pc Battery Mount Seatpost 30.9–31.6mm Compatible with Di2 30.9 to 31.6 mm Compatible with Shimano SM-BTR2 BT-DN110

Seatpost battery mount compatibility: Compatible with Shimano SM-BTR2 and BT-DN110 for electronic shifting systems, sized for 30.9-31.6mm posts to ensure secure centering and retention.
Replacement: Retains the shape of the original mount to stabilize the internal battery; uses as a direct replacement when rebuilding a frame or converting to an internal battery.
Rubber stabilizer sleeve material: The flexible elastomer compresses to reduce noise and vibration, protects the battery surface from abrasion, and maintains the gap with the post walls without tools or adhesives.
Quick installation and use: Slide the sleeve over the battery, insert it into the seatpost, and guide the wiring. Suitable for road, gravel, and mountain biking, where rough surfaces demand reliable retention. Scenarios and users: Ideal for home mechanics, workshop technicians, and event support teams; practical for maintenance, frame changes, and touring builds using internal electronic drivetrains.