Shimano Di2 SM-BTC1 Bottle Cage Battery Mount - bike-components

What parts do i need for Ultegra di2 6770 set up? - Singletrack World Magazine October 8, 2018

Shimano XTR Di2 M9050 upgrade-kit 2-speed external battery (SM-BTR2 with SM- BTC1) with suspension connection

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Shimano SM-BTC1 Di2 Battery Case

Clearance requirements for Di2 external battery: Triathlon Forum: Slowtwitch Forums

Shimano Di2 Bottle Cage Battery Mount BTR2 - Cambria Bike

Shimano Di2 Battery Mount BM-DN100 - bike-components

Universal Cycles -- Shimano BM-DN100-L Bluetooth Di2 Battery Mounts [IBMDN100LB]

Shimano Sm-Btc1 Di2 Bottle Cage Battery Mount Black, One Size : Sports & Outdoors