How do I check high voltage battery degradation?

[robi]

I should know this by now but somehow don’t. Is it possible for the average EV owner or potential buyer to regularly check and track their high voltage EV battery degradation? I‘d like to be able to do this on my 2025 Mach E purchased new last October. I’d also be curious if this can be done when looking at a potential used EV or an unsold EV that’s has not found a new owner in almost a year like a 2025 Lightning sitting on my dealership’s lot. In the case of the Mach E or the Lightning is this as simple as the way I check the maximum capacity of my iPhone battery or is it a complicated test available only to a Ford tech by running a test procedure. As a person that loves electric vehicles with family and friends looking to me for advice on car purchases, I’d like to be able to know how to do this on my Mach E and other electric cars they might ask me about. I also understand it is impacted by how the battery has been treated in terms of charging rate and temperature extremes. People that take care of their batteries I would think should be able to use that data to get a better resale value just as ICE drivers often use the frequency of oil changes as an indicator of good care.

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[RickMachE]

CarScanner app and OBD adapter. Many threads discuss this.

 

[Teslaeata]

It’s dead easy for a layman. You’ll smash it

 

[Jacnoc]

Is HV SOH actually available for 2025 models? I have carscanner and a Bluetooth OBD plug and many of the properties are encrypted as of the 2025 model year. If there's updated hardware that allows access to those settings, I'd love to learn about it.

 

[robi]

Thanks for the OBD adapter link and CarScanner APP tip . I figured it must involve purchasing something in conjunction with a program but was hoped there might be some built in screen that might allow tracking this. I’ll also go through the past forum posts to better educate myself.

 

[astrorob]

Is HV SOH actually available for 2025 models? I have carscanner and a Bluetooth OBD plug and many of the properties are encrypted as of the 2025 model year. If there's updated hardware that allows access to those settings, I'd love to learn about it.

you know, i thought the same thing, but then the guy developing Pankuzu said that the properties are only obfuscated and not encrypted. i don't have more info than that... so not sure what other software can see, or if Pankuzu even attempts to read the SOH. maybe that one is still unavailable.

https://www.macheforum.com/site/thr...ording-app-for-your-mach-e.53095/post-1083980

 

[Jacnoc]

Interesting! I'm an Android user so Pankuzu is not of immediate use to me, but if they could figure out the obfuscation method, maybe the Carscanner developer can too.

 

[NY_Cade69]

You can easily do it at a charge.

You need the total kW delivered by the charger (TC)
The Starting Battery Percentage (SP)
The Ending Battery Percentage (EP)
and the Nominal Battery Capacity (OB) - for the Mach-E it is 98.8 ext. Range or 75.7 std Range
Measured Capacity (MC) = 100 * TC / (EP-SP)
State of Health (SOH) = 10000 * TC /((EP-SP) * OB)

 

[Billyk24]

You can easily do it at a charge.

You need the total kW delivered by the charger (TC)
The Starting Battery Percentage (SP)
The Ending Battery Percentage (EP)
and the Nominal Battery Capacity (OB) - for the Mach-E it is 98.8 ext. Range or 75.7 std Range
Measured Capacity (MC) = 100 * TC / (EP-SP)
State of Health (SOH) = 10000 * TC /((EP-SP) * OB)

There is a conversion loss between AC (wall outlet kWh) and DC ( Battery kWh). Somewhere around 9 or 10%

 

[NY_Cade69]

The above is probably best done at a DC-DC charge, But just like the GOM, there are too many untracked variables, so even swings +/- 5 shouldn't be alarming, unless steadily going down. You are looking for trends and ballpark numbers rather than absolutes.

 

[sergiomo]

Is HV SOH actually available for 2025 models? I have carscanner and a Bluetooth OBD plug and many of the properties are encrypted as of the 2025 model year. If there's updated hardware that allows access to those settings, I'd love to learn about it.

Yes. This is FORScan Lite. Not sure about other software.

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