If you're setting up an original external-battery Di2 system or replacing a lost cable for one you already own, this is the piece that connects the wall to the charger. The Shimano SM-BCC1-2 is the 120V North American power cable for the SM-BCR1 external Di2 battery charger, using a standard Type-A two-prong plug that fits any household outlet in the US or Canada.

The SM-BCR1 charger it plugs into is the one paired with the original SM-BTR1 external Di2 battery found on Dura-Ace 7970 and Ultegra 6770 Di2 systems. Battery, charger, and power cable are universal across those two generations, so if you're running either groupset, this cable is the correct replacement. It's a common item to misplace during a move or a bike build, and Shimano sells it separately rather than forcing you to buy an entire replacement charger kit.

The same cable also works with Shimano's EC-E6002 charger for STEPS e-bike systems, which shares the identical connector and voltage requirements. If you have both a Di2 road bike with an external battery and a STEPS-equipped e-bike in the garage, one SM-BCC1-2 can serve both chargers. Riders traveling internationally should note that Shimano offers regional variants in the same BCC1 family — the SM-BCC1-1 uses a European plug, the SM-BCC1-4 covers Australia and New Zealand, and the SM-BCC1-5 is the version for China. The charger itself handles voltage conversion internally, so swapping cables at your destination is simpler than carrying a converter.... Read More