Before moving on to Step 4, installing the seatpost
assembly into the AR bike frame, be sure to attach the
Shimano Di2 wire to the battery so the derailleurs can be
powered by the Shimano Di2 SM-BTR2 cylinder-shaped
battery.
With the battery cable connector facing downward,
push the battery into the claw-shaped clip until the
brackets on the clip snap into place on the battery.
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