I'm always surprised to see questions like this. Does your outfitter not cover details like this while booking or planning?
This particular question is not so bad, but so many folks read on the Internet what the outfitter they are paying should be helping or doing for them. This is a big trip, for most it's the biggest most complex trip of a lifetime. Yet it seems outfitters are chosen and the "customer" is left to figure out so much on their own.
How could anyone trust the anonymous personalities of the Internet over the professionals they are paying big buck to for the trip of a life time? I cannot imagine bailing out on my clients like this and expecting to stay afloat!
Here is the site to solve your concerns and put this behind you.
www.walkabouttravelgear.com/elect.htm