If there are apps that will let a user examine the charging cycle and battery circuitry on Apple devices, I have not explored them. Interesting question, sorry I cannot be of more help.
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This is one of those things that shows it can be done but to what benefit? The rig looks top heavy and awkward. Racks and panniers were developed for a reason.
Thanks for your thoughts. I don't like the backup battery pack option both for reason of weight and environment. It's the reason I'm looking for a better way to make a fire (so to speak).
I did check out the links listed in the Bike2Power reply but it looks like just another battery pack solution and even though it may be a really excellent battery I really don't want to go that route. I suppose I'll rely on the library/Starbucks network a while longer to charge my tablet. When I'm touring I only use it to read books, magazines, professional literature, etc.,.... you know, the "feed my brains" part of the trip....
As long as I turn it completely off between uses I should be able to make do well enough. Eventually someone will come up with a better way to charge tablets as well. (sigh)
I'm hoping to do some cycle touring next spring or summer in southern Utah, with long distances between available water sources. Besides carrying a few water bottles (inadequate), what options do I have to carry enough water on my bike? I really don't want to wear a Camelbak.