Installing new CMOS Battery

  gfergie 13:45 20 Jul 2007

I notice in the forum that it tells you how to install a new cmos battery and to make a note of the settings in case they are lost but no one tells me how to re-install them.
Can some one help a 73 year old .

  Gongoozler 13:58 20 Jul 2007

Hi gfergie. You have to manually change any settings from the default.In most cases the default will work OK anyway. In older computers with onboard sound or video, and in which a PCI or VGA card has been fitted you will need to make the selection in BIOS, you may also want to change the boot drive sequence. What you really need is a copy of the motherboard manual so you have a listing of the settings and what they do.

  johndrew 14:11 20 Jul 2007

The links give a write up on changing the CMOS battery and your BIOS settings which will be lost when you change it.

Basically you need to start your PC with the <delete> button pressed to get into BIOS go through the screens and make a note of all settings as these will be lost when the battery is removed.

When you have all the details recorded, turn the PC off and unplug it from the mains. Give it a few minutes to dissipate any stored charges and then open it up and replace the battery. Put it back together and check all your connections.

Fire it up and see if it runs OK. Shut it down and start again using the <delete> button to get into BIOS. Go through all the settings you recorded and if necessary change them to match your list. Save all the settings and the job is done.

Hope this helps.

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  Pamy 14:13 20 Jul 2007

The cmos battery will last for many years ,possible the life of the computer. It retains the BIOS settings. Should you however have to replace it, if you do it quickly you may not loose the BIOS settings. But,you may,so it is best to go into the BIOS first and write down all the settings from every page so that you can type them back into any blank spaces. Do you know how to get into your computers BIOS pages? If you do have a look at them so you will know what they do.

Have a look at this to start with and post back for more help

  dan* 14:57 20 Jul 2007

The easiest thing to do is to make a note of the motherboard, cpu and memory. They are very few settings to change.

Change the battery and post those details here. Then we can post screen shots of which few settings to change, if any.

  Stuartli 15:03 20 Jul 2007

In the last 12 years that have included a number of systems and motherboards, I've never had to change the CMOS battery, which is more often than not a lithium battery.

An obvious indicator to a failing battery is that the time display begins to vary quite considerably from the correct setting.

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