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They may not, in fact, be draining at all. First, you could be getting a false report of low battery. The 2002 version of the OS in particular was notorious for reporting a low backup battery when there was in fact nothing wrong with the battery. This happened to me.
The other possibility (which has also happened to me) is just a bad connection between the backup battery and its contacts. Make sure the battery itself is clean and not oily from your fingers, and make sure it is firmly seated to its contacts. Some members have gently bent the contacts to make them press tighter to the battery; I have put a small piece of pasteboard behind the battery to keep it in better contact.
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