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It sounds like a defective unit to me also, much more than just a bad battery. Even if your main battery is totally dead, the unit is supposed to be able to run for up to 30 minutes on the backup battery.
So it almost sounds as if both the backup and the main battery are either not charging correctly, or there is a major system electrical problem.
As for the hard reset, this will happen if you have no power to the unit at all, as the flash memory requires power to maintain data.
I would suggest waiting for the battery and trying it, but don't be suprised if it doesn't work. If it was me and the store you bought it at allows returns for as long as you have had it, I would simply return it to them as defective and get a new one. Much less hassle for you.
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