Shimano Di2 SM-BTR1 Battery
With the Ultegra DI2 group, electric shifting is at your fingertips. The BTR1 is a high-performance 7.2 volt Lithium-Ion battery pack to power the Ultegra DI2 system. It holds a charge for at least 1,250 miles (2,000 kilometers) - weeks, or even months of riding for most athletes.
- 71 grams
- recharges in just 90 minutes
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