Shimano D-Fly unit compatibility

Deepair12
Deepair12 Posts: 2
edited April 2017 in Workshop
Having just upgraded my Trek Madone with Ultegra 6870 Di2 groupset, I am looking to add the Shimano D-Fly wireless unit.
However I am unsure if this will be compatible with the internal battery - model number: SM-BTR2-1

Any advise greatly appreciated.