Shimano BT-R1A External Di2 Battery

Experience reliable and efficient power management with the Shimano BT-R1A External Di2 Battery, designed to seamlessly integrate with your Shimano Di2 system. This essential battery ensures consistent performance and longevity for your electronic shifting setup. Please note, to complete your system, the battery charger and power cable must be purchased separately.

• Ensure all Di2 components on your bicycle run the same firmware version to prevent operational issues—mixing versions may cause malfunctions.
• Keep your system up-to-date effortlessly by using the Di2 system checker available at http://e-tubeproject.shimano.com/ to update your component firmware.