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Vampire battery drain while parked
- Thread starter danakchandler
- Start date
Now that I think of it, I am probably just catching it when the car is kicking on to charge the lead acid 12v and it turning on has nothing to do with the cold. I do end up with somewhat melted squares where I park on my driveway though. Maybe its residual heat from before I parked or snow not continuing to accumulate under the car like it is around it and I never really thought about it.
I am going to take the temperature of my battery in the cold and see if it's same as ambient one day.
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I've been fighting this recently as well. For the past week, my car has been losing more than 1% per hour while parked at work.
Through discussions with tesla, they have narrowed it down to remote requests, but I don't have any. I was using the IOS widget for the battery, but have turned that off with no effect.
Last Friday was pretty cold (-20c), so Tesla wanted to blame it on that. Today, we're hovering right around 0c and my car used 4% in 3 hours.
No FSD, no accounts linked.
I'm thinking this must be a software issue, as last year in the same conditions I'd maybe lose 1% per day parked.
Through discussions with tesla, they have narrowed it down to remote requests, but I don't have any. I was using the IOS widget for the battery, but have turned that off with no effect.
Last Friday was pretty cold (-20c), so Tesla wanted to blame it on that. Today, we're hovering right around 0c and my car used 4% in 3 hours.
No FSD, no accounts linked.
I'm thinking this must be a software issue, as last year in the same conditions I'd maybe lose 1% per day parked.
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AlanSubie4Life
Efficiency Obsessed Member
Ignore what happens for the first 10 hours or so. Then check what happens subsequently. Will help determine if static or transient (BMS adjustment). So check after 10 hours, check after 20, 30, etc.
1% per hour is a minimum of 500W (750W for large pack). So it is not an idle/sleep problem.
If the car is dead silent with contactors open that of course points to BMS too.
Should be easy to figure out if normal or a bug or misconfigured.
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AlanSubie4Life
Efficiency Obsessed Member
Just as an example of why to ignore the first few hours:
I gained 7 rated miles just sitting today, over 8 hours, as the temperature went from 64F to 60F. Car was in a parking structure.
So good to just ignore that stuff when it is the sort of thing that should be ignored (this is all made clear in the Energy App, which will tell you what you cannot ignore!).
Note that the energy app does not provide negative loss values. So if you gain miles it just says zero rather than negative values. To be fair, you need to count such instances as negative values over the long term to determine your actual vampire drain average. In this case, my car was producing 200W while parked (obviously not really).
You can see the historical shifts at each parking instance since the last charge by just looking at the energy vs. time since last charge.
I gained 7 rated miles just sitting today, over 8 hours, as the temperature went from 64F to 60F. Car was in a parking structure.
So good to just ignore that stuff when it is the sort of thing that should be ignored (this is all made clear in the Energy App, which will tell you what you cannot ignore!).
Note that the energy app does not provide negative loss values. So if you gain miles it just says zero rather than negative values. To be fair, you need to count such instances as negative values over the long term to determine your actual vampire drain average. In this case, my car was producing 200W while parked (obviously not really).
You can see the historical shifts at each parking instance since the last charge by just looking at the energy vs. time since last charge.
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Interestingly, I am also losing about 10 to 15 miles of range overnight per the energy "parked" screen. I have sentry off at work and home and still see the issue. I'm beginning to agree this is a software issue as I never saw this previously. It's annoying, because I purchased this vehicle to be green. And wasting electricity while the car is parked is NOT green. Just like an ICE vehicle, there should be little to no loss of energy when the vehicle is sitting there doing nothing.
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AlanSubie4Life
Efficiency Obsessed Member
It’s likely just a BMS adjustment if the energy screen says it is vehicle standby, and the car is sleeping. You’ll likely get it back at other times. Just keep an eye on those rated miles at each sleep cycle. Sometimes it goes up!
All averages out, and it is not more than 10W-15W or so average power (which is ridiculous but nothing like what you quote) when working properly.
There could be software bugs but jumps in energy up and down when stationary and sleeping are perfectly normal. Can be 5-15 rated miles.
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I think it is a software issue...
I've had the MY for 3 years and it has never drained battery on park unless something was keeping it awake (sentry, 3rd party app, etc).
The car does go into Deep Sleep and still drains, there is some kind of issue that tesla is unaware of.
For everyone saying this is normal, sorry but you are wrong.
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Yes, agree! But if the app in Android is constantly running on the background might be because it isconstantly checking the car, that's my point... In Android you can limit the background use of any app, might be a good idea to do that...
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And I am telling you that the app will NOT keep the car awake unless you actively open it / bring it in the foreground 
. It is not checking the car. Even the widget isn't keeping the car awake, those two things have been verified by multiple people.
. It is not checking the car. Even the widget isn't keeping the car awake, those two things have been verified by multiple people.
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Really? Appreciate you sharing, I'm a new Tesla owner.And I am telling you that the app will NOT keep the car awake unless you actively open it / bring it in the foreground
I will keep my widget them, thanks
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I can also confirm this. I recently left my car untouched while the phone up is running in the background for 36 hours. The car had been continuously asleep (as far as I could tell from non-wake API calls) until I brought the phone app foreground, and the car screen said battery drain was 0.5%.
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Sky Force is my jam. When the sound doesn't work, just start a different game and then switch back to Sky Force. You don't have to wait for the other game to start, just a few seconds of loading to ensure Sky Force will be fully unloaded.
This method works reliably and is *much* faster than a soft reboot.
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