I would leave the car plugged in, set to charge to 50%. If you know you will be needing the car the day or day after you return home for extended driving, you can log in the day before you will be home and bump it up to whatever you normally need for daily driving, etc.
It will not hurt the car to leave it plugged in, and it might save you some aggravation. As Elon says, "A plugged in car is a happy car".
Here is why:
I recently had a friend that just purchased a new MY RWD tessie last week, and she sent me this message by text:
"Charged to 80 and its at 73 overnight. Why?"
She said after the car was finished charging she unplugged it. I am not sure if she has cabin overheat (SE Florida), Sentry Mode, etc., turned on. I will check with her on these potential issues and try and help her get it sorted.
I never really noticed this before but being a curious person this got me to looking at so called phantom drain on my MX and M3, and I noticed that I was getting what I consider a lot on my MX. I consider more than 1 or 2 percent a day a lot if the things that keep the car from sleeping are all turned off, and I do not precondition since I am not in a cold climate, and I have Sentry mode turned off when the car is at my house.
This first photo shows 4.4% "preconditioning" whilst the car was parked over the weekend (this is from last weekend), and not driven until Monday morning at 8AM. As I said, I do not precondition (Schdule>Departure>Precondition=Off), but it did charge from 44% to 70% starting at midnight on Saturday. Perhaps it had to cool the battery after charging? The car is parked in a garage in SE Florida (a little north of Ft. Lauderdale), temperature was in the 70's. Not sure why there was any Sentry mode usage as that was definitely turned off.
After I drove it a little on Monday morning, I noticed the following drain while the car was parked, again at my house, from about 9 AM to 12 Noon. Almost 2% in 3 hours!
My Tessie app suggests turning off data sharing, which was on, so I did turn all these off before my last charge.
So with all these data sharing items turned off, the car was last charged from 34% to 70% starting at midnight on Saturday morning, it is now Sunday about noon, ~36 hours later. Note I had left pre-conditioning on in the app (Schedule>Departure>Precondition), which I don't normally have on because my car is kept in an air conditioned garage in SE Florida. I left it on as an experiment to be sure it would properly record any preconditioning in the energy app, and it did.
So 4% vehicle standby in just about 36 hours.
I will be turning all these data sharing items back on as they do not seem to make any discernible difference in energy usage.
For the above reasons, I would routinely leave the car plugged in, when being gone for any extended period of time, but it might be a good idea to leave the car for a day or two, or more if you are not driving it, and just see what your phantom drain is. The following two threads show that this can become excessive and be caused by software and/or hardware problems.
Meanwhile I am going to look into why my car is draining more than 1-2% a day when it is sitting in my garage with Preconditioning and Sentry Mode turned off.
New here, came to post this. I had my 22 M3 RWD LFP RCM replaced in Norcal this week due to the same issue. 8 to 10% Vehicle Standby battery drain after parking overnight in my garage. I had a camera in the garage right next to the car with sound event detection enabled and sensitivity on high...
teslamotorsclub.com
Day 29 + 4 weeks: Well, my car actually lost about 20 miles the first week after I got it back, including 8 miles the same afternoon I drove it back from Tesla service. It does indeed seem better now. But this car's problem seems to never end. Last week, one of my tires lost 10 lbs. This is the...
teslamotorsclub.com
After reading the above threads, which takes a while, I have a new appreciation for how complicated these tessies really are.