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When I received mine it had 2 bars. Even though Sony says charge upon receipt I just had to play with it. I added some books, deleted some books, played with font sizes, etc. I was about 1/2 way through a 300 page book when it went to 1 bar. That was 4 days. I then charged it so we'll see how long it lasts now. I keep the wireless off and I turn the 900 off when not in use.
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