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Did you know there is a battery on your computer's motherboard? Here's what the CMOS motherboard battery does and why you need it.
What Is a CMOS Battery?
CMOS stands for complementary metal-oxide-semiconductor. In the early days of personal computers, CMOS RAM (a volatile memory type) stored BIOS settings.
Why Your Motherboard Needs a Battery
So, if many computers store BIOS settings in non-volatile memory, why do motherboards still come with batteries? Simple: Motherboards still include a Real Time Clock (RTC).
Power the computer on or off---the battery runs all the time. The real time clock is essentially a quartz watch, like an old wristwatch.
When the computer is off, the battery provides power for the real time clock to run. This is how your computer always knows the correct time when you power it on.