Shimano Built-in BT-DN320 Battery for XTR Di2 Wireless Rear Derailleur

The Shimano Built-in BT-DN320 battery represents a significant step forward in Di2 technology, eliminating the need for a central power supply and bulky wiring. With a capacity of 305 mAh and a nominal voltage of 7.6 V, this lithium-ion battery integrates directly into the Shimano XTR Di2 RD-M9250 rear derailleur, ensuring a constant, reliable power supply.

Its compact, waterproof design (29 x 22 x 18 mm, 23 g) keeps it out of sight and protected against water ingress, while remaining easy to remove for charging. This solution improves the bike’s appearance and simplifies installation, offering high-level performance for demanding cyclists.

Founded in 1921 in Sakai, Japan, by Shozaburo Shimano, Shimano is still based in the same city today. For cyclists, it makes drivetrains, brakes, wheels, pedals and cycling shoes. Its history in bicycle components began with the production of freewheels in 1922.