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Depends on how long it was connected up for each time and what you were doing. I think USB can typically be counted on for 500ma per hour. So with a 1000maH battery, and two hours+ of time connected even a dead battery would charge fully, in theory.
As far as a stronger battery goes, I tend to read while watching TV, so my pages turns per hour may not be as high as yours, but the LED lighting stays on, and if I notice I haven't been reading for a few minutes I'll throw in a few extra page turns back and forth to simulate. I'm making every effort to maintain a fair, if not perfect, test.
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