Shimano BT-DN300 Di2 Internal Battery - Built-In Type, US Spec

Features:

• 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/
• 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
• U.S. spec
• Charger and power cable sold separately