🔋 Baseline for HV Battery SoH Performance (Battery Degradation Data by Taycan Owners)

[DougFrisk]

Suspect (and as you well know), if you charge to 100% now (take a reading) and then run down min. half and maybe a charge back to ca 80% with another SoH reading, you'll see another bump back up!

Yup, which is why I mentioned it was taken at 3%. The cell voltage graph looked fairly ragged which I'd expect after starting at 100%, driving down to 50% fast charging to 80% driving down to 10% then fast charging to 45% then driving it down to 5%. Nothing looked alarming, but the range from high to low was more that I usually see. I'm thinking after a nice charge and restful rebalance SoH will be back above 99%.

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[Tornadosailor]

appreciate all this work done here, please find some datapoints for my GTS ST built Dec 2022

from actual backwards

Dec 2023
1) unknown
2) 93,07%
3) 33.500 km
4) in total about 15% DC charging
5) Build date Dec 2022

mid Dec 2023
2) 90,93%
3) 32.100 km

early Nov 2023
2)89,67%
3) 27.000 km

end July 2023
2) 93,46%
3) 20.800km

9th Jan 2023
2)95,80%
3) 2.500km

using my car mainly on German Autobahn with a usual target speed of 160/170 kmh but sometimes when in a hurry had to do 250kmh plus. I am driving 266km door to door in a regular basis and always make it without charging on the way. In winter max speed should not exceed 170, in summer you can go (case need) max 200/210 to make it. If you try to go max speed you need to charge on the way for sure.

 

[ciaranob]

appreciate all this work done here, please find some datapoints for my GTS ST built Dec 2022

from actual backwards

Dec 2023
1) unknown
2) 93,07%
3) 33.500 km
4) in total about 15% DC charging
5) Build date Dec 2022

mid Dec 2023
2) 90,93%
3) 32.100 km

early Nov 2023
2)89,67%
3) 27.000 km

end July 2023
2) 93,46%
3) 20.800km

9th Jan 2023
2)95,80%
3) 2.500km

using my car mainly on German Autobahn with a usual target speed of 160/170 kmh but sometimes when in a hurry had to do 250kmh plus. I am driving 266km door to door in a regular basis and always make it without charging on the way. In winter max speed should not exceed 170, in summer you can go (case need) max 200/210 to make it. If you try to go max speed you need to charge on the way for sure.

Excellent data - I will add to the chart asap - thx for sharing!

 

[ciaranob]

appreciate all this work done here, please find some datapoints for my GTS ST built Dec 2022

from actual backwards

Dec 2023
1) unknown
2) 93,07%
3) 33.500 km
4) in total about 15% DC charging
5) Build date Dec 2022

mid Dec 2023
2) 90,93%
3) 32.100 km

early Nov 2023
2)89,67%
3) 27.000 km

end July 2023
2) 93,46%
3) 20.800km

9th Jan 2023
2)95,80%
3) 2.500km

using my car mainly on German Autobahn with a usual target speed of 160/170 kmh but sometimes when in a hurry had to do 250kmh plus. I am driving 266km door to door in a regular basis and always make it without charging on the way. In winter max speed should not exceed 170, in summer you can go (case need) max 200/210 to make it. If you try to go max speed you need to charge on the way for sure.

OK, just so just to check that I am reading this correctly - your Soh has gone as follows (in mileage order):

95.8 to 93.5 to 89.7 to 90.9 to 93.1 - is this right?
(rounding to one dec place).

 

[Tornadosailor]

Yep, prior both increasements charged from around 10% to 80& and timercharged to 100% and went for a longer drive. Especially 2nd increase was a bit surprising to me.

 

[ciaranob]

Yep, prior both increasements charged from around 10% to 80& and timercharged to 100% and went for a longer drive. Especially 2nd increase was a bit surprising to me.

When I first plotted this it looked ominously similar to Scandinavian's failed battery path but since then there have been a number of cars that have performed the 'cell re-balancing' or 'cycling' just as you have described including my own car and gained 1-2% pts - mine jumped 2.5% well in line with what you are seeing so hopefully all good

PS: working chart now and it will be up soon

 

[ciaranob]

Yep, prior both increasements charged from around 10% to 80& and timercharged to 100% and went for a longer drive. Especially 2nd increase was a bit surprising to me.

Charts updated (in Post #1) - zoomed in view here of expanded plot to highlight your data (albeit a different metric here):

 

[Dee]

This is a very interesting vid:

 

[rs38]

Since I pulled all the data yesterday I might as well update the info.

SoH 98.81 (down over 1%) at 2000 miles taken at a state of charge of 3%

from what I learned after reading so many SoH: you will have readings at 97-98% after a few days no matter what you drive or charge, but would not worry at all.

 

[DS29]

Charts updated (in Post #1) - zoomed in view here of expanded plot to highlight your data (albeit a different metric here):

Hi
ciaranob

as a new member i just wanted to say thanks for all this great analysis it has really helped my understanding and it really speak to my inner quant!
I am in the process of trying to buy an approved used Taycan Turbo. I was hoping to plot a point onto your charts to see how it stacks up as the one i am looking at is a relatively high mileage ~30k.
I have asked the Porsche dealership to provide a SOH read out but they are saying they cannot provide / do not have this information. Any tips on what to ask for? surely they have access to something comparable or a gauge on battery health in the Porsche maintenance systems?
Any tips greatly appreciated. It seems like a basic question to me and I am slightly perturbed by their inability to answer it!

NB when I buy i will be sure to return here with my stats to add to your sample set

Thanks a bunch

 

[Gru]

the 1st thing I would do if I plan to buy a used one (from dealer or someone) : buy a OBDII dongle, plug it and use Car Scanner to check the SoH.

Dongles are cheap, and will be useful anyhow

 

[ciaranob]

Hi
ciaranob

as a new member i just wanted to say thanks for all this great analysis it has really helped my understanding and it really speak to my inner quant!
I am in the process of trying to buy an approved used Taycan Turbo. I was hoping to plot a point onto your charts to see how it stacks up as the one i am looking at is a relatively high mileage ~30k.
I have asked the Porsche dealership to provide a SOH read out but they are saying they cannot provide / do not have this information. Any tips on what to ask for? surely they have access to something comparable or a gauge on battery health in the Porsche maintenance systems?
Any tips greatly appreciated. It seems like a basic question to me and I am slightly perturbed by their inability to answer it!

NB when I buy i will be sure to return here with my stats to add to your sample set

Thanks a bunch

Echoing @Gru above - def buy a dongle (any of those recommended here being BLE 4 compatible) and the CarScanner app is free - dongle somewhere between 30-50E.

The majority of dealerships are fairly oblivious to the fact that the flash reading we take by our OBDII dongles can be done in minutes - their techs will use the exact same procedure to read the exact same data via PIWIS but unless your SA talked directly to a tech he may just be reciting SOP at the dealership. Time is money but a scan by dongle is literally minutes - oh well!

A proper battery cycle test by factory techs is more involved and def would be a cost item so that will not be offered. You can 'sort of' do a proxy of that as again described in the thread but we can get into that later if interested (you may already be aware).

You could I guess suggest to the SA/Salesperson that a tech just run a PIWIS flash test or ask if you can run your own OBDII but I seriously doubt they'd let that happen.

Best Of luck in your purchase and hopefully we'll see your data added soon

 

[ciaranob]

This is a very interesting vid:

Thanks for reminding me - ever since Scandinavian shared this I have been meaning to put a link in Post #1 - will do later - excellent vid.

 

[WasserGKuehlt]

My almost-1-year update:
2) 92.33%
3) 17,200 mi

It seems to have leveled over the past 2k miles.

 

[DS29]

Echoing @Gru above - def buy a dongle (any of those recommended here being BLE 4 compatible) and the CarScanner app is free - dongle somewhere between 30-50E.

The majority of dealerships are fairly oblivious to the fact that the flash reading we take by our OBDII dongles can be done in minutes - their techs will use the exact same procedure to read the exact same data via PIWIS but unless your SA talked directly to a tech he may just be reciting SOP at the dealership. Time is money but a scan by dongle is literally minutes - oh well!

A proper battery cycle test by factory techs is more involved and def would be a cost item so that will not be offered. You can 'sort of' do a proxy of that as again described in the thread but we can get into that later if interested (you may already be aware).

You could I guess suggest to the SA/Salesperson that a tech just run a PIWIS flash test or ask if you can run your own OBDII but I seriously doubt they'd let that happen.

Best Of luck in your purchase and hopefully we'll see your data added soon

Thanks both for guidance.
With some more prompting the dealership were able to find the SOH test function in the PIWIS system and are going to run for me. I have also ordered my own vLinker dongle (the model recommended on another post) as I'm sure it will come in handy either way

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