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Shimano Di2 SM-BTR1 Battery Pack
This rechargeable battery pack is the heart of the Shimano Di2 system. It's designed to keep your derailleurs going for up to 1000km, no matter how many times you shift. It uses Lithium Ion technology for superior performance with minimal size and weight.
High-performance 7.4V Lithium Ion battery keeps your drivetrain running in all conditions
Lithium Ion technology is lighter and allows for a smaller battery with the same performance
Rechargeable Di2 battery holds it's charge for 1000km, no matter how many times you shift
Mounting bracket is compatible with all road bikes