SHIMANO BT-DN300 Di2 Internal Battery

The slim DN300 battery is the same size as its predecessor and fits inside the seatpost or frame without compromising the bike's aesthetics. The DN300 battery now features three ports for easy cable routing to the front and rear derailleurs, ensuring consistent power at all times. The third port is for wired connection to the Shimano 12-speed Di2 system.・Compatible with the next-generation, thinner SD300 electric cable and systems introduced after the R9250/R8150 series・Three SD300 slots・Same mounting method as BT-DN110