I have been searching EBAY and several other sites for a battery charger for the Nikon d5100. The problem with the ones there are that they are AC (plug in) chargeable only. I will be in the Redwoods soon on vacation and Yosemite...so I was a charger I can carry in my pocket that is powered by two double a batteries. The ones on EBAY dont say they are compatible with Double A or any other battery to charge the camera batteries, so I dont want to risk buying one without it. (As there are no plugins in the woods. Or the Camper) Can you all direct me to a link or product that will charge on the go?
Have you considered a solar charger? I see various models advertised in outdoor equipment stores al the time.
Mike
Try a Goal0 solution: http://www.goalzero.com/shop/c/7/ You may want to examine their new "Pixo" Camera Battery Charger. I may just purchase one myself to see how well they work.
I have an Escape 150 with a Boulder 30 solar panel. Good luck!