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Coin Battery

A coin battery or button cell is a small coin/button shaped battery. The photos below show an example of a CR2032 3V coin battery and battery holder.

These batteries are very often used to keep a real time clock (RTC) running when the main power to a circuit is switched off.

Coin Battery Holder and 3V CR2032 Coin Battery

Bottom View of a Coin Battery Holder and 3V CR2032 Coin Battery