Shimano | Di2 Sm-Btr1 External Battery Btr1 Di2 Battery External

SHIMANO DI2 SM-BTR1 EXTERNAL BATTERYKEEP ON SHIFTINGElectronic shifting has revolutionized the way many riders ride their bikes. The only downside is that they need batteries to operate. The Shimano Di2 SM-BTR1 External Battery is designed to work with Shimano Di2 drivetrains. It is compatible with Dura-Ace 9070, Dura-Ace 7970, Ultegra 6870, Ultegra 6770, and Alfine Di2 systems. It is designed to last around 1000 miles. Features Designed to last around 1000 miles on average Compatible with Dura-Ace 9070, Dura-Ace 7970, Ultegra 6870, Ultegra 6770, and Alfine Di2 systems Weight: 71g | Shimano | Di2 Sm-Btr1 External Battery Btr1 Di2 Battery External