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It's certainly true that you genuinely can use a Kindle for 4 weeks between charges. You can't use an iPad for 4 weeks, no matter how little you use it each day. Its "sleeping" power consumption is significant, whereas that of the Kindle is negligible.
(OK, you could switch the thing off every day, rather than put it to sleep, but I've never encountered anyone who use an iPad or other tablet that way. It's certainly not normal device usage.)
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