This product has been designed, built and tested by a Pinarello owner with over 3000kms logged. Product is also available for the Campagnola V3 battery.
Shimano BTDN110A1 Internal Battery Groups DI2 ETUBE 110A1 R, Black, 1
Shimano Di2 Battery Mount BM-DN100-S Short Internal / External Routing
M:part Di2 Seatpost Battery Mount Internal Post Diameter 24.5mm to 28mm
M:part Di2 Seatpost Battery Mount Internal Post Diameter 20mm to 23mm
Shimano SM-JC41 Ultegra Di2 Internal – Connection Box – ismjc41