Shimano Di2 Bottle Cage Battery Mount

* SM-BTC1 mounts current SM-BTR2 Di2 battery externally next to bottle cage.
* Low profile design mounts to any frame with bottle cage mount.
* Junction B function.
* Six E-tube wiring ports with cable organizer.
* Clean appearance thanks to internal wire routing.
* System expansion thanks to E-tube platform.
* Does not include SM-BTR2 battery.