Shimano Di2 SM-BTR1 External Battery
The standard power unit of battery that brings the Dura-Ace Di2 and Ultegra Di2 systems to life. The lithium Ion battery is housed in a waterproof (and bombproof) case that can withstand abuse from the daily rigors of cycling. One full charge can last for many, many miles.
- Bombproof case
- Reliable Lithium Ion battery
- Works on all Di2 systems
- Shimano Part# SM-BTR1
All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions.