Shimano BT-R1A External Di2 Battery

Shimano BT-R1A External Di2 Battery. 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
• Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/

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