are divided into columnar batteries, square batteries and irregular batteries.
Button cell is widely used in various microelectronic products because of its small size, ranging from 4.8mm to 30mm in diameter and from 1.0mm to 7.7mm in thickness.
It is generally used as a backup power supply for various electronic products, such as computer motherboards, electronic watches, electronic dictionaries, electronic scales, remote controllers, electric toys, pacemakers, electronic hearing AIDS, counters, cameras, etc.