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It's just a guess but presumably simply powering an 8.1" screen takes more juice than a 6" screen. But the point is not really about absolute lengths of time batteries will last between charges (not least because as Shaggy and (I think) mgmueller have advised me elsewhere, keeping the battery topped up is better for the battery than letting it fully discharge). More importantly for me is whether the power management facilitates my use or gets in the way of using the unit and becomes a pain. For me something like a week with two or three hours a day reading, a bit of side loading, some flipping about between publications, and a bit of word searching between charges would be perfectly fine. I'd probably want to plug it in over the weekend to top it up whether the battery meter said 60% or 5%. However, four days between full and empty and doing nothing would be a pain.
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