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Will Supercharging shorten the battery life?

jerry33

(S85-3/2/13 traded in) X LR: F2611##-3/27/20
Supporting Member
Mar 8, 2012
20,356
26,791
Texas
At best SCs charge at a rate of 1.4C when the battery state of charge (SOC) is low. It rapidly reduces from there. The best information available indicates that severe degradation happens above 4C (This is battery temperature dependent). The Battery University says:

"Today, the Tesla Model-S uses Lithium Nickel Cobalt Aluminum Oxide (NCA), a chemistry that has high specific energy, high specific power and a long cycle count, but it costs a bit more. To reduce stress, Tesla is “super-sizing” the pack. The batteries of the Model S-60 and S-85 are so large that they operate at a C-rate of only 0.25C (C/4), even at highway speed. This allows Tesla to focus on high energy density for maximum runtime and longevity; power density is less important. The negative is increased energy consumption due to a heavier vehicle and a higher battery price."
 

jerry33

(S85-3/2/13 traded in) X LR: F2611##-3/27/20
Supporting Member
Mar 8, 2012
20,356
26,791
Texas
What makes you say this when there is not a single documented case of Supercharging shortening battery life?

Well, I don't doubt that if you compared a car that only charged at 16 amps to one that used Superchargers for every charge there would be a measurable difference. However, measurable and significant are two different animals. And even if you never drove the car and left it at 50%, there would still be degradation due to aging. Bottom line is: Don't worry about it and have fun driving it.
 

jerry33

(S85-3/2/13 traded in) X LR: F2611##-3/27/20
Supporting Member
Mar 8, 2012
20,356
26,791
Texas
I directly asked tech at my SoC and he told me using the SC "as the primary source for charging" is not recommended by Tesla as its not good for the battery.

That's basically verbatim.

The tech said that, I'm sure, but the problem is that Tesla has sent mixed messages, and have put Superchargers in areas where charging at home is not possible. So, it can't be that bad. I suspect that if you had received an answer from a different tech or a different Service Centre the response would likely not be the same.
 

ecarfan

Well-Known Member
Moderator
super charge shorten the battery life

The tech said that, I'm sure, but the problem is that Tesla has sent mixed messages, and have put Superchargers in areas where charging at home is not possible. So, it can't be that bad. I suspect that if you had received an answer from a different tech or a different Service Centre the response would likely not be the same.
And the OP supports your position with:
will super charge shorten the battery life? I asked this question to several Tesla Employees, some have no idea, some say yes, other say no
However, I do not understand your statement that:
...Tesla has sent mixed messages, and have put Superchargers in areas where charging at home is not possible.
Can you give example?
 

David99

Active Member
Supporting Member
Jan 31, 2014
4,909
7,353
Nomad (mostly US)
Higher charge and discharge rate are more stressful for the battery and will shorten life. They question is: by how much. There Has been a long term study with Nissan Leafs. One only charged normal, one only charged on CHADeMO. Now the Leaf has no thermal management and since the Leaf battery is so small that the charge rate relative to the battery size is actually higher than a Supercharger. All these things cause more stress on the battery. Yes the difference in capacity loss between the testes cars was very small compared to the overall capacity loss. So the most extreme case (charging fast all the time) and much worse conditions compared to the Tesla didn't have a big negative impact on the battery.

The Tesla on the other hand has excellent thermal management. It is much more careful with fast charging. S it is a given that the difference would be much less. In other words, do not worry about Supercharging your Tesla. Even doing it a lot won't make a significant difference.

So the answer is, yes Supercharging is worse for the battery than normal charging. But the difference is so small that it should not be a concern.

Here is the study
 

BertL

Active Member
Aug 19, 2015
2,018
1,580
Carlsbad, CA
Supercharging frequently at your local supercharger will definitely shorten battery life. Supercharging frequently out of town will have no appreciable effect.
Sorry, I hate to add nonsense to what may have been intended as a clever tongue-and-cheek reply, but OTOH if this was intended as something helpful, I must say: "WHAT? How does the Supercharger location have anything to do with it?"
 

Max*

Charging
Apr 8, 2015
6,672
3,835
NoVa
Sorry, I hate to add nonsense to what may have been intended as a clever tongue-and-cheek reply, but OTOH if this was intended as something helpful, I must say: "WHAT? How does the Supercharger location have anything to do with it?"

Tesla has a very good algorithm that can detect when you're supercharging close to home, with 99.999999% accuracy, and they intentionally send a signal to the car to tell it to shorten the battery life. Or aliens. I always get confused between the two...
 

TexasEV

Well-Known Member
Jun 5, 2013
7,652
8,918
Austin, TX
Sorry, I hate to add nonsense to what may have been intended as a clever tongue-and-cheek reply, but OTOH if this was intended as something helpful, I must say: "WHAT? How does the Supercharger location have anything to do with it?"
Of course my reply was tongue-in-cheek, and I'm glad you thought it clever. Wouldn't it be great though if we could actually convince some owners that it was true? It would end overcrowding at several California superchargers for sure.

- - - Updated - - -

I guess the other question is, how "full" does one charge when using an SC. I would imagine charging to 80% wouldn't be that bad, but going to 90+% might cause some (slight) damage.

.
There is no reason to imagine that. That is what the taper is for.
 
I asked my service center the same question and was told that any impact would be insignificant. I was then told that supercharging will likely have more of an impact on the battery cooling pumps which are working hard if you are charging from a low SoC allowing SC to work at full power. You can hear the pumps roaring.

Does anyone know if these are covered under the battery warranty or not? I suspect not.
 

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