USB chargers don't work with the Reader - you'll find that the charge light doesn't come on. Even charging on a PC's USB port won't work unless the "Connect" software is installed on that PC!
Gravitas - the problem you'll have is that you'll be asked if you want to upgrade every time you connect the Reader to your PC. May as well just do it and get it over with. The battery thing is completely irrelevent, IMHO. All you have to do is, after you've charged the Reader (which is a "once ever few weeks" thing), just momentarily plug in the mains charger with the Reader turned on. The battery meter will immediately reset itself to where it should be, and you're done.
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