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What Is A Cmos Battery?

The CMOS is usually powered by a CR2032 cell battery, referred to as the CMOS battery.

Most CMOS batteries will last the lifetime of a motherboard, up to 10 years in most cases, but will sometimes need to be replaced.

Incorrect or slow system date and time and loss of BIOS settings are major signs of a dead or dying CMOS battery.

Replacing them is as easy as swapping out the dead one for a new one.