I'll be hiking up Kilimanjaro in September and won't have access to any electricity for 9 days. Does anyone have suggestions for charging batteries along the way? In particular, Nikon D600 batteries (EN-EL15, same as D800, D750, etc.).
A fellow photographer on the trip is going to bring a backup battery for charging phones and other USB powered things. The battery is supposed to also have 12V output for charging other electronics. There are really cheap chargers on amazon that say they'll work with Nikon batteries, but I would like to hear your experiences.