I just spent two weeks in Iraq, didn't know what the charging possibilities would be (they were actually pretty good) and so took three batteries along for my D3. I did recharge, but it wasn't absolutely necessary. I took several hundred shots, raw+jpg, and may have used the equivalent of one whole charge. I think the lightest solution for you might be to take as many batteries as you think you'll need, and then add one or two. If you're actually trekking for two weeks (that is, spending most of the daylight hours moving, rather than shooting) I can't see you using more than two or three batteries, unless it's really cold. If it's cold...that's another problem. You might need to rig something to carry the batteries close to your body...Under normal conditions, though, two batteries would get you probably at least a hundred shots a day, for all fourteen days. Add what you need to that...Or, you could send me a few hundred dollars, and I'd fed-ex you a perfectly good F5...
I also took 32 gigs of memory, and didn't get close to using it. Left the photos on the cards as my "backup" to my laptop.
JC