BMC TMR01 Instructions De Montage page 9

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3. Insert the Di2 front derailleur wire from the hole located near the front derailleur and exit at the bottom bracket.
4. Mount the battery inside the seat tube, guide the wire from the battery towards the bottom bracket and exit there.
internal battery
5. Connect all Di2 wires coming out of the bottom bracket to the junction, please refer to Shimano installation instructions.
6. Push the wires and the junction back into the bottom bracket and the seat tube.
7. Install the Di2 grommets.