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amey-
The description here seems to indicate that the case acts as the 'B' junction box
https://www.rosebikes.co.uk/article/shimano-sm-btc1-di2-battery-case/aid:789164
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Only if the want to run the cables externally and join them externally :)
Howard
danb
Di2 people: I have an internal 6870 group for sells with internal seatpost battery. Someone would like it, but they need to run it externally.
is this external battery mount for the seatpost battery all they need, assuming the e-tubes reach?