Di2 battery mount for 30.9 to 31.6 mm seatposts, compatible with Shimano SM-BTR2 BT-DN110

Seatpost battery mount compatibility: Compatible with Shimano SM-BTR2 and BT-DN110 internal batteries for electronic shifting systems, sized for 30.9-31.6mm seatposts to ensure a centered and secure fit.
Replacement: Matches the shape of the original mount to stabilize the internal battery; use as a direct replacement when refurbishing frames or converting bikes to internal battery placement.
Rubber stabilizer sleeve material: Flexible elastomer compresses to reduce noise and vibration, protects the battery surface from abrasion, and maintains seatpost wall spacing without tools or adhesives.
Quick installation and use: Slide the sleeve over the battery, insert it into the seatpost, and route the wiring. Handles road, gravel, and mountain terrain where rough surfaces demand reliable grip.
Application scenarios and users: Ideal for home mechanics, shop technicians, and event support teams; convenient for maintenance, frame swaps, and travel builds using internal electronic transmissions.