NEW Shimano BT-R1A External Di2 Battery - 7970, 9070, 6770, 6870

Shimano Di2 Batteries. Must purchase battery, charger, and power cable to complete the system.

• All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions
• Use Di2 system checker to update component firmware
• Shifter/Derailleur Compatibility: Dura-Ace 7970 Di2
• Shifter/Derailleur Compatibility: Dura-Ace 9070 Di2
• Shifter/Derailleur Compatibility: Shimano Ultegra Di2