Have you considered trying one of the newer hybrid smart phones? Sometimes referred to as 'Phablets'
I've been considering a Nokia Lumia 1520 for my hike, slightly larger than the average smart phone but just smaller than a tablet.
Pro: Very impressive advertised battery life. 20mp camera. 2gb Ram. 6inch screen. 210g
Con: Expensive and new to market so few practical use reviews available.
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