[Poll + Tracking] HV battery state of health tracking (SOH) w/ self updating analytics -- crowdsourced data (add yours)

[lwilliams0514]

Hi everyone, I used google forms to help all of us >>track our high voltage battery state of health<<

• you can input data as many times as you want, that way you can even track yourself over time with this (just be sure to type your user name, which is otherwise optional)
  • this is for state of health, not state of charge -- you need an OBD reader to pull SOH, i bought this one from temu for $3 and it works fine, there's a million other choices
• all data is publicly viewable and self-updating with new survey inputs
• if folks think questions in the survey need to be changed, want to see different analytics, or want to get involved in this tracking feel free to reach out to me via DM
• extra shoutout to @AngryMan who started tracking this manually in this thread. he collated all of the inputs from the thread as of Aug 13, 2024 and i already input that into this tracker

Analytics and outputs are viewable right here, you can feel free to download and/or further analyze the data at any time because it self-updates based on the survey

Looks like I made the chart expand a lil bit lol

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[flapjake314]

Looks like I made the chart expand a lil bit lol

looking at your datapoint more closely, you are way ahead of the trend on mileage vs SOH but right on trend for age vs SOH

i continue to conclude the battery deterioration is almost entirely age rather than mileage

i myself have a very low mileage vehicle (20k) but ~3 years, and is at a lower SOH than yours

 

[satpet]

Hello,
I added my SOH. It's 88,5%.
Miles is 14641 ( 23562 km)
I only charged once to 100%. Mostly I stay between 80/70% and 20%

I had a doubt on the real battery capacity since the beginning, because I 'm charging less kW from the charger than procentual is added in to the car. (example charging from 20 to 70% would expect to add 45,5 kW in the battery + charging loss) I got always much less, e.g.: 42kW, while I would expect around 50kW, charging loss included.

The car is new from Feb/24, but I found construction is Oct/23.

I will try to find time to do the calibration as explained in https://www.macheforum.com/site/threads/hv-battery-calibration-procedure.23815/
Problem is I drive a lot and next weekend I have trip of 1850km in one weekend, where I could use a better GOM.
Hope I can find time to do that before the long trip.

 

[SpaceEVDriver]

Couple of comments:
You're missing CA-RT1 as an option for the vehicle trim. I couldn't fill out the survey. Also, as a rule, I don't put my email address into Google forms.
CarScanner can read the exact battery age in months (to two decimal places).
I DCFC much, much more than 24 times a year.

2022 CA-RT1, AWD, ER
32.88 months (Feb 2022)
94% SoH
Number of *recorded* DCFCs from my records is > 120. Number of actual DCFCs is probably closer to 200.

 

[flapjake314]

Couple of comments:
You're missing CA-RT1 as an option for the vehicle trim. I couldn't fill out the survey. Also, as a rule, I don't put my email address into Google forms.
CarScanner can read the exact battery age in months (to two decimal places).
I DCFC much, much more than 24 times a year.

2022 CA-RT1, AWD, ER
32.88 months (Feb 2022)
94% SoH
Number of *recorded* DCFCs from my records is > 120. Number of actual DCFCs is probably closer to 200.

thanks for the comments
- i have added CA RT1
- email address is not requested, not required, and not recorded (as mentioned in the OP even username is not required, you are welcome to submit complete anonymously, typing your username just helps you track yourself over time if you'd like). if you are logged into google it might be showing your email address but it specifically says it is not recorded, you can also feel free to log out first or use incognito, this is just how google survey is built
- i know the carscanner battery age field, the conversation that was had in developing the question was the user may get mixed up between battery date, purchase date, sticker date, repurchase date, etc. i think we all know the manufacture sticker date best so was decided that's the easiest way to get the data, it'll be mostly correct in any case
- DCFC was a very hard field to try and capture (no one is tracking it each time they charge, there's no easy to way go backwards and count the history, there are lots of one-offs if you did a road trip or something, etc) that said the vague question/answer seems to indicate show not much of an impact anyway. welcome thoughts on how to improve this if you'd like though

finally if you'd like me to enter your data i can or you can go do yourself just let me know

 

[flapjake314]

Hello,
I added my SOH. It's 88,5%.
Miles is 14641 ( 23562 km)
I only charged once to 100%. Mostly I stay between 80/70% and 20%

I had a doubt on the real battery capacity since the beginning, because I 'm charging less kW from the charger than procentual is added in to the car. (example charging from 20 to 70% would expect to add 45,5 kW in the battery + charging loss) I got always much less, e.g.: 42kW, while I would expect around 50kW, charging loss included.

The car is new from Feb/24, but I found construction is Oct/23.

I will try to find time to do the calibration as explained in https://www.macheforum.com/site/threads/hv-battery-calibration-procedure.23815/
Problem is I drive a lot and next weekend I have trip of 1850km in one weekend, where I could use a better GOM.
Hope I can find time to do that before the long trip.

another user @Kabish also showed a much lower than average SOH, though yours seems to be even worse given the low mileage and short lifetime. indeed would suggest seeing if the calibration helps but also just keeping an eye on it over time...

i will note everyone agrees the degradation is steepest at the start. you may have accelerated/exacerbated results because of the mileage in a short period, how it evolves over time would prove whether that's the case

regarding the charging stats i'm not sure that's a useful datapoint. i had previously been told it would still take the same amount of input energy to charge but it would just be less efficient, i.e. a 80% battery that was original 100KWH would still take 100KW to charge (more in fact bc of heat loss) but would only hold 80KW but folks smarter than me will tell me if that's wrong

 

[SpaceEVDriver]

thanks for the comments
- i have added CA RT1
- email address is not requested, not required, and not recorded (as mentioned in the OP even username is not required, you are welcome to submit complete anonymously, typing your username just helps you track yourself over time if you'd like). if you are logged into google it might be showing your email address but it specifically says it is not recorded, you can also feel free to log out first or use incognito, this is just how google survey is built
- i know the carscanner battery age field, the conversation that was had in developing the question was the user may get mixed up between battery date, purchase date, sticker date, repurchase date, etc. i think we all know the manufacture sticker date best so was decided that's the easiest way to get the data, it'll be mostly correct in any case
- DCFC was a very hard field to try and capture (no one is tracking it each time they charge, there's no easy to way go backwards and count the history, there are lots of one-offs if you did a road trip or something, etc) that said the vague question/answer seems to indicate show not much of an impact anyway. welcome thoughts on how to improve this if you'd like though

finally if you'd like me to enter your data i can or you can go do yourself just let me know

Apologies about the email address comment--they put the red asterisk next to required questions and that was sitting right *under* the email question... I haven't had my coffee yet...

Thanks for updating the trim--I filled in my data point from yesterday.

I have records of my SoH in my database. I may go back to fill them in later.

For now, 42,000-ish miles, about 200 DCFCs, and ~33 months, and a SoH of 94% is right where I expect this to fall from reading lithium battery lifetime literature over the past decade.

 

[flapjake314]

I have records of my SoH in my database. I may go back to fill them in later.

if you dump me the excel i'm happy to paste directly into the sheets, rather than force you to go through the survey over and over...

 

[SpaceEVDriver]

if you dump me the excel i'm happy to paste directly into the sheets, rather than force you to go through the survey over and over...

I may do that. It's not clean at the moment, though, so will need to find time to clean it up.

 

[Teslaeata]

Just tested SoH at 98,500 miles at full charge and getting 94%.

Just took the decision to keep Stangy after much consideration, SoH checks, transmission oil analysis and poring over all that, the fuel stats & maintenance costs.

Detail to follow in case anybody’s interested on a high miler’s vital statistics.

 

[mkhuffman]

I love this thread. Thanks for managing it, Jake!

If anyone is interested, I have been tracking the SoH of my MME GT that was built in August of 2021 and delivered to me in November of 2021.
https://www.macheforum.com/site/thr...e-of-health-how-much-decline-is-normal.26902/

It appears the battery in my MME is in worse shape than many others contributing here. That is disturbing. The only thing I can think that may be unusual is my propensity to floor it every time I drive the car.

Could a large number of WOTs make a difference? Sort of makes sense that it would, as the current draw at WOT is the highest it will ever see, much higher than a DCFC.

Am I going to stop the WOTs? No way. That is the biggest reason I decided on a GT over a Premium. If I can't use it, why did I buy it?

 

[Teslaeata]

I love this thread. Thanks for managing it, Jake!

If anyone is interested, I have been tracking the SoH of my MME GT that was built in August of 2021 and delivered to me in November of 2021.
https://www.macheforum.com/site/thr...e-of-health-how-much-decline-is-normal.26902/

It appears the battery in my MME is in worse shape than many others contributing here. That is disturbing. The only thing I can think that may be unusual is my propensity to floor it every time I drive the car.

Could a large number of WOTs make a difference? Sort of makes sense that it would, as the current draw at WOT is the highest it will ever see, much higher than a DCFC.

Am I going to stop the WOTs? No way. That is the biggest reason I decided on a GT over a Premium. If I can't use it, why did I buy it?

Absolutely right?

I doubt driving it like it’s a rental would cause your apparently SoH loss.

Might be the conditions under which you take the test giving a false reading, or something else, heat, the cold, charging habit, there are loads of imponderables.

Can’t you run a better condition test to see what every cell and array is doing?

But even if not a rental drive it mental?

Life’s for the living, Stang’s for the enjoying?

 

[flapjake314]

I love this thread. Thanks for managing it, Jake!

If anyone is interested, I have been tracking the SoH of my MME GT that was built in August of 2021 and delivered to me in November of 2021.
https://www.macheforum.com/site/thr...e-of-health-how-much-decline-is-normal.26902/

It appears the battery in my MME is in worse shape than many others contributing here. That is disturbing. The only thing I can think that may be unusual is my propensity to floor it every time I drive the car.

Could a large number of WOTs make a difference? Sort of makes sense that it would, as the current draw at WOT is the highest it will ever see, much higher than a DCFC.

Am I going to stop the WOTs? No way. That is the biggest reason I decided on a GT over a Premium. If I can't use it, why did I buy it?

There have been several members recently that have been reporting even worse degradation than yours (check the graph and you'll see them or scroll up), I spoke with them and didn't hear anything out of the ordinary (minimal dcfc, not charging to 100% often, not driving strange, etc)

Might just be luck of the draw. Not the same manufacture date either

 

[flapjake314]

just as an update, i did recalculate (and create a new graph on fig4) using battery cycles rather than just mileage

some of us have bigger batteries, and what wears out the battery is not the mile but the cycle. i used EPA estimated mi/kwh, by model, compared to the battery size, as input by each user

the r2 value seems to be stronger than just the pure mileage. i keep the mileage graph though because i think most people will view that as most intuitive, and it is easiest to compare against your own personal situation which makes the trend line more useful

 

[mkhuffman]

just as an update, i did recalculate (and create a new graph on fig4) using battery cycles rather than just mileage

some of us have bigger batteries, and what wears out the battery is not the mile but the cycle. i used EPA estimated mi/kwh, by model, compared to the battery size, as input by each user

the r2 value seems to be stronger than just the pure mileage. i keep the mileage graph though because i think most people will view that as most intuitive, and it is easiest to compare against your own personal situation which makes the trend line more useful

Sniff. My sad little battery, lonesome at the bottom of the pack.

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