A coin battery
Coin batteries, as their name suggests, are circular and coin-like batteries with a diameter of 5 to 25 mm and a height of 1 to 6 mm. In this type of battery, both up and down are both positive and negative poles, and they come from lithium and the energy generated in the two heads of the battery is 3 volts.
These batteries are used in portable electronic devices with very low flow rates, so these batteries usually have a longer battery life than alkaline batteries.
Wrist watches, remote controls, children's toys, store terminals, cache electronics, hearing aids and attendance devices are among the items that use widespread battery packs.