Designed for Shimano’s cutting-edge wireless Di2 drivetrain, this battery and charger duo ensures your XTR shifting stays smooth, fast, and reliable, ride after ride. Reliable Power Meets Seamless Integration The BT-DN320 battery is compact, removable, and housed securely inside the XTR Di2 rear derailleur for optimal protection even on the roughest terrain. With a 310mAh capacity, it delivers extended ride time on a single charge. Paired with the EC-DN100 charger, keeping your drivetrain powered is quick and hassle-free. Compact and easy to use, the EC-DN100 is purpose-built for the Di2 system, offering simple plug-in charging for your BT-DN320. Features: Protected, Integrated Power: Battery sits securely inside the derailleur for impact resistance and clean aesthetics Long Runtime: 310mAh capacity delivers more miles per charge Easy Charging: EC-DN100 charger offers quick, simple, and compact charging Wireless Ready: Built to support Shimano’s latest wireless Di2 systems