Shimano Di2 Seatpost Battery HolderTwo piece resin battery holder for internal Di2 battery installation Compatible with both BT DN110 (11 speed) and BT DN300 (12 speed) Di2 batteries Flexible fin design accommodates minor diameter variations within size range For round seatposts only Diameter: 27. 2 28. 6mm (seatpost external diameter) Color: Black 8 grams
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product description
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Two-piece resin battery holder for internal Di2 battery installation
Compatible with both BT-DN110 (11-speed) and BT-DN300 (12-speed) Di2 batteries
Flexible fin design accommodates minor diameter variations within size range