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I've actually just had different plugs for the lights and the charger, just plugged the charger to the hub when I wanted to use it. Which has not been that often, as I have Etrex using AAA batteries. And then the charger is separate from everything else, in case it fails. And it doesn't add any resistance when it's not plugged in.
Samuli
hippy
Depending on how permanent you wanna make it though you could just wire it up with a splitter on all your dyno bikes and then remove it when you don't need USB charging. #cleanlinesbro