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Thread: Handling Dead BIOS Battery

  1. #1
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    Handling Dead BIOS Battery

    Now that winter is getting closer in the north part of the US of A and the nights get pretty cold, my Epia M1000's CR2032 BIOS battery backup battery voltage drops low enough to reset the BIOS every evening. This sucks, because I have to carry a keyboard with me so that I can put the BIOS back to "don't complain about no keyboard" mode.

    Does anyone else have this problem? How can I keep 3V running to the BIOS?

    Thanks!

  2. #2
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    i had that problem yesterday would be interested in any suggestions

  3. #3
    Maximum Bitrate psyrex's Avatar
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    First, probably replace that battery since continuous drain and recharge probably has damaged it so it can't hold much of a charge anymore. Anyways, while yes there is a direct relationship between battery discharge and low temperatures, I looked up the CR2032 (link) and they should be able to go down to -20C (-4F). (different brands probably will be different, but probably in the same ballpark) How cold does it get for you over there?

  4. #4
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    There's a relationship between battery temperature and voltage output across the terminals. In my case, it seems like whenever the temp reaches 20-30F, the battery's voltage drops low enough for the BIOS to lose its memory.

  5. #5
    Variable Bitrate Nerd2's Avatar
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    2 batteries in parallel?

  6. #6
    Neither darque nor pervert DarquePervert's Avatar
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    Quote Originally Posted by Nerd2 View Post
    2 batteries in parallel?
    And how, pray tell, do you propse to pull this off with a pancake-style battery in a socket that's mounted to a PC motherboard?
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  7. #7
    Low Bitrate 20mg's Avatar
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    Quote Originally Posted by DarquePervert View Post
    And how, pray tell, do you propse to pull this off with a pancake-style battery in a socket that's mounted to a PC motherboard?
    its possible. it would require some soldering and probibly like 4 dollars for the wire and new battery case at radioshack. you could just solder a wire to the battery terminal on the board and run it to a seperate battery holder, it would only be connected to the mother board through the 2 wires so u would have to find a place in your computer case to secure it. but it would definitly work

  8. #8
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    Soldering on the BIOS terminals should be easy as the battery connectors are fairly large. If you are going to solder, why not use two AA's in series for 3v? I believe lithium based AA cells (lithium iron disulfide or lithium manganese dioxide) would be suitable for the low temps because they retain over 75% of their service capacity even at -20C. I was also interested on this issue, and here is a datasheet which provides some technical details on temperature effects on different batteries:
    [media]http://data.energizer.com/PDFs/temperat.pdf[/media]

  9. #9
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    the temps here have been getting to 30 at night so i changed the battery today will see what happens if that don't work look like it's time to break the solder iron out thanks for that idea never thought of that

  10. #10
    MySQL Error MatrixPC's Avatar
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    I have the same problem with my Supra setup and temperature in Socal is no where near 50F yet let along 30F.

    I have come to a conclusion that either the BIOS chip is crew or something else, but not the battery drain as I can use that battery in other system without problem.
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