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Shimano Di2 DN110-A BTR1 Internal Recharge Battery For XTR/Dura Ace Ultegra D-FlyBT-DN110A7
Shimano SM-BTC1 BATTERY CASE XTR Di2 for BOTTLE CAGE MOUNT with JUNCTION-B with EW-SD50 250mm
SHIMANO XTR Di2 Battery Case E-Tube
Universal Cycles -- PRO Components Seatpost Battery Holder [PRAC0094, PRAC0095]
Shimano XT Di2 1x11 Upgrade - First Impression
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SHIMANO DI2 BT-DN110-A BATTERY FOR INTERNAL MOUNTING - GO BIKE SAUDI
Texas Cyclesport Shimano XTR BTC1 Di2 Battery Mount for SM-BTR2 SM-BTC1 89.99 New
Shimano Di2 SM-BTR1 Battery Shimano's Di2 SM-BTR1 Battery is their external power source. It works with all versions of Di2, provided you have a SM-BMR2 Battery Mount to attach the battery to the system. Battery life depends on many factors. It's not only the number of times you shift, but the climatic conditions, and how often you use the front derailleur, as it takes more energy per shift.
Shimano Di2 SM-BTR1 Battery