Built-in Internal Battery D12 BT-DN300

Shimano Di2 Batteries. The battery, charger, and power cord must be purchased to complete the system.

Shimano BT-DN300 integrated DI2 battery: for Dura-Ace 9250 and Ultegra R8150 systems, compatible with SD300 cables.

FEATURES

All Di2 components on the bike must have the same firmware version. Using Di2 components with different firmware versions may cause malfunctions.
Use the Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/
Compatible with new generation, thinner SD300 electric wires and R9250 and R8150 series systems.
Features three ports for SD300 cables.
Mounting method shared with BT-DN110.
Integrated type.