How to Change CMOS Battery of Computer

If your computer show the wrong clock (reset time to default) every time you boot the computer, it indicate that the CMOS battery has drained. To fix this, first get a new CMOS battery and open up your computer case & find the position where it located.

What is CMOS battery? CMOS battery or as known as BIOS battery is a backup battery provides power to a system when the primary source of power is unavailable. It purposed to run the real time clock circuit and retain configuration memory while the system is turned off. Watch the video below to see how to properly change a new CMOS battery from an old computer.



In my experience, a branded CMOS battery could stay until next 15 years before it replaced to a new one. So if you need to buy a new battery, make sure that you get a correct code. And the common code for this battery is CR2032.

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