Thanks everyone for your suggestions. I did manage to get a backup battery and the necessary tools, and took it apart and replaced the battery, which was by no means simple. BUT I still have a problem.
Now it is showing that the backup battery is normal and the main battery is fully charged. But as soon as I take it off mains power, it shuts off and will not turn on. I've checked the main battery is fully charged, and the connectors are in order.
It will power on with AC power (though not on the cradle), and hard reset itself every time. Also the power/charge indicator light flashes alternating green and amber.
So it seems like I have bigger problems than just the backup battery. I blame Dell. Twice they had to replace the unit while under warranty, and send me a refurbished model, to which I protested (to no avail). So now that I am just out of warranty, the unit fails? Do they plan it that way?
Can anyone suggest the next move to fix this?
Otherwise, any suggestions for a replacement PDA that is not a Dell??
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