While searching for some info on the remote app, several folks mention a separate telematics battery ( I guess for backup). As in a little battery in the center console. Does the X351 have a separate battery for telematics? Had no idea? Do you replace it? Thank you.

 

What year vehicle

 

Oh sorry, thought it was in my signature
2016
thanks for any help

 

I think the battery you are talking about is the small one that is fitted into the TCU, telematics control unit. This is to ensure that the emergency response facility always remains active, the unit is located either behind the rear seat or boot on the Uk nearside. You’ll need to research for further info.