At a feather light 71g, the DI2 battery pack powers your entire system. On average, the battery can hold a charge for 1000 miles. Your current battery charge level can be checked through the front wire kit. Mounts to a Battery Mount. Charges externally.
- Extremely reliable | Li-Ion 7.4V technology
- High performance | 1000 miles/1600 km average
- Easy mounting | Fits any road bike & has quick release for easy charging
- (SM-BTR1 and EW-7970 Pictured Together) Updated Firm ware version - A
Note: Limit 1 per customer