Significant drop in SoH

[GreaseMonkey]

I wouldn’t worry with what obd tools spit out. Unless you run a battery health check with FDRS which takes a few minutes and generates a report like this. Then you can see cell voltage issues etc.
As you can see in image here I’m at 97% at about 10.5k miles

Rob, this is interesting data. I’m curious if your battery’s SoH shows differently in the OBD. Do you mind telling us what that figure is? As mentioned above, the BMS programming changed recently, which is what made my battery’s SoH drop from 95 to 85%

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[Robob]

Many of the OBD scanners I have tried at my shop have been pulling the 12v SoH not the HVB. At the moment I only have the FDRS laptop. They have a specific BECM program that runs and polls all the cells and spits out this datasheet I attached.
Either way if the OBD is reading a HVB SoH value I am not sure it is updated as regularly and thoroughly as the actual BECM battery health program in FDRS is generating when it runs its tests.

 

[kennethjk]

23k miles and 2 years of owners and sporadic fast charging and SoH was 97.5 as of today and I haven’t noticed any drop in range.

 

[SpaceEVDriver]

I took a road trip from northern AZ to Las Cruces, NM. On the way, I did two L2 charges from relatively low to 100%.

I started the drive at 100% (but it was below 0ºC, so its capacity was quite a bit lower than nominal). I didn't stop to charge until I reached an RV park where I L2 charged from 13% to 100% without interruption.

The second L2 charge was on a 6kW ChargePoint charger at a hotel. It was quite a bit warmer over night. The car charged from 32% to 100% without interruption.

Before the first charge, my car claimed 87% SoH. After the first charge, the car claimed 88% SoH. After the second charge, my car claimed 90% SoH, and midway through my trip home, it claimed 91% SoH. I am home now, but I haven't checked its reported SoH.

I'll do a full charge cycle from 100% to ~0% to 100% once it warms up in a week or three.

 

[Billyk24]

If you're DCFC I'm guessing you don't hit 100% very often, which is when I've seen the load balancing occur. If I recall correctly, we should be charging to 100% every month or couple of months. I don't know if it's explicitly called out in our manuals but Kia does in theirs so I assume the same logic applies

Never read or heard of such. I haven't been to 100% since end of August and my soh is like 99.6!

 

[Shayne]

Never read or heard of such. I haven't been to 100% since end of August and my soh is like 99.6!

Ducked Kia manuals and then EV6 and opened the PDF. CTRL F 100 in the PDF came up with this

What's the logic if any? But now we have heard of it

 

[Snakebitten]

I did a bunch, about a dozen, updates yesterday. Wide array of modules.

I already didn't have much faith in the Car Scanner app's SOH value, because there's no documentation to define its algorithm.
But after seeing it drop from 99% yesterday to 92.2% the moment I finished the updates last night, has me very sceptical that it's something to go by.

I'm not saying it has no value as a monitor, but I am saying it's obviously not something that is simply reporting a SOH value calculated by Ford.

 

[Mach-Lee]

I did a bunch, about a dozen, updates yesterday. Wide array of modules.

I already didn't have much faith in the Car Scanner app's SOH value, because there's no documentation to define its algorithm.
But after seeing it drop from 99% yesterday to 92.2% the moment I finished the updates last night, has me very sceptical that it's something to go by.

I'm not saying it has no value as a monitor, but I am saying it's obviously not something that is simply reporting a SOH value calculated by Ford.

Doing the update forces the SOH value to update (it was stuck at 99% previously). Hence the big drop to reality. It updates the value much more often now. Doing a 10%-100%-10%-100% cycle should get you a fairly accurate read on the battery's current SOH.

 

[Snakebitten]

Doing the update forces the SOH value to update (it was stuck at 99% previously). Hence the big drop to reality. It updates the value much more often now. Doing a 10%-100%-10%-100% cycle should get you a fairly accurate read on the battery's current SOH.

Being familiar with the Nissan Leaf dedicated monitoring app (LeafSpy), I might have mistakenly discounted the car scanner app for the Mach-E SOH value.
I say that because it seemed like the software development required to glean a true and accurate SOH from a vehicle, in this case the Nissan Leaf, required considerable understanding of trade secrets of the manufacturer.

So how does the developer of car scanner, which certainly isn't a dedicated Mach-E software app, so easily come up with the necessary information for calculating Ford's SOH?
I just assumed that they were using a sort of one-size-fits-many algorithm for an EV battery. Not that it wouldn't be ballpark, but not exact science either.

And why was it stuck on my Mach-E?
Has it been stuck on all Mach-E's until recent updates?

Apologies for not having but a couple of months of sponging the forum. I'm sure SOH has been discussed more than I have seen.

 

[Mach-Lee]

Being familiar with the Nissan Leaf dedicated monitoring app (LeafSpy), I might have mistakenly discounted the car scanner app for the Mach-E SOH value.
I say that because it seemed like the software development required to glean a true and accurate SOH from a vehicle, in this case the Nissan Leaf, required considerable understanding of trade secrets of the manufacturer.

So how does the developer of car scanner, which certainly isn't a dedicated Mach-E software app, so easily come up with the necessary information for calculating Ford's SOH?
I just assumed that they were using a sort of one-size-fits-many algorithm for an EV battery. Not that it wouldn't be ballpark, but not exact science either.

And why was it stuck on my Mach-E?
Has it been stuck on all Mach-E's until recent updates?

Apologies for not having but a couple of months of sponging the forum. I'm sure SOH has been discussed more than I have seen.

They can sniff the CAN commands from FDRS and use them in their app. Or borrow from a Chinese or Russian library of manufacturer specific PIDs that 3rd party scan tool companies use. SoH has probably been in the Ford EV PID list since the Focus Electric, possibly in the hybrids before that too.

The SoH value reported is correct from what I can tell and correlates with range displayed, kWh to empty, etc. So if it says 91% SoH, that's what the BECM thinks it is. It's not wrong. Like I said, the BECM is updating the value much more often now. If you didn't charge to 100% very often or do deep charges, then the value could be off.

 

[SpaceEVDriver]

I took a road trip from northern AZ to Las Cruces, NM. On the way, I did two L2 charges from relatively low to 100%.

I started the drive at 100% (but it was below 0ºC, so its capacity was quite a bit lower than nominal). I didn't stop to charge until I reached an RV park where I L2 charged from 13% to 100% without interruption.

The second L2 charge was on a 6kW ChargePoint charger at a hotel. It was quite a bit warmer over night. The car charged from 32% to 100% without interruption.

Before the first charge, my car claimed 87% SoH. After the first charge, the car claimed 88% SoH. After the second charge, my car claimed 90% SoH, and midway through my trip home, it claimed 91% SoH. I am home now, but I haven't checked its reported SoH.

I'll do a full charge cycle from 100% to ~0% to 100% once it warms up in a week or three.

After a 1500 mile road trip with several low SoC stops at DCFCs (6 miles remaining at one stop), and a couple of L2 charges to 100%, the car claims 92% SoH. I believe this is closer to reality.

Today, I ran the car to 0% State of Charge on the Display (about 5% real) and am now charging to 100% overnight. Will report back on the SoH claim tomorrow.

 

[Mach-Lee]

After a 1500 mile road trip with several low SoC stops at DCFCs (6 miles remaining at one stop), and a couple of L2 charges to 100%, the car claims 92% SoH. I believe this is closer to reality.

Today, I ran the car to 0% State of Charge on the Display (about 5% real) and am now charging to 100% overnight. Will report back on the SoH claim tomorrow.

In my experience it will probably go up about a percent or two from the 0-100%, but after you resume normal daily charging behavior it will go back down in a few days.

 

[SpaceEVDriver]

In my experience it will probably go up about a percent or two from the 0-100%, but after you resume normal daily charging behavior it will go back down in a few days.

That matches my expectation.

I haven't deliberately dropped to very low SoC and charged all the way up to 100% in more than a year. And while it's a pretty low-necessity thing with the BECMs these cars have, I'm kind of pedantic about doing this every so often. We happened to arrive home from our trip with a low enough SoC that it is easy enough to make this happen tonight.

After 26 months, 37,500 miles and many more than a hundred DCFCs, I'm happy with 92% SoH. Even if the degradation is linear, I have no worries about getting more than 100,000 to 150,000 miles before the battery hits 70% SoH.

 

[GreaseMonkey]

That matches my expectation.

I haven't deliberately dropped to very low SoC and charged all the way up to 100% in more than a year. And while it's a pretty low-necessity thing with the BECMs these cars have, I'm kind of pedantic about doing this every so often. We happened to arrive home from our trip with a low enough SoC that it is easy enough to make this happen tonight.

After 26 months, 37,500 miles and many more than a hundred DCFCs, I'm happy with 92% SoH. Even if the degradation is linear, I have no worries about getting more than 100,000 to 150,000 miles before the battery hits 70% SoH.

I don’t know. I want the Mach-E’s battery to be as good as a Tesla’s — 88% at 200,000 miles. That figure makes an EV practically longer lasting than an ice.

 

[OcSteve39]

I have never been to 100%
So when are my wheels falling off?

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