Shimano BT-DN300 Adapter Unit

You need this adapter set to mount the BT-DN300 Di2 battery inside a round seat post. As a result, it sits securely and does not loosen even on jogging slopes.

Specifications
Material: Plastic, Aluminum
Compatibility: Shimano BT-DN300 Di2 battery
Color: Black

Mfr Claimed Weight
TBC