SHIMANO BM-DN100 Di2 Battery Mount Internal/External Wire Routing

SHIMANO BM-DN100 Di2 Battery Mount Internal/External Wire Routing 

Compatible with SM-BTR1 External Battery

Short Battery Mount: BM-DN100-S1 has M4 x 10 Bolts Internal/External.
Short Battery Mount: BM-DN100-S2 has M4 x 16 Bolts Internal/External.
Long Size Battery Mount: EW-SD50, BM-DN100-L

For External Battery wire routing, the Battery is not included. 

Original Shimano parts guarantee that all components work perfectly for optimum performance and maximum safety and longevity.