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You might have a defective unit. After mine charges overnight, it shows three bars black, then after a short while- maybe 3-4 days of 40 minutes reading/day, it will go down to two bars black one bar white (it seems it takes longer to do this reading pdf then epub) . It stays on this for a long time, about ten more days, and then it goes down to one bar black and the irritating message "Low battery-please recharge" pops up periodically. I sometimes can read for a couple of more days on this and then I give in and recharge it. But it has never "suddenly" go from full to empty.
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