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Unless I misunderstand you. You need both.
Junction B at the BB. Which is simply a 4 port Box (battery, rear mech, front mech, Junction A).
Junction A at the stem. Which is the one you plug into to charge, and use for trimming. The shifters plug in here (as well as TT shifters if its a 5 port) as does a cble that runs to Junction B.
Smallfurry
@hugo7
Is anyone using the BB junction box?
A couple of Qs; 1) is it much more of a faff than the stem mounted one and 2) can you still use the internal / seatpost battery?
Cheers.