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The question is How long do I have to stand over an expensive ereader while it charges in the sun?
Do I set it down outside and hope it'll still be there 4 hours later?
Do you leave it under a lamp at home until it's charged?
I backpacked along a short stretch of the Appalachian Trail and read only a very little (paper back then). My vacations were only a week at a time, and most readers should be able to handle that.
So other than a long time in the woods I don't see much use for a built-in solar charger.
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