Probably the battery replacement was NOT done correctly or there is a problem with the battery voltage getting to the memory.
The original message was probably the result of the unit detecting the data was corrupted due to the backup battery not maintaining the memory.
The CORRECT Lithium cell for this unit is a CR2450
This is NOT a common available cell and LIKELY the person installed a readily available one which is not working.
Here is link to a supplier:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=N340-ND
This cell is thicker than the commonly available cells and if the readily available was installed, it would not make contact. Open the unit and check the cell in the holder at BT1 on the board.
Here is service manual which has disassembly instructions.
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I am having this same problem. I've replaced the battery (hard to get to btw) and the problem went away. Within about a month though, the problem came back. I'm wondering if there isn't some kind of short that is draining my battery when not in use? Any ideas?
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