Shimano Di2 BT-DN320 Wireless Rear Derailleur Battery

- The power house of Shimano wireless Di2 is a long-life 310mAh Li-Ion battery that is both compact and reliable, taking shifting effort away from you
- Excellent sealing and reliability have been proven through repeated field tests in various riding conditions, including extreme temperatures, rain and mud
- The use of a small and discreet integrated battery is light weight, efficient and creates a robust and reliable system
- One charge gives a 340 kilometre range depending on conditions thanks to its power-saving battery management system
- Charging is done via EC-DN100 charger