CMOS Battery

CMOS Battery

The CMOS battery (or the motherboard battery) has a unique purpose in a computer. This page will explain what the battery is, how to change the CMOS battery and how to remove the CMOS battery and a range of other things to do with that little computer battery inside your motherboard.

CMOS Motherboard battery

The CMOS is a little bit of RAM that stores all the BIOS information so that each time the computer restarts or powers on, the computer can remember this information. You can find out more information about the CMOS and BIOS in their relevant pages.


So you are asking what does the CMOS battery have to do with all of this? Well this battery in the motherboard, is what powers the CMOS RAM when the computer is turned off. So that it doesn’t lose all your BIOS information.


battery cmos motherboard


If you didn’t have this battery, then each time you turn on your computer, the BIOS settings would reset and you would need to setup your BIOS again. Your computer will function but everything in your BIOS, such as the boot order, and the time and date, and other functions will reset.


Thus this little CMOS Battery proves more important then it looks. If your battery dies as they do after a while then you can purchase another one. They cost a few dollars at your local supermarket, newsagent or chemist.


Removing the CMOS battery is a way to reset the CMOS password. Read more here…..


To remove the CMOS battery is quite a simple task, simply press the little silver thing back, and release the battery. To insert the battery again just push the battery and it will fall back in.

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