Since it was new our 2015 routinely drains the battery when it has not been driven in a few days. I took the car to the dealer about this problem when it was new and they didn’t diagnose the electrical drain, they just replaced the battery with another stock version.
I replaced the replacement battery with a high capacity version which has extended the number of days until drained to ~7. The car has to be left on a trickle charger or it won’t start in a few days. Has anyone else had a similar problem? Is there a solution?