SHIMANO Battery (Di2 spec) BT-DN300 Internal battery 7.4V 3.7Wh

With the same dimensions as its predecessor, the slim DN300 battery can be housed in seatposts or frames, ensuring a clean aesthetic. Now featuring three ports, the DN300 simplifies wiring to the front and rear derailleurs, providing stable power. The third port is for those who want the redundancy of Shimano's 12-speed Di2 wired option.

・Compatible with the new generation thinner electric wire SD300 and systems after the R9250/R8150 series

・3 SD300 ports

・Fixing method shared with BT-DN110