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Jaap-
Plugged in all the time isn't a good thing and it's not cheaper because it's using a 3rd-party battery. The choice of USB charging device is basically irrelevant. But the D1 is better than the E-Work.
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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.
hippy
edscoble
It's basically the same thing as an E-Work. It takes hub dynamo power and coverts it to a 5v USB output so you can plug in any USB device.
https://www.igaro.com/D1