BM-DN100-S, Battery Mount for EW-SD50, Short, for External

Shimano D-Fly Wireless Unit DI2 Ant +/Bluetooth - EW-WU101

Shimano Di2 BT-DN110-A1 Battery Pack

Shimano Di2 BM-DN100-S Battery Mount short internal/external

Pro Di2 Battery Holder Seatpost

Shimano Di2 EW-SD50 Electric Wire Accessories Di2

Shimano Di2 BM-DN100-S Battery Mount (Short Size

Shimano Di2 BM-DN100-S Battery Mount short internal/external

Pro Di2 Internal Battery Holder for Fork Steerer

The Shimano Di2 BM-DN100 External Battery Mount - Long allows for mounting the BT-DN110 battery to the frame's water bottle cage mounts with external wiring. The mount allows for wireless communication with the EW-WU101 wireless data transmitter unit and Bluetooth components. Battery sold separately.

Shimano BMDN100 Di2 Long Battery Mount for External Wiring

Shimano Junction Box A (EW-RS910) Di2

Shimano Di2 Battery Mount BM-DN100 - bike-components