Shimano BMDN100 Di2 Long Battery Mount for External Wiring

Shimano BMDN100 Di2 Long Battery Mount for External Wiring. Shimano Di2 External Battery Mounts

• All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions
• Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/