The third port is for riders who seek the redundancy of Shimano's 12-speed Di2 wired option. - Compatible with thinner next generation electric wire
Shimano BT-DN300 Di2 Built-in Battery 3 SD300 Port BTDN300 Dura-Ace Ultegra
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Shimano BT-DN300 Di2 Built-in Battery 3 SD300 Port BTDN300 for Dura-Ace Ultegra
SHIMANO BT-DN300 Built-in DI2 Battery - for Dura-Ace 9150 and Ultegra R8150 Systems, Compatible with SD300 Wires : Sports & Outdoors
Shimano, BT-DN300 Di2 Battery, Built-In Type, with BlueTooth connectivity, IBTDN3002 - Mariposa Bicycles
Shimano BTDN300 Internal Mount Di2 Battery (SD 300 Type)
SHIMANO BT-DN300 Battery Built-In Type Di2 Battery Suit For Di2 R7170 R8170 Road Bike Parts RD-R9250 RD-R8150 RD-R7150 - AliExpress
Shimano Di2 BT-DN300 Battery for internal mounting Built-In Battery
日本オーダー Shimano BT-DN300 Di2
Batterie intégrée Shimano BT-DN300 Di2 3 ports SD300 BTDN300 pour Dura-Ace Ultegra 4550170894733
Shimano, BT-DN300 Di2 Battery, Built-In Type, with BlueTooth connectivity, IBTDN3002 - Mariposa Bicycles
BATTERY CHARGER 4A for Batteries Integrated Shimano KD170817067 FOCUS Supply £169.04 - PicClick UK
SHIMANO Battery Di2 BT-DN300 Built In Type — Bike Stop