[How-To] Change your CMOS battery and re-energise your BIOS

Earlier in my post you learnt how to clear the BIOS password using various tools. It needs to be understood that though the CMOS battery present on your motherboard has a life of 5 yrs approximately but it certainly can drain out if your PC has not been used since long. The lifespan of a battery also depends on parameters like Temperature inside the cabinet, quality of the battery etc.

Coin Cell Battery for CMOS

As a rule, its always better to change the CMOS battery every 2 yrs. CMOS Battery is used to power the BIOS while your PC is switched off, this gives the BIOS power to keep the system clock and date settings along with other information like boot device priority, overclocking settings etc intact even while your PC is switched off and is not being used.

If you have a voltmeter, you can check whether your battery is healthy by measuring the voltage between the battery terminals that connect to the motherboard. The voltage should be higher than 2.5 volts. If the voltage reading is less, you should change the battery right away.

CMOS battery powers the BIOS.

Follow the steps mentioned below to change your CMOS battery.

1.) Startup your PC and hit DEL to go to BIOS Configuration menu. Note down all the necessary settings. Switch off your PC. Then, unscrew and open up your PC Cabinet.

2.) CMOS battery is located on the motherboard. Usually the battery looks like a 5 rupees coin as shown above in the figure.

3.) Once you have bought the new CMOS battery as a replacement for your existing CMOS battery, remove the CMOS battery carefully without damaging other components on the motherboard. You might need a small screwdriver to do so.

4.) As soon as you remove the battery, your current settings are lost. Ensure that you have the settings handy with you.

5.) Fit the new battery into the holder, ensure it is fitted properly.

6.) Switch on your PC and navigate straight to the BIOS settings screen by pressing DEL during startup.

7.) Enter system setting information like date, time, boot device priority, overclocking settings ( if any) etc and press F10 to save and exit the BIOS Configuration menu.

Before your battery drains out completely, it does give you some signals. You should be careful to watch out these signals

1.) Watch out for scenarios wherein the computer asks you to enter date and time information. This is a vital sign which leads to the conclusion that your battery might be draining.

2.) Errors like CMOS Read Error, CMOS Checksum Error, or CMOS Battery Failure are also vital signs to look out for. As a general rule, you might keep your PC switched on for 5-8 hours to get the battery charged and try rebooting the PC. If the error goes off, you still have some more months/years before your battery drains off. If not, head on for a new battery and follow the steps mentioned above to replace your CMOS battery.

Also read:Do you store your passwords using Firefox?

How-to View that password behind those Asterisks

Safeguard your passwords using Keepass

You can also follow me on Twitter at http://twitter.com/vaibhav1981

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Cheers

Vaibhav

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2 Responses

  1. […] out if your PC has not been used since long. The lifespan of a battery also depends on … MORE >>Creadit By weight […]

  2. […] power to keep the system clock and date settings along with other information like boot device phttp://technofriends.in/2008/05/03/how-to-change-your-cmos-battery-and-re-energise-your-bios/DownloadSearch the latest bios version by product. — select a product –, 486-OCV+, 586IPVG, […]

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