Battery keeps dying

[Lonergan]

The fairly new battery in our 2015 5.0 keeps dying overnight. When I try to start it, some electrical component activates on its own (usually the rear window power shade, but once it was the HVAC system) but the car won't start. I assume there's a short or some type of electrical drain happening.

Ant ideas? Our nearest Genesis dealer is now 2 hours away.

 

[joegr]

To get good help, more information is needed.

What is the battery voltage when you park the car (last time before overnight)?
What is the battery voltage just before and just after you attempt to start it?
What is the battery voltage while the engine is running?
Has the battery been (load) tested?

Are you jump starting it each time after this happens?