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Battery Damage after Sitting @ 0% for 1 or 2 Weeks

Matias

Active Member
Apr 2, 2014
3,209
3,551
Finland
Battery has anti bricking reserve, which is nor available or visible to user. So when battery reaches 0%, it in reality is not 0%. Also car goes to “deep sleep”, if charge drops too much (if it sits on 0% charge long enough). In that deep sleep it consumes very little energy. IIRC Model S can stay about 2 months in this deep sleep without any damage. If car is in this state, it needs service to power up.
 

kbecks13

Active Member
Dec 27, 2017
1,912
2,261
SoCal
YOU, created that problem by checking on the car and waking it.

Lol so you're saying if i hadn't opened my app (which i kinda have to do when driving my current Model 3) that the car would magically keep its charge for months at a time? :rolleyes: Sure...

Regardless my point is that Tesla themselves do not take good care of the cars they buy back from customers, me opening the app does not change how Tesla stores the cars in a remote lot for months without any charging.
 

SSedan

Active Member
Jul 24, 2017
2,948
2,306
Greenville Wisconsin
I am sure you could have a car removed from your account.

It is well known that waking the car causes excess phantom drain.

Edit.
Tesla Account Support'
Scroll down to transfer ownership.
When I googled the page actually came up with the applicable lines highlighted as the first search result.
 
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kbecks13

Active Member
Dec 27, 2017
1,912
2,261
SoCal
I am sure you could have a car removed from your account.

It is well known that waking the car causes excess phantom drain.

Edit.
Tesla Account Support'
Scroll down to transfer ownership.
When I googled the page actually came up with the applicable lines highlighted as the first search result.

Guess what - 2 years ago they didn't have this, pretty sure they made it after realizing how rampant their internal problem of transferring ownership was. Also not really my job to do that nor should i really care, again just pointing out the negligence on Tesla's side.

It is also well known that the cars will naturally deplete their battery over a period of months sitting unplugged, thats why the manual is so explicit about leaving them plugged in.
 

CertLive

Member
Dec 15, 2019
612
367
United Kindom
Maybe most of the second hand cars sell so fast its rare to see them run out before landing in the next owners hands... at the moment this is highly likely or you can rig them all up to a household outlet like this one.

FDABEB85-C958-4BE7-BCC7-6A3B51651436.jpeg
 

Glamisduner

Active Member
Aug 2, 2017
3,581
2,117
Escondido, CA
I think your probably fine. I mean it would certainly not be good for wear, but wear is different than damage. Otherwise your damaging the battery every time you use it. Which I guess you are, but only as wear :)
 
Oct 31, 2019
239
301
Georgia
OP, if you haven’t pulled the trigger yet...

I just sold my SR+ to Carvana yesterday and took delivery of a 2020 LR AWD (non FSD) with 2,700 miles the same day for $43,300, directly from Tesla. I went through my Tesla sales advisor that helped me with my first car - he found the car in their “database”. They’re out there...

Whats the VIN? I sold my ~2300 LR RWD back to Tesla back in June 2018 to get a Performance Model and they took a few MONTHS to remove it from my account. Over that time, i could see that they left the car sitting in a lot for weeks on end and eventually the battery died when i could no longer see what it was doing which was pretty surprising.

You can remove the car from your account yourself by logging into your Tesla account. (EDIT: just saw that the removal option wasn’t around when you did this - apologies)

First thing I did when I sold mine, 5 minutes after it drove off, as I didn’t want to be dealing with supercharging fees that are not mine.
 
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Candleflame

Active Member
Mar 9, 2015
2,389
1,100
QLD, Australia
The car discharges at 1% per day if left unplugged and more if sentry is activated. I would check when the car was taken into their possession.

Model 3 has a VERY efficient sleeping pattern. If you dont wake the car it only wakes up every 3 days or so for a couple of hours for battery/12v battery management. when its in deep slumber it consumes 5-6w. The only real consumption occurs when it does eventually have to wake up to recharge the 12V battery which takes around 90min and wastes like 300 watts unfortunately. Sometimes the car does wake up randomly - I think its mainly doing BMS stuff then.
 

UncleCreepy

Member
Mar 29, 2020
169
270
Lunenburg, ON
Once the car drains to 20% it shuts down a lot of functions.
Do you mean while it is parked and at less than 20%?
I'm asking because I recently drove 6,000 miles in two weeks and I repeatedly drained the battery to 4% but nothing shut down. Obviously the acceleration was impacted at a very low SoC, but A/C and infotainment were still working as usual. Nothing seemed to have changed at <20%.

Which "lots of functions" are you referring to? I only know that you can't keep the HVAC system running when you park your car at <20% SoC.
 

camalaio

Active Member
May 28, 2019
1,483
2,082
Vernon, BC, Canada
Do you mean while it is parked and at less than 20%?
I'm asking because I recently drove 6,000 miles in two weeks and I repeatedly drained the battery to 4% but nothing shut down. Obviously the acceleration was impacted at a very low SoC, but A/C and infotainment were still working as usual. Nothing seemed to have changed at <20%.

Which "lots of functions" are you referring to? I only know that you can't keep the HVAC system running when you park your car at <20% SoC.
It only disables things when in Park, yes. You lose Sentry Mode, Summon Standby, climate control, and by extension Cabin Overheat Protection. That's really about it.

At very low SoC (around 5% I think), the service manual says it stops charging the 12V battery too, so you don't want to store it like that for very long (for many other reasons as well, of course).
 
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JBT66

Member
Oct 26, 2018
579
344
Arizona
Do you mean while it is parked and at less than 20%?
I'm asking because I recently drove 6,000 miles in two weeks and I repeatedly drained the battery to 4% but nothing shut down. Obviously the acceleration was impacted at a very low SoC, but A/C and infotainment were still working as usual. Nothing seemed to have changed at <20%.

Which "lots of functions" are you referring to? I only know that you can't keep the HVAC system running when you park your car at <20% SoC.


Yes I mean while in Park. Nothing stops working while driving beyond a bit of loss of performance.
 
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Fernand

Active Member
Mar 22, 2019
1,464
1,457
Northern california
Guy, guys. They just landed the Dragon after a 2 month joyride up to the International Space Station. You don't think the Musketeers put some brain cycles into managing the Tesla vehicle batteries? I wouldn't worry about it. If it's the car you want, at the price you like, get them to deliver a running machine, get a monitoring app, and observe as you charge it up. As long as it wasn't parked in a swimming pool, I'd bet it's just fine.

That waking-by-checking behavior is like the Heisenberg Uncertainty Principle. Can't observe it without affecting it.

Just make sure the car's not forever locked in Valet Mode, as a punitive action against the previous owner :)
.
 
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medphys3

Member
Feb 10, 2020
41
17
Northwest Ohio
Guy, guys. They just landed the Dragon after a 2 month joyride up to the International Space Station. You don't think the Musketeers put some brain cycles into managing the Tesla vehicle batteries? I wouldn't worry about it. If it's the car you want, at the price you like, get them to deliver a running machine, get a monitoring app, and observe as you charge it up. As long as it wasn't parked in a swimming pool, I'd bet it's just fine.

That waking-by-checking behavior is like the Heisenberg Uncertainty Principle. Can't observe it without affecting it.

Just make sure the car's not forever locked in Valet Mode, as a punitive action against the previous owner :)
.

I like the way you think :)
 

android04

Member
Apr 1, 2016
337
322
Crete, Nebraska
Model 3 has a VERY efficient sleeping pattern. If you dont wake the car it only wakes up every 3 days or so for a couple of hours for battery/12v battery management. when its in deep slumber it consumes 5-6w. The only real consumption occurs when it does eventually have to wake up to recharge the 12V battery which takes around 90min and wastes like 300 watts unfortunately. Sometimes the car does wake up randomly - I think its mainly doing BMS stuff then.
Which is probably why we are seeing so many 12v battery failures. Every 3 days is likely not enough to keep it charged and people aren't driving as much due to the pandemic. I recommend on all the posts about 12v battery failures to use the car for at least an hour every 2 days (Netflix, Spotify, or a game) to keep the car on and charging it.
 
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Candleflame

Active Member
Mar 9, 2015
2,389
1,100
QLD, Australia
Which is probably why we are seeing so many 12v battery failures. Every 3 days is likely not enough to keep it charged and people aren't driving as much due to the pandemic. I recommend on all the posts about 12v battery failures to use the car for at least an hour every 2 days (Netflix, Spotify, or a game) to keep the car on and charging it.

obviously unrelated as that dosnt matter as per my post. the battery is either empty and needs recharging or not. in model 3 that happens later in the model S it happens earlier.
 

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