I was using the new scheduled departure feature, and took my car to the airport car park for my Thanksgiving trip. I got lucky and scored a charging spot. I left my car's charging percentage on the usual 80%, since I do not have a long drive home from the airport, and I was going to be gone for 4 days.
When I initially arrived at the lot I could not plug in, because there were 2 chargers available for 4 spots, and all were in use. Was not too upset, because even with 4 days of phantom drain, I should still have enough to make it home easily. But I put the j1772 adapter in, and the next morning someone left and plugged me in. I thought cool, now I don't have to worry at all about sentry mode being on. The car finished charging after a few hours, and I checked on it later that evening and saw it at like 84%. I was like that's odd. So I checked on it the next morning, and it was at 88%. The app did not show it as charging, but the % kept slowly creeping up. I checked teslafi, and I could see the range slowly increasing. Before the trip I had noticed some overcharging at home, and I just thought it was a situation where the car battery was cold when I charged it, and after it warmed up in the garage overnight that gave me abit more range. But here, the car was sitting out in the cold all day, and it was cloudy the whole time.
So I was able to call the parking lot and they were able to unplug me, and then it started the slow phantom drain. When I got back home, I saw the same thing happen at home in my garage, it just did not get all the way to 88% because I did not let it sit as long plugged in. I switched back to "start charging at", and that stopped the trickle charging.
I did schedule a service appointment, and they started a text conversation with me(while the car was still at the airport parking lot). They checked the logs and did not see anything wrong, but this was after I had the car unplugged. They suggested what I was seeing was normal, that this can happen where the vehicle has been used in a way where the battery management system does not have a chance to make a calculated amp hour capacity by state of charge open circuit voltage calibration, and that the vehicle needed to rest estimate the actual SOC. It did rest in the airport parking lot for two more days after it was unplugged(sentry was on during this time though). It still did this at home in my garage afterwards, where sentry mode is off.
So if you use scheduled departure and are going to leave your car plugged in and unattended for a few days during the holidays, be careful. My software version is 2019.36.2.2.
When I initially arrived at the lot I could not plug in, because there were 2 chargers available for 4 spots, and all were in use. Was not too upset, because even with 4 days of phantom drain, I should still have enough to make it home easily. But I put the j1772 adapter in, and the next morning someone left and plugged me in. I thought cool, now I don't have to worry at all about sentry mode being on. The car finished charging after a few hours, and I checked on it later that evening and saw it at like 84%. I was like that's odd. So I checked on it the next morning, and it was at 88%. The app did not show it as charging, but the % kept slowly creeping up. I checked teslafi, and I could see the range slowly increasing. Before the trip I had noticed some overcharging at home, and I just thought it was a situation where the car battery was cold when I charged it, and after it warmed up in the garage overnight that gave me abit more range. But here, the car was sitting out in the cold all day, and it was cloudy the whole time.
So I was able to call the parking lot and they were able to unplug me, and then it started the slow phantom drain. When I got back home, I saw the same thing happen at home in my garage, it just did not get all the way to 88% because I did not let it sit as long plugged in. I switched back to "start charging at", and that stopped the trickle charging.
I did schedule a service appointment, and they started a text conversation with me(while the car was still at the airport parking lot). They checked the logs and did not see anything wrong, but this was after I had the car unplugged. They suggested what I was seeing was normal, that this can happen where the vehicle has been used in a way where the battery management system does not have a chance to make a calculated amp hour capacity by state of charge open circuit voltage calibration, and that the vehicle needed to rest estimate the actual SOC. It did rest in the airport parking lot for two more days after it was unplugged(sentry was on during this time though). It still did this at home in my garage afterwards, where sentry mode is off.
So if you use scheduled departure and are going to leave your car plugged in and unattended for a few days during the holidays, be careful. My software version is 2019.36.2.2.
