I was headed out of town for a long weekend (4 days). I was planning on driving my car to the airport and leaving it there. I was concerned about the power drain on my Tesla Y. From my personal experience, I lose roughly 10% off the batter each day even if I do not drive anywhere. This is mainly due to the Sentry Mode.
For those of you who are unaware Tesla’s Sentry Mode is a security feature that monitors your vehicle when it is parked and locked. It uses the vehicle’s cameras and sensors to detect suspicious activity. The reason why it drains the battery so much is that it keeps the vehicle’s cameras and sensors powered on. The Sentry Mode disables itself when the batter drops to 20% or lower.
The way I see it is if you leave your car at 70% for 4 days, then it may be at 40% or thereabouts when you get back. There is a big difference between 70% and 40%!
Absent the Sentry Mode, a Tesla Model Y typically experiences a battery drain of around 1% per day when parked (according to Tesla), meaning the average power drain is roughly 1% of the battery capacity per 24 hours. This is because, the Tesla Model Y is designed to use very little power. There are other factors that could increase the battery drain like leaving on the climate control, preheating the cabin or if it is really cold out.
I turned off my sentry mode and turned off all other features. The result was only about 5% drain over the 4 days. Pretty much what Tesla estimated.
My advice is to turn off all ancillary activities to prolong your battery life if you are leaving your electronic vehicle for any extended period of time.