So I am taking a week long cycling trip cross state and camping the entire way. I would like to take my iPhone 4 and still be able to actually use it. I will have roughly 15-30 minutes of wall adapter usage available per day so that leaves me looking for other ways to charge my phone. With the lack of AC wall outlets it puts a stop to almost all rechargeable solutions I am seeing in most places and the ones that use AA batteries most claim they do not work for an iPhone 4. I do realize using AA batteries to charge my phone daily is a huge waste but I won't have any other way of reliably charging my phone. I have googled up some options but nothing that looked very promising. If anyone knows of a solution that involves interchangeable batteries or a battery pack that can charge an iphone4 from dead to full at least twice please let me know.