Why is my battery losing mileage overnight about 10-20 minutes even without my security surveillance off? Is this normal
Did you mean 10-20 miles? not percent right? did you mean "Sentry Mode" by "security surveillance", or the alarm?
I also assume you meant "
with it off", not "
without it off?
If your car is connecting to wifi weakly it could be slow to download an update for the firmware or maps. This would cause it to stay awake longer at night instead of sleeping.
If you got randomly selected as lucky winner in the "contribute some of your driving data to Tesla" sweepstakes, then your car will also spend a lot of time awake sending that data to the mothership.
The more the car stays awake, the more it burns the battery overnight. It's like you, if you wake up a lot during the night, or browse the web all night, you'll be tired in the morning
