Battery preconditioning ?

[kimwin]

After charging the battery to full (overnight), I disconnect the charging cable.
Everything seems normal.
15 min later , I walk in the garage, my M3 starts a humming sound (which I have heard many times previously)
Q1: does the car think I am about to drive it so it precondition the battery ? If not, what could cause this ?
Since I do not drive the car yet, I turn off Blue Tooth on my cell phone. Then wait for 30 min, walk near the car again. No sound which is what I expected. Does this make sense ? If it does, that means I should only turn ON blue tooth when I am about to drive the car.
Battery preconditioning consumes quite some percentage of the battery.
Attached the energy charts showing where the energy goes since the last full charge.

 

[Gasaraki]

You can turn off preconditioning or Cabin Over-Heat protection.

 

[macewank]

The car isn't going to precondition the battery unless you set nav to to a supercharger, manually enable it (via 3rd party tool), or set a planned departure time.

 

[Benito1283]

Might’ve been cooling the battery pack after charging. Especially if you charged to 100%. Full battery + heat = no bueno.

 

[kimwin]

Might’ve been cooling the battery pack after charging

This humming also occurs after finishing a trip and park in the garage. I hear the humming for a good 5 mins.
Cooling the battery makes sense.