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My battery dangles down into the seattube. have a 5 port junction Box in the stem. If you have a carbon steerer I'd stick a expander into the steerer. I didnt and my steerer is now a bit cushed and waiting to kill me in the face With tamac (I now have a massive expender in there to support it).
Smallfurry-
There is an expander version of steerer battery holder as well: https://www.bike24.com/1.php?content=8;product=145577;menu=1000,4,28
amey
@Smallfurry @Black_Rainbow_Project and whoever else uses Pro Tharsis .. do any of you have battery in steerer tube?
I am wondering what I can achieve using that stem with XTR Di2 1x set up (and a handlebar display). JC41 internal junction box would go in the stem, potentially battery can too and just a single cable can run all the way to rear mech ..