I'm starting to see some overnight battery drain, around 1% which is not something I have really noticed in the past 10 months. No sentry mode, not checking the app, nothing plugged into usb, indeed not doing anything different. I am going to raise a service request (probably a waste of time) but just wondered if there were any thoughts about this, especially relating to recent software updates. I'm on 2022.28.2 and while I cant say for sure that this coincided with this update, it is one of the only things that I am aware of that has changed.
I could also add that I still intermittently get the (SOS E-Call not available, check cellular connection) or words to that effect warning. Car has previously been in for this as I had it a few times and could not connect from the app. I'm now also seeing this sometimes while driving and was wondering if there was a problem with the cellular connectivity when the car is sitting parked, causing increased battery usage. Just a thought
Everyone else on this thread appears to be missing the point-
It was better before, and something changed to make it noticeably worse.
I wish people would stop saying "you're holding it wrong." In any case, I'm here to report that I've seen the exact same change in behavior, where the vampire drain was miniscule, to it now being noticeable. In my case, the only thing of note that changed is a software version. I live in Northern CA, so I think we can agree that temperature is not relevant.
I use TeslaFi, so I can can actually put numbers on what changed. TeslaFi reports a vampire drain/phantom battery drain number. Back in April, that number was 0.04 mph (0.2 kWh) of sitting. So in 10 hours, I'd lose 0.4 miles, 100 hours, 4 miles of range lost. My car could sit for weeks without being used during covid times, and lose a couple of percent of range.
My current TeslaFi reading shows the lowest it ever gets now is 0.08 mph, and averages 0.13 mph.
So vampire drain is now 2x to 3x worse than it was.
This might be only our cars, but it's very helpful to know that someone else sees this problem as well. No, it's not a catastrophe, but all things considered, I'd rather have it be be the way it was. My car is not waking up at night. TeslaFi shows that it can actually go several days without waking.
I contacted Tesla support, and talked on the phone with a very nice guy, but of course we also did not solve the problem. I did not mention that I use TeslaFi- if you ever mention this to their support people, they drop you like a hot rock. The good part is he checked out my car logs and does not see any problems. The bad part is we did not successfully solve it.
My guesses-
1) Something changed in the software that is not as smart as it was. Some sloppy coder broke a finely tuned mechanism that keeps the vampire drain low. It's really easy to break stuff like this in software. My current version is 2022.20.12.1. Last April I was running 2021.44.6.
2) My 12V battery is getting crufty. 2.5 years old, we know they have a history of going belly up after 2 years. Tesla tech said mine checks out fine from software/log perspective, but I think we can agree their monitoring software is not exactly stellar when people report being stranded.
3) Battery pack rebalancing. There is a possibility that the pack is getting far enough out of whack that it is trying to rebalance, and that process burns just a bit of energy to rebalance the cells. My car has higher than average loss of range on 3500 total miles, so this is possible.
I've tried many experiments over the last month, including stuff like turning off TeslaFi, turning off bluetooth on my phone. No WiFi, anything that might wake it up. Nothing so far. Current experiment is to leave the battery below 20%, where the software disables everything. And also provides the pack with a better low number for rebalancing. Not promising so far, last phantom drain number was 0.09 mph. But I'll report back.