Shimano BM-DN100 Battery Mount for SM-BTR1 Di2 Battery-Pack - black - 2nd Choice

2nd Choice. Further information in the product description.

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Shimano BM-DN100 Battery Mount for SM-BTR1 Di2 Battery-Pack

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Shimano BM-DN100 Battery Mount for SM-BTR1 Di2 Battery-Pack

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