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Laptop BIOS Battery Replacement

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by zekeallmon

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I am working on a Twinhead Slimnote 8133TV where the BIOS battery is dead. However, after taking this beast completely apart, I cannot find the battery anywhere. I have literally taken everything out except the motherboard. I guess you would haveto see the machine to actually help, but I am hoping on a longshot that someone has had the same problem. If you have, let me know.. Thank you very much.

3 replies

by thechas

Have you checked with the manufacture for how to change the battery?

I do have a couple of ideas.

Look for the BIOS and Real Time Clock chips.
Find the chip mfg, and check the data sheet for the chip.
Some of these have built in batteries.
I would then look underneath any socketed IC for the battery to be hidden inside the socket.

Finally, there is a clas of capacitors referred to as "supercaps".
These are High value (.5 - 1 F) electrolytic caps that may be smaller than the old NiCad style back-up batteries.
If this cap goes leaky, it would simulate a back-up battery failure.

Chas

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