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Yeah I don't have a solid idea yet how mine will behave in either scenario, but I did see about a 2% battery drain over 30hrs after a wall charge, with just a little bit of use in there (maybe 5-10 minutes). I then hooked it up to my computer after those ~30hrs to transfer a couple of other books and just top off the charge, which took about 10 minutes hooked up to the computer before it wouldn't charge further.
I am at 97% charge now after around an hour and a half or so of reading time and 36hrs. Though I have noticed the battery reading seems pretty temperature sensitive with just a few degrees F temperature difference leading to at least a handful of percent difference in battery reading (at least when partially discharged).
For now though, either in full wall charge or topping off on my computer, I am going to "assume" it is charging and working fine until it proves completely otherwise. I will keep rebooting right after a full charge...just in case that is what is keeping it from fast draining.
I can certainly see how, between how temperature sensitive the reading is, that a computer hookup/low amp USB hookup could result in the battery actually charging a bit more than it would off of a wall charger. The faster charging of the wall charger would lead to a slightly higher battery temperature which would likely cause the nook to stop charging sooner as the voltage reading on the battery is going to be higher for a lower state of actual capacitance in the battery.
That said, honestly I doubt the real difference is more than a few dozen milliwatt hours of extra charge getting squeezed in at the lower amperage charging rate (maybe 1-2%).
It does make me feel better that the overall charge time on the wall adapter is roughly correct to get from about 0 charge to a full charge and that my nook probably wasn't actually shutting off and refusing to reboot with anything remaining in the tanks.
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