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The first thing to consider is whether a great big power bank would work better. Unless you have limited power demand and a large number of fast riding hours and multiple days with no access to mains power, USB dynamo charging can't compete, and that's before considering the expense and unreliability and faff factor.
(I've been through various setups and mostly given up. Paris-Brest-Paris was about the only event it made sense)
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@Grumpy_Git
Is there a dynamo usb charging thread that my 1st Dan Google Fu is missing?
Need usb on the go.
So far it appears to be Igaro D2 or forumslader v5