No, it's not. e-books have nothing to use battery when there are no pages being turned, so there is no reason it would run for a certain number of hours. It would run for a certain number of pages turned, that is unless they were using wifi, but they would not leave wifi on when testing the battery, so that is a non-issue.
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50 hours. For comparison, a PDA has like 6 hours. Even an iPod, which has a pretty small display, gets 15 at most. And laptops get like 2.
50 hours is about in-line for e-ink.
No, it's not. e-books have nothing to use battery when there are no pages being turned, so there is no reason it would run for a certain number of hours. It would run for a certain number of pages turned, that is unless they were using wifi, but they would not leave wifi on when testing the battery, so that is a non-issue.