Coin cell battery

Updated: 04/26/2017 by Computer Hope

Alternatively referred to as a button cell or watch battery, a coin cell battery is a battery on the computer's motherboard for retaining important system settings while the computer is off. For instance, it provides power to the system clock so that the computer can remember what time it is after being powered off. The picture is an example of a coin cell battery used in many computers.

Battery terms, CMOS