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I have experienced the situation in which a perfectly fine backup battery suddenly reads 0% charge, but upon opening the backup compartment and re-seating the battery, all is fine. Others here have reported similar problems with the contacts of the backup battery.
I would think it is possible that during the process of changing batteries, enough jarring of the case happens to temporarily lose contact with the backup battery, resulting in data loss.
Perhaps opening the backup battery compartment and looking at the contact mechanism (and perhaps, ever so carefully bending the contacts up) will help understand the problem.
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