whats a long time? I can have my 3G in standby for over 15 days in airplane mode. If you just use it to take pics and then lock it afterwards, I dont see why you wouldnt make it for a couple of weeks.
I don't have a link but they do exist. The one I saw was in an Altoids can so that may help you search for it. I remember the main part of the story was reverse engineering Apples' implementation of full vs trickle charge and avoiding an "accessory not compatible" message.
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_1 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8B117 Safari/6531.22.7)
I'm asking you Pros because every freaking charge product out there is obsolete with each new iphone. I have so many car chargers that I am pissed to find "not compatible" with my phone.
Thought ya'll could help. Adding just a 4 to the end of the search doesn't really help. It's just tagging "4 AA batteries"
It will drain your ipone4 battery quickly even you set your iphone in airplane mode. Why not take a iphone solar charger as your backup battery and it can charge your iphone battery at any places in any time.
This article might give you ideal solution: http://www.squidoo.com/solar-charger-review