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I think I looked into this and concluded that you need too many standard batteries and the transfer takes too long for that to make sense.
Does the Exposure have a removable battery? If so, taking two lights would allow charging of two batteries (with a third charged as backup) simultaneously at stops (make sure you get the fuck-off-fast charge capable gear).
Waterproof no. But a plastic bag solves many issues.
http://www.amazon.co.uk/5200mAh-Compact-Portable-External-Technology/dp/B00P8SY7HQ/ref=sr_1_1?ie=UTF8&qid=1432421010&sr=8-1&keywords=anker+portable+charger
11 quid and weighs very little. Will charge an 800 about 4-5 times. That's enough for a hippy PBP? 60 hours of running?