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It is normal for wifi activity to use a lot more power (lots and lots more) than reading a book.
E-ink devices get extremely good battery life when reading because the screen doesn't need any power to display a static image, and 99.9% of reading an ebook is displaying static images.
But for any other sort of activity - wifi syncing/browsing, playing audio, file processing, etc. they are little better than tablets. Worse even, because they generally have smaller batteries.
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