Shimano Di2 SM-BTR1 External Battery Excel Sports

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Shimano Di2 Bt-dn110-1/btr1 Li-ion Battery Pack Internal Recharge Battery For Xtr/dura Ace/ Ultegra - Bicycle Derailleur - AliExpress

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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

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Shimano Non-Series Di2 SM-BTR1 Di2 external mount battery, Batteries & Chargers

Shimano Di2 BM-DN100 Long Battery Mount Excel Sports

Universal Cycles -- Shimano SM-BTR1 E-Tube Di2 External Battery [ISMBTR1A]

Texas Cyclesport Shimano SM-BTR1 Di2 Battery, External System SM-BTR1 60.99 New

Shimano Di2 SM-Btr1 External Battery

Shimano Dura-Ace Di2 Battery : Sports & Outdoors

Shimano Di2 Bt-dn110-1/btr1 Li-ion Battery Pack Internal Recharge Battery For Xtr/dura Ace/ Ultegra - Bicycle Derailleur - AliExpress

Shimano Di2 SM-BTR1 External Battery Excel Sports