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Unless you don't camp at a power source regularly
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Interesting...I wonder how long that takes to fully recharge?
That would be lot cheaper than get dynamohub and usb-charger, but on the other hand that's heavier and even though that thing ain't huge, it still adds to things that you have to carry. Not that it matters that much unless going light touring/bike packing.
Mule 
makko
@edscoble
20,000mAh battery anyone?
Suddenly dynamo doesn't seemed that useful anymore with that much power.