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. FEATURES: Compatible with thinner, next generation electric SD300 wires and R9150 and R8150 series systems Features three SD300 wire ports Shared fixing method with BT-DN110 Built-in type