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I would do a factory reset and then add the books back slowly. Keep it plugged in while it indexes. The K4 can be temperamental. It doesn't like too many books. I once sent 20 books to it through email and it froze up on me. I have about 140 books on mine that was slowly added. I get about two weeks charge but I read about 5 to 8 hours a day on it. If I read less I can get 18 days of charge.
I've had mine since release day and it still works fine. So if after a factory reset and less books it still give that amount of battery life give Kindle support a call.
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