How-to Recalibrate your SoH.

Dee

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I spoke to a technical friend of mine and he knows a thing or two about Porsche.

If your SoH may look lower than expected you can recalibrate the battery.

Porsche uses the following method [edited]
-Drive the battery below 2% SoC.
-Don't drive or charge the car for at least 6,5 hours.
-Recharge to at least 95% SoC.
-Don't drive or charge the car for at least 6,5 hours.

I'm about to recalibrate my battery so I'll post the results.
According to Carscanner my battery is at 89,5%@40.000 km (never did the 0 km test when it was new though).
I've started measuring SoH in 2022 at 15.000 km or so, which was already down to 90,3% SoH.

To be continued.

Porsche Taycan How-to Recalibrate your SoH. Screenshot_20220806-190832~2



Edit: conclusion on post #29
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I’ll be interested in your results. I’ve tried it a couple of times but seen no change
 

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Porsche uses the following method:
-Drive the battery below 20%
-Don't drive or charge the car for at least 12 hours.
-Recharge to 100%.
I think I read something similar on this forum before. It also mentioned that after charging to 100% you need to leave it overnight.

I have the feeling I also need some calibration. Last week I charged to 40% but after few kms checking my SoC it was 44%..
 

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OP, this is not the correct procedure. The correct procedure is in post #3 with reference to the TSB.

I just recently did this and you have to drive the battery way down to 2%. I was able to gain about 1.5% back, but then it did not last too long and in the next 1k miles or so it went back by 1%, see my metrics below. I think the rebalance is a good thing to do may be every 10k miles to keep the cells healthy and also look for any outliers that can be noticed when you do a deep discharge/hold/charge.

Porsche Taycan How-to Recalibrate your SoH. 1725727976985-dl
 


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@Dee, you are saying in the first post that your first measurement was 90.3% at 15k km and then you are now at 89.9% at 40k km? Interested to see what you get after proper recalibration. My trend has been 5% loss in the first 1k miles then down to 92% at 10k miles.
 
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@Dee, you are saying in the first post that your first measurement was 90.3% at 15k km and then you are now at 89.9% at 40k km? Interested to see what you get after proper recalibration. My trend has been 5% loss in the first 1k miles then down to 92% at 10k miles.
It is known that degradation is faster at the beginning, after that the gradient is much more flattening.
 


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Ok, I drove around to get it to <0%...
That was a bit uncomfortable although I know there's a few kms left in there...😱
Woke up the turtle mode.
Porsche Taycan How-to Recalibrate your SoH. Screenshot_20240910-195838

Although it read 0% it now shows 1% again.
I'll let it rest for at least 6,5 hours.😴

To be continued.
 

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@Dee, the point of the recalibration is to also detect any issues, and looks like you may have run into one. 0% display means 5% left actual. Now when you get to the end and measure SoH and other cell data, it will be interesting to see if you have any anomalies such as outlier cells in Voltage or SoH level.
 
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@Dee, the point of the recalibration is to also detect any issues, and looks like you may have run into one. 0% display means 5% left actual. Now when you get to the end and measure SoH and other cell data, it will be interesting to see if you have any anomalies such as outlier cells in Voltage or SoH level.
No, I haven't.
According to my information, the 0% is actually 10% left.
Anyway, 0% is not 0%, correct.

About the 1% "coming back":
Cuz you squeeze out the juice of the battery it means it's under stress (heat, voltage drop, etc).
When it sits at peace it'll accommodate and a value of 0,49% will be show as 0% on the display but when this value increases by just 0,01% it'll show 1%, you understand?
Bedsides, yesterday it went from 15 to 16 after my run on the highway, nothing new.
And I already keep track of my individual cells.
They're ok.

Porsche Taycan How-to Recalibrate your SoH. Screenshot_20231229-225929

According to this perfect balance I don't expect that my SoH will improve.
We'll see in a day or two...

PS This is not 100% SoC, old pic.
 
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And I already keep track of my individual cells.
They're ok.

Screenshot_20231229-225929.jpg

According to this perfect balance I don't expect that my SoH will improve.
We'll see in a day or two...
@Dee. Look at your cell min/max difference at a low charge state. Probably much larger than at a full charge. My min/max was 59mv at 6% charge. Prior to rebalancing it was around 8mv at a charge of 80% or better (looked pretty good when checking at a higher SoC). After rebalancing the diff was only 10mv+/- below 15%, and 3% above 80% SoC. Biggest change was to the balance at a low SoC and this only happened after charging to 100% and letting the car sit unplugged. If you don't see any improvement after sitting at a low SoC don't despair. Finish the procedure and you will probably pick up 1.5 to 2 percentage points on your SoH. You might see if you can get the 3rd digit to display on your SoC graph. Based on the graph your cells are not exactly equal as the numeric readings would imply. Could be out of balance by as much as 9mv and min and max could be rounded to 4.17. Waiting with bated breath to see what improvement you get.
 
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I spoke to a technical friend of mine and he knows a thing or two about Porsche.

If your SoH may look lower than expected you can recalibrate the battery.

Porsche uses the following method [edited]
-Drive the battery below 2% SoC.
-Don't drive or charge the car for at least 6,5 hours.
-Recharge to at least 95% SoC.
-Don't drive or charge the car for at least 6,5 hours.

I'm about to recalibrate my battery so I'll post the results.
According to Carscanner my battery is at 89,9%@40.000 km (never did the 0 km test when it was new though).
I've started measuring SoH in 2022 at 15.000 km or so, which was already down to 90,3% SoH.

To be continued.

Screenshot_20220806-190832~2.jpg
I followed the protocol and gained 40 miles of range!
Previously the 2 times I charged to 100%, range was 255 miles.
Porsche Taycan How-to Recalibrate your SoH. IMG_2789

After the drain/wait/charge/wait process I now have 295 miles.
Yeehaw!
 
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Dee

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@Dee. Look at your cell min/max difference at a low charge state. Probably much larger than at a full charge. My min/max was 59mv at 6% charge. Prior to rebalancing it was around 8mv at a charge of 80% or better (looked pretty good when checking at a higher SoC). After rebalancing the diff was only 10mv+/- below 15%, and 3% above 80% SoC. Biggest change was to the balance at a low SoC and this only happened after charging to 100% and letting the car sit unplugged. If you don't see any improvement after sitting at a low SoC don't despair. Finish the procedure and you will probably pick up 1.5 to 2 percentage points on your SoH. You might see if you can get the 3rd digit to display on your SoC graph. Based on the graph your cells are not exactly equal as the numeric readings would imply. Could be out of balance by as much as 9mv and min and max could be rounded to 4.17. Waiting with bated breath to see what improvement you get.
Good call. 👍🏻
I've started charging already but after your post I did a quick scan (it was already at 2% SoC).
Porsche Taycan How-to Recalibrate your SoH. Screenshot_20240911-074734

It looks more scattered now but then again, the vertical scale is 3 to 4mV so it looks huge but the difference is only 1,47% (diff/highest value: 0,05mV/3,39mV×100%).
I stopped the charging now and check in an hour to see if the difference is less or that it's because I started the charging.
 
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After 1 hour of charging:
Porsche Taycan How-to Recalibrate your SoH. Screenshot_20240911-082800

The difference is now: 0,04/3,34×100%=1,16% so it balances out.
I'm charging at a slow rate, 2,3kW (230V/10A, single phase).

To be continued (in 36 hours 🤭)
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