99.4% SoH after 100,000 km on my 2021 J1.1 -- Can it be true?

[SergeyIndy]

I hadn't heard the 2025 is limited to 9.6.
Upgrading from '23 has been a mixed bag. : |

I now want to find a 60 amp level 2 and try it.

Please try and let us know. That seems to be a thing now starting with Macan EV for US only. On paper 11kw but in reality only 9.6kw. Now we are getting reports that all 2025+ Taycans limited to 9.6kw.

Please share more about a mixed bag, as many of us on J1.1 doing good as long as we do not have the usual Heater or Red Circle grounding us. Range is just what it in near freezing well below 200 miles on a daily highway going to work, but not a concern with home charging and more local fast charging available, at least where I am.

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[trycan]

Time is the unavoidable enemy of Lithium batteries. Even if you kept the car in bubble wrap, there would still be degradation after 5-years.

 

[Dee]

Said another way, that screen is showing the integral with respect to time of current x voltage, with the current and voltage sensors both residing within the EVSE. Interpret as you wish accordingly.

I'm not saying you're wrong but using just 82,4 kWh to charge from 1 to 100% is clearly not enough if you count the losses in.
Your 10-15% loses are within that 82,4 kWh so the only way to interpret that is that the SoC at the start was much higher than 1%.

Example: in my case, with the shown 97,0 kWh and with a confirmed SoC of 0%, the math is correct.
10-15% loss on 97,0 kWh makes about 83 kWh, that's a full battery.

 

[69Mach390]

I'm not saying you're wrong but using just 82,4 kWh to charge from 1 to 100% is clearly not enough if you count the losses in.
Your 10-15% loses are within that 82,4 kWh so the only way to interpret that is that the SoC at the start was much higher than 1%.

Example: in my case, with the shown 97,0 kWh and with a confirmed SoC of 0%, the math is correct.
10-15% loss on 97,0 kWh makes about 83 kWh, that's a full battery.

Multiple inaccurate measuring sticks unfortunately.

The displayed range (1%) really isn’t 1% like you said. Even when people show 0% you can still keep driving for a number of miles.

Plus battery chemistry and capacity changes with temperature.

In the end, even a scan is just an estimate.

 

[Dee]

The displayed range (1%) really isn’t 1% like you said. Even when people show 0% you can still keep driving for a number of miles.

It is about 8-10% but that's not the point.
The amount to go from 0% to 100% is the same, which is about 84 kWh although the battery is 93,4 kWh in total.

It's also not an estimate, these are hard numbers, independent from temperature.
The charging speed and range are highly dependent on the temperature, not capacity.

 

[trycan]

Even when people show 0% you can still keep driving for a number of miles.

The J1.2 doesn't have nearly the same bottom buffer that J1 offered. There was a YouTube video a while back and I don't remember exactly, but I think they could only go like another ~6-miles or something once the J1.2 battery was depleted showing 0%.

 

[M3Taycan]

Here are the Car Scanner readings I took yesterday of my Taycan (2023 Taycan 4S: 21,424 Miles). The car scanner has a dashboard that can be displayed on the PCM. Evgeny, this is the data the team is looking for once you have the OBDII device and the Car Scanner app. Enjoy!

 

[69Mach390]

It is about 8-10% but that's not the point.
The amount to go from 0% to 100% is the same, which is about 84 kWh although the battery is 93,4 kWh in total.

It's also not an estimate, these are hard numbers, independent from temperature.
The charging speed and range are highly dependent on the temperature, not capacity.

That is the point.

I’m not talking about the unusable buffer.

I’m talking about usable capacity vs displayed %.

Displayed 1% is not really 1% of usable capacity. And yes, it is dependent on temperature. How else do you explain how people can put their cars away at 1% and come back a few hours later to a displayed 5%?

Either way, the bottom line is this- the OP doesn’t have 99.4% SOH.

Capacity absolutely changes with temperature. Why do you think winter range sucks even if you don’t use the heater.

But maybe a chart will help:

 

[Dee]

The J1.2 doesn't have nearly the same bottom buffer that J1 offered. There was a YouTube video a while back and I don't remember exactly, but I think they could only go like another ~6-miles or something once the J1.2 battery was depleted showing 0%.

That's true and confirmed.
With the new battery chemistry and the good experience with the J1.1 battery behavior they lowered the bottom limit from 10 to 5% before it reads 0%.

 

[Dee]

Capacity absolutely changes with temperature. Why do you think winter range sucks even if you don’t use the heater.

But maybe a chart will help:

That's what I'm trying to say.
Capacity doesn't change with temperature but the amount of kWh you can get out of it.
Lithium ions in cold electrolyte don't like moving, that's why the active capacity changes, which means less range.
The chart actually says it: active specific capacity.

Either way, the bottom line is this- the OP doesn’t have 99.4% SOH.

Agree but I already explained that.

 

[Dee]

Here are the Car Scanner readings I took yesterday of my Taycan (21,424 Miles). The car scanner has a dashboard that can be displayed on the PCM.

Wow, I didn't know that!
That's actually very handy.
Thank you!

 

[tim a]

Just checked mine with car scanner. Later 2020 4s with 45000 on. SOH reading 87.88% I think that’s pretty good considering age and mileage

 

[69Mach390]

That's what I'm trying to say.
Capacity doesn't change with temperature but the amount of kWh you can get out of it.
Lithium ions in cold electrolyte don't like moving, that's why the active capacity changes, which means less range.
The chart actually says it: active specific capacity.


Agree but I already explained that.

Well yes.

Either way, to the point of this discussion, it’s a moving number based on temperature which is just another reason (on our already long list) that this isn’t a way to measure state of health. https://media.electrifyamerica.com/fivetips-charging-electric-vehicles-cold-weather

I remember a few years ago on another EV forum that the OP calculated 1.2 miles/kwh at 70 mph on the highway and figured his car was broken.

It took until page 8 of discussion to figure out he was dividing the miles driven by the change in displayed % state of charge to calculate efficiency.

You can’t draw conclusions when you use the wrong/inaccurate measuring stick.

 

[VOINOT4sP9J1]

hello
contribution for my car so
23/11/20

My OBD Car Scanner diagnostic shows 92%.
The official accuracy is +/- 5%.
See you soon.

 

[Longy_UK]

I had my car in recently for recall work and asked them to check the SoH. 56k miles and I’m at 85%.

That seems low? Do you regularly DC charge? At that rate you’ll be getting a shiny new battery under warranty at about 70k?

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