Shimano BT-DN300 Battery

The new DN300 battery comes with 3 ports, delivering stable power to Shimano's 12-speed road derailleur and shifters (if a fully wired option is selected).

With the same size as its predecessor, the DN300 battery can be housed inside seat posts or frames. The 3 port system has simplified wiring to front and rear derailleurs, with the third port being for riders who seek the redundancy of Shimano's 12-speed Di2 wired option.