What Is the Shimano EW-EC300 Di2 Charging Cable For?

The Shimano EW-EC300 is the USB-C charging cable for current-generation Di2 systems, connecting to the BT-DN300 internal Di2 battery's integrated charging port for in-frame charging without removing the battery. The USB-C connection on the charger end is compatible with any standard USB-C power source -- laptop, wall adapter, or power bank -- making it convenient for travel and daily use. Keeping a spare EW-EC300 eliminates the risk of a lost or forgotten cable causing a dead Di2 system, particularly on a cycling trip or at a race venue where alternatives aren't available.

Compatible with Shimano Dura-Ace R9250 and Ultegra R8150 Di2 12-speed systems using the BT-DN300 battery. USB-C connection on the charging end. The correct cable for all current 12-speed Di2 systems.