In addition, there is a clear LED light that indicates the amount of life left in the battery.Campagnolo Super Record 13 Groupset ReviewConnect to the app You can extend your experience with the state of the art MyCampy app. Developed purely for your ease of use. Fully customisable controls to your specific needs, check your progress or view your battery status anytime, anywhere. This app gives you the best possible experience with this groupset. Key Features:Magnetic charging ports on front and rear derailleurs for quick and secure connection. One standard port for both componentsFast charging times: Full charge in just 60 minutesLong lasting charge with 750km battery rangeAbility to charge both on and off the bikeLED battery status interface which is highly visible in all conditions