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Use a jc41 (dumb) junction box, or possibly several...
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You use a Junction B box somewhere else. That effectively just works as a charging port and adjustment doodah, with an in and an out wire. You'll need a junction B box to link together everything else. Saves having to have lots of wires all going down the handlebars.
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Oh, I want one!
danb
Brommers
hippy
@Jaap
in other news, this is now available:
https://www.bike-components.de/en/Shimano/Elektrischer-Verteiler-EW-RS910-fuer-Dura-Ace-Ultegra-Di2-Modell-2017-p53775/
apparently it's a 2 port design.. how the hell are you gonna connect 2 shifters AND have a wire go to the rest (battery and derailleurs)!?