How-to Recalibrate your SoH.

[Rik_CT4s]

Pretty happy with the result after the waiting period sitting at 0% and the subsequent charge to 100% (with the results attached).

Now I let the car sit for at least 6.5hrs and check the carscanner results again.

I started the process at 88.16% and currently (pre final check after the 6.5hr+ waiting period at 100%) the SOH reads 89.92%. 1.76% difference. I expected less, so this is a win.

Whatever happened, something did happen!

6mV diff in cell voltage (min-max)
and evenly charged cells.

may i conclude this looks healthy?

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[FrostDrive]

Fair enough. It's not a true zero then by any means.

All it's doing is allowing settling. A pretty minimal effect even for a badly out of balance pack because the cell voltages are much closer at the bottom.

Be very interested in seeing the deltacell minmax before and after 6 hours. TSB feels very much like a fingers crossed and thumbs pressed.

None of this is going to recover much capacity. It's just a service balance.

Tesla service menu does this overnight for you while connected to your charger but its only needed really on LFP cells as the SoC curve is so flat. Much less necessary on NMC.

Feels like Porsche still on the steep part of the learning curve....

Im mostly interested to finding a optimal procudure to do that damage the battery minimal. Staying at 100% is not good for longer times eapecially in hot temperature. But as far as I know staying at 0% is not as bad but its not good so if that is unnessesary I gladly skip it for the 6,5h

 

[Rik_CT4s]

Im mostly interested to finding a optimal procudure to do that damage the battery minimal. Staying at 100% is not good for longer times eapecially in hot temperature. But as far as I know staying at 0% is not as bad but its not good so if that is unnessesary I gladly skip it for the 6,5h

I understand what you are saying but don't forget that the displayed 100% or 0% in fact is not the actual battery state/capacity at that moment. The displayed values are different from true capacities. As such half a day sitting at 100% or 0% wouldn't harm the battery.

 

[FrostDrive]

I understand what you are saying but don't forget that the displayed 100% or 0% in fact is not the actual battery state/capacity at that moment. The displayed values are different from true capacities. As such half a day sitting at 100% or 0% wouldn't harm the battery.

That is a good point, come from Tesla MS world where you see much more of the battery. Especially on the top. Charging from 98-100 then takes an eternity.
(that is a indication that top buffer is low i guess)

 

[Sace]

Feels like Porsche still on the steep part of the learning curve....

In this case I guess the issue is more that people treat the procedure as a maintenance thing which it's not. It's intended to be used if you have doubts about the battery capacity and doing this will relearn the SoH as you also mention.

There should be no reason to do this on a regular basis.

 

[whitex]

That is a good point, come from Tesla MS world where you see much more of the battery. Especially on the top. Charging from 98-100 then takes an eternity.
(that is a indication that top buffer is low i guess)

Had 4 Tesla Model S'es. Tesla 100% is also not actual 100%. Heck, if the BMS determines your battery has aged and there is a potential for thermal runaway, it will lower the definition of 100% (typical user will see it as battery degradation). You can see that when comparing 100% cell voltages between older and newer cars with same model batteries.

 

[SergeyIndy]

may i conclude this looks healthy?

I think what you are showing is a healthy state after SoH recalibration.
I see you have 50k km, so that is a really good SoH level for the mileage.

 

[F1Ruaraidh]

Im mostly interested to finding a optimal procudure to do that damage the battery minimal. Staying at 100% is not good for longer times eapecially in hot temperature. But as far as I know staying at 0% is not as bad but its not good so if that is unnessesary I gladly skip it for the 6,5h

Both are bad in fact a true zero is worse than 100%. But, as posted above, what we see in car as 0, is not really zero or even close!

 

[Vim Schrotnock]

Your battery looks absolutely fine. More worrying when your battery looks like this!

I believe I am in for another battery failure

Definitely, absolutely, positively a bad cell. I had several bad cells and never got an 'error' message of any kind - just noticed a significant drop in range. Really had to bug the dealer to test the battery. They ran it down to less than 5%, and they saw the problem.

 

[F1Ruaraidh]

Had 4 Tesla Model S'es. Tesla 100% is also not actual 100%. Heck, if the BMS determines your battery has aged and there is a potential for thermal runaway, it will lower the definition of 100% (typical user will see it as battery degradation). You can see that when comparing 100% cell voltages between older and newer cars with same model batteries.

Ah yes chargegate!! Remember that well!!

Fact is unless you get a scan tool, most of what you see on the dash on any BEV is just "for indication only"!!

Still have my original Model S as well as the Taycan, in its 7th year now!!

 

[F1Ruaraidh]

In this case I guess the issue is more that people treat the procedure as a maintenance thing which it's not. It's intended to be used if you have doubts about the battery capacity and doing this will relearn the SoH as you also mention.

There should be no reason to do this on a regular basis.

It's much more necessary with LFP....

 

[Sace]

It's much more necessary with LFP....

Sure, that is a completely different story

 

[whitex]

Ah yes chargegate!! Remember that well!!

Fact is unless you get a scan tool, most of what you see on the dash on any BEV is just "for indication only"!!

Still have my original Model S as well as the Taycan, in its 7th year now!!

My oldest Model S was 3 months shy of 8 years when I sold it. If I had an extra place to park it at home, I would have kept it as a spare car, free supercharging, performance, was in great shape.

 

[Berti123]

Did you read out the cell voltages at this low SoC?
I would be interesting to see the delta

 

[Rik_CT4s]

Did you read out the cell voltages at this low SoC?
I would be interesting to see the delta

I did..but I did not make a screenshot unfortunately. To me it looked stable hence no screenshot. Next time i run it low I will. But I have no concern now as I didn't see any weird spikes up or down in any of the cells. Close to 90% SOH seems good to me as well, seeing the 51.000km on the clock now. TS CT

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