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IMO the easiest, most hassle free, and lightest way is to buy a battery pack. I personally like and prefer New Trent battery packs. Buy the size that you need, and your good to go. I personally have the 9900mah battery pack, that is one of the larger models, but fits me needs so i eat the weight penalty. I use the battery pack to recharge my iphone, my headlamp, and gps if its along. They make anywhere from 1800mah-15000mah packs i believe.
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