I've read something about the battery meter being reset when you fully charge the unit and then power cycle it. Is there any other way to kick this off?
Nope. You'll need to charge it up, and then let it discharge until it tells you it must be recharged. If your battery meter is severely off, you may need to do this multiple times before it'll be accurate.
If this does not work, then it's possible that the meter is not the problem, and that there is something wrong with the battery itself, or with the nook.
Actually, in most cases, if the problem is that the meter is off, the meter shows the battery is drained when the battery is actually not drained, not the other way around. So your problem may not be battery meter calibration at all.
I just talked to the B&N phone support and I'm not sure I understood what they were saying.
My unit screen indicates that the unit is fully charged but the amber light is still on. I would guess at this point that the OS battery gague is incorrect and the hardware indicator tells me it's charging. The person on the phone said that when connected to a computer, the LED would always be amber. That didn't sound correct to me...
They also indicated that there was no process to correct the OS battery meter. That also seemed off to me.
I was assuming the OS was involved in the charge cycle and an incorrect reading would stop the charge before it's completed.