I think it is either a bug or a calibration problem. The other day I was reading with a full battery. Put it to sleep and 5 min later it was saying it was empty. I just powered it up and it was working perfectly.
From what I can tell the battery on it is amazing. I have mine since June 10th and only connected it briefly a couple of times to my computer to load books and I am still not at halfway through the battery.
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