Shimano EW-EC300 Charging Cable The internal battery of SHIMANO 12-speed Di2 road drivetrains is charged using the EW-EC300 charging cable on the rear derailleur. The special USB cable also fits the charging port of the Dura Ace 9200 and Ultegra 8100 power meter cranks with integrated power meter. Details: • Charging cable for power supply of Di2 battery BT-DN300 or powermeter battery • Charger connection via USB plug type A • Cable length: approx. 1.7 m Compatible with SHIMANO: • Dura Ace rear derailleur RD-R9250 with battery BT-DN300 • Dura Ace Powermeter crank FC-R9200-P • Ultegra RD-R8150 with battery BT-DN300 • Ultegra Powermeter crank FC-R8100-P In the box: • 1 SHIMANO EW-EC300 charging cable (without charger) Attention: To charge the battery via the charging cable, use a mains adapt