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M:part Di2 Seatpost Battery Mount Internal Post Diameter 24.5mm to 28mm
For seat post ID24.5mm to 28mm or ID20mm to 23mm*Battery and cable not included*
Shimano Sm-ba01 7970 Dura-ace Di2 Battery Mount Adapter
Use if standard mount is not compatible with your bike and you are having problems making the Di2 battery fit try the battery mount adapter.