Polak, given how expensive the trip is going to be in the first place, you can probably also invest in an AA-powered digicam and use nimh cells (or AA lithiums) in it. The Canon A510 seems like a real nice choice. If you don't use the LCD screen or flash much, you can probably get 400+ pictures on a pair of AA lithiums, which means 20 or so cells should be enough for the whole trip, and be less of a load than a NiMH charger. I dunno how well NiMH works in very cold weather anyway.