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My entry into mobile reading has been with the iPhone so I don't know what the battery life is like on other devices; I would guess longer than the iPhone. I use the Books application to read, with ebooks I reformat myself for optimization on the iPhone. I use the white text on black background and the battery life seems to be very good with it. I also break the ebooks up into individual chapters as I find it easier to read, faster to load, and better on the battery life.
The only time I've really put the battery to the test (as iPod chargers are everywhere!) was a 7 hour business meeting. I read for 6 hours on a 50% charge before the battery died.
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