Shimano Di2 Battery BT-DN110-1 Internal Built-in Type

Shimano Di2 internal battery. Fits e-Tube Di2 groups with EW-SD50 wires. 500 mAH (± 2000km) capacity. Use with EW-WU101 or SC-MT800 interfaces/junction to gain BlueTooth Smart wireless connectivity for on-the-fly adjustments with smartphones and tablets. Requires SM-BCR2 charger, sold separately. Single battery for internal placement within frame or seatpost.