Title says it all. 2013 BMW 328i

I’m not sure how I’m still getting this message after changing my battery. It seems like something is still drawing power but I have no idea what?

I bought an aftermarket screen with a backup camera, but I’m assuming it’s not the culprit since I can’t connect to Bluetooth while the car is off.

After I turn the car off and lock it, im hearing a noise from the engine bay for a decent amount of time (20+ mins).

Any ideas before a synthetic draw is done?