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What is mean CMOS battery use for in computer motherboard ?

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CMOS stands for Complementary Metal-Oxide Semiconductor. It is basically a chip in the mother board that stores information such as your system hardware settings and date and time. It is powered by a battery the size of a small coin. Without the CMOS battery, your computer will revert to original manufacture hard ware settings every time you turn on your computer. If you keep having to set the correct date and time of your computer every time you turn it on, then it's time to replace the CMOS battery. I hope that helps.

Posted on Nov 27, 2014

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I want change my password


to your computer or into BIOS.i think you mean BIOS to do that.
you must clear CMOS should be a button on the motherboard.
push it down 1-2 seconds.if no button on the motherboard you
have to remove CMOS -battery for 10-20 seconds.be careful should be same kind of hook holding it on place.it looks like a watch-battery.

Apr 22, 2013 | Computers & Internet

1 Answer

How can i remove the battery


WARNING: Before you start troubleshooting remember that you are dealing with electricity that can KILL.

http://www.kitchentablecomputers.com/static.php - rules



Only work inside the computer case when the power has been switched off and disconnected. Never open the power source.



Some of the below steps recommend removing physical parts within the computer.

While in the computer it is highly recommend that you be aware of ESD and its potential hazards.


ASUS motherboards, manufactured for both Intel and AMD processors, are a popular choice for custom-built computers.


The motherboard's battery is a flat, round 3-volt lithium battery.

This battery, which is installed in a special motherboard socket, powers up CMOS (complementary metal--oxide--semiconductor).



CMOS is an integrated motherboard chip that stores current BIOS (Basic Input/Output System) settings, such as system date and time.


A CMOS battery may last for many years, but eventually dies.

So you need to replace it.

Purchase a new CMOS battery available from many retailers (see Resources section). ASUS motherboards typically use a lithium CR2032 battery.


Turn off the computer.

Remove the computer case side panel.


Lay the computer on its side.


Find the CMOS battery that is situated in the socket approximately in the center of the motherboard.


Touch an unpainted metal part of the computer case or another metal surface to discharge static electricity.


Lift the CMOS battery out of its socket, using your fingers, and set it aside.


Insert the new lithium battery gently into the socket. Make sure that the battery's positive pole, marked with a plus sign (+), faces up.


Move the computer into the upright position and close the side panel of the computer case.


Press the "Power" button to turn the computer on.


Hope this helps.

Nov 25, 2012 | ASUS P4S800 Motherboard

1 Answer

Acer extensa 4220 will only boot without cmos battery?


OK, wait just a minute. You're telling me that you took the laptop apart to get to the CMOS Battery (which is on the motherboard), put it back together and have been doing this process with the cmos battery in and out? Are you sure you don't mean the battery that is on the bottom of the laptop?

If it boots with the cmos battery out that means you have to go into setup and set the date and time and possibly some other parameters every time because that little batter controls the computer's memory.

Mar 22, 2012 | Computers & Internet

1 Answer

When i restart my computer it shows cmos time is not set and cmos battery failure then after this mes i changed the battery and set the cmos time correct. it works properly till one day and another day it...


I had the same problem one week ago. Check if your SMPS power connection is OK. If it's OK, then you may have to change your motherboard... I mean may be your motherboard is corrupted. Open your cabinet, unplug all the components and clean the whole cabinet properly and re-assemble all the components. Restart your computer but still if the problem sticks be sure to check your computer with a well-knowledged hardware mechanic because there may be other causes.

Dec 22, 2010 | Computers & Internet

2 Answers

I have gigabyte gl 81915 motherboard on my cabinet. but some days ago it's display check sum error default loaded so how can i solve it give me solution?


The CMOS checksum error occurs when the CMOS battery is worn out and the CMOS data gets corrupted. Replace the CMOS battery, this battery most likely a CR2032 lithium coin size button battery - check to make sure before you purchase.
After replacing with a new battery, then go to the BIOS configuration and set the Time

Sep 02, 2010 | Gigabyte GA-945GCMX-S2 Motherboard

2 Answers

Is the cmos battery on a vaio vgn-fe31m on the


Yes the cmos battery is on the motherboard.

Every motherboard that runs a computer has a backup battery to run the circuit while turned off. This battery runs the real-time clock (RTC) and is referred to as the CMOS battery. By keeping the clock active and running even when the computer is switched off, power up/down cycles can be logged and before the internet, your computer could keep dates accurately. It also serves to maintain the system configuration settings in BIOS memory based on RAM or FLASH RAM.

Jun 24, 2010 | Sony VAIO FX150K Notebook

1 Answer

When i start my computer it gives an error "CMOS cheksum error, press f1 to continue.defaults loaded"


This normally means the CMOS backup battery on the motherboard needs to be replaced. Most boards use a commonly-available 3-volt coin cell. It just pops into a holder on the board. Change the battery and that message should quit bugging you.

Jun 13, 2010 | Intel PENTIUM-4 865GV CHIP MOTHER BOARD...

2 Answers

CMOS Battery do no work


Just change your CMOS battery with a new one and after that goto the bios settings and update the time and dare.
After that just save the settings and then check that the warning message is coming or not.

If its coming then it means you need to change the CMOS jumper settings.

Mar 09, 2009 | Asrock 845GV (P4I45GV) Motherboard

4 Answers

Pls i dont know my setup password so i cant enter the bios setup and the person that asembled the computer is no where to be found pls how can i get the password.


Remove the onboard Battery, the one like the coin chaped battery on the motherbaord. then place it back & your bios will be reset.

Feb 02, 2009 | EliteGroup 661GX-M Motherboard

1 Answer

CMOS checksum error


rahul23petit

"CMOS" checksum error default loaded" means ur mother board cmos battery fail (which is locate at mother board), to solve this problem replace it by new one (u can buy it form any computer accessories shop). all oher problem happen for it.

Jul 06, 2008 | EliteGroup BKi810 Motherboard

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