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Do you want to run it all the time, with the Dynamo hubs constantly powering it?
Even on high end Dynamo hubs, you can actually feel it rumbling slightly when it's on, and sweet fuck all when it's off.
It's best to simply use the Dynamo to charge the battery with a switch without removing the battery in the first place, that would be better.
edscoble-
I've never ridden a dynamo hub, but I have a physics degree and know quite a bit about electrical engineering and resulting forces..
And no! Whether it's on all the time or not. It's the amount of charging done that results in a resistance in your dynamo. So when you plug it in occasionally, you get a higher resistance for a shorter time. Resulting in the same total resistance..
Jaap
yeahh.. so in stead of plugging it in sometimes.. it's now plugged in all the time. and cheaper