EW-EC300

Brand: Shimano

Charging cable of 12-speed Di2: a USB Type-A plug on one end, a magnetic contact on the other, dropping onto the charging port of the R9250, R8150, R7150 or RX825 rear derailleur. This is how the BT-DN300 battery recharges — through the derailleur, never leaving the frame. It also serves the FC-R9200-P and FC-R8100-P power-meter cranks. Shimano quotes 1.5 m; the mains adapter is not supplied.