BM-DN100-S Battery Mount 16mm Bolts
The Shimano BM-DN100-S Battery Mount attaches to standard water bottle cage bosses, giving Di2 drivetrains a dedicated home for an external battery. Its short-length housing fits frames with limited downtube space, and the mount integrates a Bluetooth module for wireless connection to the E-Tube Project app, letting riders check status and adjust settings without disassembly.
Compatible with the Shimano SM-BTR1 external battery (sold separately), this mount supports both internal and external Di2 wire routing for flexible installation. Paired with a wireless unit such as the EW-WU101 or EW-WU111, it enables Synchronized and Semi-Synchronized Shift modes. The kit ships with M4 x 16mm bolts; it is not required for BT-DN110 internal battery setups.
Quick Facts
| Feature | Specification |
|---|---|
| Mounting bolts | M4 x 16mm (S2 variant) |
| Function | Integrated Bluetooth module for wireless E-Tube Project app connectivity |
| Battery compatibility | Shimano SM-BTR1 external Di2 battery (sold separately) |
| Wire routing | Supports internal and external Di2 wire routing |
| Mounting location | Standard water bottle cage boss |
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Product images may vary slightly from final specifications.
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