I'm using the Goal Zero Nomad 7 to charge my iPhone, Camelbak All Clear water purifier, and Light & Motion Solite 100, on a 26 mile trip up Pikes Peak.
Batteries are made smaller and lighter by making them rechargeable, so no longer do you need to remember spare batteries.
More gear reviews at http://bctreks.com/category/gear
Products mentioned:
Goal Zero Nomad 7: http://goo.gl/rwCbb
Camelbak All Clear: http://goo.gl/bEZKv
Light & Motion Solite 100: http://goo.gl/T0pDu
