Originally Posted by liquidmonkey
i've heard of dynamo's but have only seen them used for lights, not really for hooking up to a battery (to charge) or to a mobile phone, laptop, camera etc.
does such a device exist?
Since you're only putting out a couple of hundred Watts while riding, that doesn't leave much to charge anything with a dynamo. It would take hours with _all_ of your energy going to the battery, and none to moving.
I'd love to be wrong, though. That would be cool.