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Old 06-13-2009, 11:08 PM   #1
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Some BIOS questions

I need to replace my BIOS battery. Apparently, this can require a reinstall of the BIOS. How do I backup this up in Linux and then re-apply it after the battery replacement? Thanks.
Old 06-13-2009, 11:11 PM   #2
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Hardware? System type?

Strictly speaking, I don't think you can take a copy of your BIOS from the BIOS chip, though of course I may be wrong.

Perhaps may set your mind at rest with regards backing it up.
Old 06-13-2009, 11:24 PM   #3
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leave computer turned on

leave computer turned on while you replace the battery is what I do and it works for me.
Old 06-14-2009, 01:24 AM   #4
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Don't think I want to leave the computer plugged in and turned on while I open it up and replace the CMOS battery.
Old 06-14-2009, 01:47 AM   #5
Wim Sturkenboom
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If you still have a printer with parallel interface and a parallel port on your computer, you can use print screen to have at least a paper backup.

Those were the days

Afterwards you can verify the settings against the paper backup.

Personally I do not worry about it: if I'm not mistaken a lot of the settings are nowadays detected by the BIOS and if I can't get it right, I can always take it to the shop.

Last edited by Wim Sturkenboom; 06-14-2009 at 01:49 AM.
Old 06-14-2009, 06:13 AM   #6
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I don't think you ever need to re-flash a BIOS after removing the CMOS battery, the most that will happen is the BIOS settings may be erased, in which case you would need to set them again.
Old 06-14-2009, 09:57 AM   #7
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You will not lose the BIOS by changing the battery. The BIOS is the fixed program the computer runs when you switch it in. The BIOS saves some user changeable data in CMOS RAM memory, which is powered by the PSU during normal operation and by a battery when the power is removed.

In my experience, you have several minutes to change the battery without losing the CMOS data.
Make a note of all the settings in the BIOS screen. Change the battery and check the settings.
If you can keep the time down, I would be surprised if any settings have changed, unless you manage to short the two battery connectors in the process.

Indeed, its often a problem to get rid of incorrect CMOS settings that prevent a PC from booting, even removing the battery and shorting the battery contacts together.
Old 06-14-2009, 01:32 PM   #8
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Replacing the little dime shaped battery did the trick. Even seems to run better afterwards. Weird.


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