I have that on the Born, not sure what its for just not got round to trying to search, the app for the Born says it's about using the HV battery to ensure all of the remote features continue to work rather than the car disabling them if the 12v is low (I assume).V3 in car, and I think 2.2.15 app
Could be related to things like being able to lock/unlock and other features like that, ensuring that there is always power available to do it (which are currently unavailable for the Born)?