I think you should be able to just replace it with one from a computer parts store. You may have to pry it off the motherboard & re-solder it if it's the type that doesn't come off easily.
That said, I've never had to do this myself. ;) But I know they can be replaced.
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That said, I've never had to do this myself. ;) But I know they can be replaced.
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I'd pull the battery and then call around to see who has one of the same type. The numbers should be on the back of it.
Good chances you've already done this, but I figured I'd offer help if you hadn't yet.
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There is no obvious CMOS battery on the mother board.