Bring charger and whatever adapter is needed. Charge whenever within reach of an electrical outlet; ferries, campgrounds, airports, motels, friends, etc. I've even asked at bars and restaurants on occasion.
I've also learned not to buy cameras with proprietary batteries. This way, I can carry a couple of extra charged AA batteries for use in my camera, headlamp, etc. The cellphone still needs its own charger (although I've also got an extra battery for it).
Hope that helps.
Mark
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