Shimano BT-DN300 Built-In DI2 Battery For Dura-Ace 9250 Ultegra R8150 105 SD300

 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
• Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/
• Compatible with thinner, next generation electric SD300 wires and R9250 and R8150 series systems
• Features three SD300 wire ports
• Shared fixing method with BT-DN110
• Built-in type
• US spec

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