When I first got mine it was terrible. It was already 50% charged so as soon as I got it, I charged up to 100%. I noticed over the next couple of days it was depleting at a very fast rate. Could be due to indexing but I only added 2-3 books.
However after a full charge cycle, it seems to be much better. Even with Wifi turned on. I read about 1-2hr a day and it will last about a month.
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