Shimano BT-DN300 Di2 Internal Battery

the slim DN300 battery can be housed inside seat posts or frames ensuring a clean aesthetic, With the same size as its predecessor

The new DN300 battery features the same waterproof design that Di2 users have loved for generations

it delivers stable power to Shimano's 12-speed road derailleurs and shifters (if a fully wired option is selected)., Now with 3 ports

The third port is for riders who seek the redundancy of Shimano's 12-speed Di2 wired option.

supplying stable power at all times, the DN300 simplifies wiring to front and rear derailleurs