Originally Posted by
northerntier
I've had the pedalpower, and the biologic (w/ schmidt hub), and am no longer a believer. You need to maintain a good pace for a long time or risk having the battery actually discharged. If you are going to stay at regular campgrounds, it's much easier and cheaper to get a decent battery for $40, which can charge an iphone 4-5 times.
I have a battery and it works well.. so maybe the simple solution is really the answer.