Shimano Ultegra 105 Dura Ace Di2 EW-EC300 battery charging cable, 1700 mm

Di2 charger cable for the internal battery that will keep your Di2 system shifting

Di2 uses a powerful long-life 7.4V Li-Ion battery: keep it in top condition and ready for shifting with this specific Shimano Di2 charger

1.5 hour charge time

Plugs in directly to rear derailleur