I'm looking for a light to run from my dynamo hub while on tour. Decent recommended lights that run directly from the dynamo seem like they're all expensive. I was looking at the MiNewt 350 USB(<-- Clicky). My hope is that I can just get a USB plug for my dynamo hub and plug the battery pack into it to charge during the day while I ride. Will that work and not damage the battery?

Otherwise, can anyone recommend a dynamo light for ~$30-40?