Shimano BT-R1A External Di2 Battery

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 from http://e-tubeproject.shimano.com/ Product Specifics Shifter/Derailleur Compatibility: Dura-Ace 7970 Di2 Shifter/Derailleur Compatibility: Dura-Ace 9070 Di2 Shifter/Derailleur Compatibility: Shimano Ultegra Di2 Today's Stock Status 10+ Available to ship in 2-4 Business Days UPC: 689228289635 EAN: Not available Manufacturer Part Number: ISMBTR1A BA7970 153753-Q0-L