Shimano Di2 Battery BT-DN300 Seatposts The perfect reference guide for

The perfect reference guide for nearly any level mechanic and every bike

Wear the Flash Reflective Sock on your daily commute or on any ride that will start early or finish late

Intuitive shifting control

and encased in an ultra-durable Grilamid TR-90 frame

Shimano Di2 Battery BT-DN300 Seatposts The perfect reference guide forThe new Shimano Di2 BT DN300 battery features the same waterproof design that Di2 users have loved for generations. Now with 3 ports, it delivers stable power to Shimano's 12 speed road derailleurs and shifters (if a fully wired option is selected). The same size as its predecessor, the slim DN300 battery can be housed inside seat posts or frames ensuring a clean external aesthetic. Now with 3 ports, the DN300 simplifies wiring to front and rear