Shimano BT‑DN300 Built‑In Di2 Battery (Internal, 3 Port)

Power your Shimano Di2 12-speed groupset with the BT‑DN300 internal battery — the next-generation upgrade for R8100 Ultegra and R9200 Dura‑Ace systems. Slim and compact, it's designed to be mounted inside seat posts or downtubes for a fully integrated, clean electronic shifting setup. With three SD300 ports, this battery supports multiple wired connections and future expansions like rear derailleur, bar-end junctions, or additional split wires.

Key Features:

• Built-in internal Di2 battery compatible with R8100/R9200 and beyond

• Three ports for SD300 wiring (supports redundancy or multiple components)

• Slim profile easily fits inside seat posts or frame cavities

• Waterproof and durable, designed for elite-level shifting systems

• Approximate weight: ~52 g

• Upgraded from earlier BT‑DN110 with no external connectors