Universal Cycles -- Shimano BM-DN100-L Bluetooth Di2 Battery Mounts [IBMDN100LB]

Shimano BM-DN100 Di2 Battery Mount Short, Int/Ext Wiring, M4x10 Bolts 689228417793

Shimano Di2 BM-DN100-S Battery Mount short internal/external routing Accessories Di2

Universal Cycles -- Shimano BT-DN300 Di2 Internal Battery [IBTDN3002]

Shimano Di2 Battery, BT-DN110-A, Built-in type - Mariposa Bicycles

SHIMANO Internal /External Wire Routing Short Size Battery Mount

If you have an external wired set-up and want to change your older Shimano Di2 drivetrain to a Bluetooth wireless interface,

Shimano Di2 BM-DN100 Short Battery Mount

Shimano Di2 Battery Mount BM-DN100 Short Internal/External Routing - IBMDN100S1 for sale online

Shimano Di2 Battery Mount BM-DN100 Short Internal/External Routing - IBMDN100S1 for sale online

SHIMANO BM-DN100 Di2 Battery Mount : : Sports & Outdoors

BM-DN100-S, Battery Mount for EW-SD50, Short, for External/Internal Battery Cable Routing : : Sports & Outdoors