I have EW-WU111 so can use the E-Tube app etc. The buttons on the shifters connect to the Wahoo, the gears display etc, it's just that the gear data doesn't seem to get recorded.
But yes, way off topic, will take this to a new thread if needed.
Edited to add: had another look at this. Didn’t change a thing other than to set up a Di2 page on the Elemnt. When I returned to sensor set-up, the option to view / edit chainring size and cassette tooth had appeared - previously it wasn’t there. I have a feeling next time I’ll see some data on the card after the ride - hopefully.
Still no Di2 battery though - there is no field available to select that. Maybe it's only an alert when battery level reaches a certain point?
Edited to add: as I have discovered, it is only an alert on the Elemnt, there is no Di2 battery field to add. You can see the battery level, but not add it as a data field on a page.