I generally manage the books on the Reader two or three times a week -- more when I'm creating and testing books and want to see how they look beyond the PC viewer in calibre or the Sony software. The USB charging keeps the Reader topped off. I doubt that it has gone under two bars other than playing around with it and seeing how many pages it would really turn on a charge.
For trips I use the iGo Juice to recharge. I cannot remember when I last used the supplied charger.
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