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The Shimano Di2 BM-DN100 External Battery Mount - Short allows for mounting the BT-DN110 battery to the frame's water bottle cage mounts with external or internal wiring. The mount allows for wireless communication with the EW-WU101 wireless data transmitter unit and Bluetooth components. Battery sold separately.
Shimano Di2 BM-DN100 Short Battery Mount
Texas Cyclesport Shimano SM-BTR1 Di2 Battery, External System SM-BTR1 60.99 New
Shimano Di2 SM-BTR1 External Battery Excel Sports
Shimano Dura-Ace Di2 Battery : Sports & Outdoors
Shimano SM-BTR1 external battery for Di2.
Shimano Di2 Battery SM-BTR1
The Shimano SM-BTR1 is a rechargeable 7.4 volt lithium-ion battery for the Dura-Ace Di2 and Ultegra Di2 component systems. Shimano recommends
Shimano Di2 SM-BTR1A Universal Battery [ISMBTR1A]
Shimano Di2 Batteries. Must purchase battery, charger, and power cable to complete the system. All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions. Di2 External Battery, battery charger, and power cable are universal between Dura-Ace 9070, 7970, Ultegra 6870, 6770 and Alfine Di2 systems. Battery weighs 71g.
Shimano SM BTR1 Di2 External Battery
Shimano Di2 Bt-dn110-1/btr1 Li-ion Battery Pack Internal Recharge Battery For Xtr/dura Ace/ Ultegra - Bicycle Derailleur - AliExpress
Shimano Non-Series Di2 SM-BTR1 Di2 external mount battery, Batteries & Chargers
Shimano Di2 Bt-dn110-1/btr1 Li-ion Battery Pack Internal Recharge Battery For Xtr/dura Ace/ Ultegra - Bicycle Derailleur - AliExpress