SOH

[fshuk1]

Just had the first service.

Bought 01nov22= 1 year 4 month (ish)
8500 miles
SOH= 95%

 

[siteguru]

As I recall, the service intervals (for warranty) are 12 months / 15k miles ... have they confirmed your warranty is still valid?

My SOH was the same.

 

[okohll]

Hmm, they didn't report the state of health at my first service, did you specifically ask? Though I do have an ODB dongle, so could read it myself

 

[fshuk1]

I did not ask . It is on their work sheet. I tried to book a service last year and they gave me the next appointment they had in MARCH. They are selling a lot of MGs.

 

[siteguru]

It's part of the service ... forms part of the Electric Vehicle Health Check that is to be done at every service. (At least as far as my dealer is concerned, although I couldn't see it specifically mentioned in the Service Portfolio).

 

[Rusty]

Our March 23 reg MG4 SE LR went in for its first service. 11,000 miles has only had 3 rapid charges and charging between 35% to 80% with a roughly monthly battery balance to 100%.
11,000 miles and 100% SOH Very pleased with that. Only had a software update for schedule charging ( car would start to charge as soon as it was plugged in) I would check the app and car including the wall charger before plugging in. Still on R16 version.

 

[siteguru]

The LR battery has a much bigger buffer than the SR one. That's why the reported SOH tends to stay higher for longer. (i.e. the usable capacity of the battery is artificially restricted from new to give the appearance that it is retaining its capacity for longer).

 

[Boilerboy]

Bought 16 Dec 22= 1 year 3 months
9500 miles
SOH= 99% (i have only fast charged (DC) the car once)

Car is Trophy model with 64kWh battery

 

[Tig170]

From this post : MG4 LFP/NMC batteries
which I wrote: Indeed : I do 1000 miles a month, so in 13 months, I've worked out that I've done 75 full cycles (13000 miles / 175 average range - 150 winter, 200 summer) (Standard LFP battery). At 6 months (6500miles), I had 2.8% degredation, and 6-7 months later (13000miles), I've now got a 3.6% degredation so it is curving in the right direction - for LFP they say around 10-20% degredation at 10 years - but who really knows?

Today its reading 19500 miles & 95.6% or 4.4% degredation,

but if you plot these 3 points its so linear (with time or distance - with distance R^2 = 1 - Mmm ), I suspect that all these tools are doing is trying to do some sort of regression from an unknown starting point, also as noted by @siteguru, the NMC & LFP battery have differenct initial buffers.

The realway to get an accurate figure is to fully discharge and then measure its full recharge capacity, which takes a full 24hrs on a tesla in service mode

 

[PeteC]

Our March 23 reg MG4 SE LR went in for its first service. 11,000 miles has only had 3 rapid charges and charging between 35% to 80% with a roughly monthly battery balance to 100%.
11,000 miles and 100% SOH Very pleased with that. Only had a software update for schedule charging ( car would start to charge as soon as it was plugged in) I would check the app and car including the wall charger before plugging in. Still on R16 version.

Did the update sort out the scheduled charging? Mine always starts up as soon as it is plugged in. I then stop it using the app and it then waits for the scheduled time before starting again (as long as I don't open the app again, which can trigger it starting to charge!). It drives me scatty...

 

[Macadoodle]

I suspect that all these tools are doing is trying to do some sort of regression from an unknown starting point.

Yep, I think these dealer SOH reports are a bunch of bollox personally

 

[Rusty]

Did the update sort out the scheduled charging? Mine always starts up as soon as it is plugged in. I then stop it using the app and it then waits for the scheduled time before starting again (as long as I don't open the app again, which can trigger it starting to charge!). It drives me scatty...

Will try this weekend and let you know.

 

[Lovemyev]

Our ZS EV LR ( NMC battery ) has covered almost 16,000 miles now.
It is always charged from our home wall box and has not received any D/C rapid charging.
Normal charging cycle is charge to 80% SOC and only been charged to 100% on two occasions.
You draw your own conclusions on the effects of balancing the battery from this fact.
It has just had its second annual service at the dealers and I made a point of asking for a print out of the SOH of the traction battery.
When the car was returned, the service sheet had been populated with a 99% SOH for the traction battery.
Also a screen shot print out, had been left in the car.
It was clearly taken when the MG computer was interrogating the batteries condition.
Of course, it supports the SOH hand written figure on the service check off sheet and it is definitely my vehicle, because the VIN number displayed in the top R/H corner of the screen shot, perfectly matches with our car.

 

[PeteC]

Will try this weekend and let you know.

Thanks.

 

[Rusty]

Thanks.

Hi PeteC
I have just finished trying different scheduled charging settings. Before the update it didn't seem to wait for the start time, it just started when I plugged it in. If I clicked finished charging on the app it wouldn't charge at the start time . The one that works now and I've tried it twice is......
Car in ready (Drive mode). Check charging schedule in car and cancel app schedule. Open flap, lock car then plug in cable (blue light is on and then went off). Checked app and the schedule was the same as car. Have plugged car in now and will check up to 00.30am (start time)
Hope this helps.

 

[Tig170]

Yep, I think these dealer SOH reports are a bunch of bollox personally

Well I've just put in my figures into spreadsheet: so at its current degredation rate to get to below 70% (which I believe is the warranty level) will be 280,000 miles - I think @Macadoodle is right

 

[PeteC]

Hi PeteC
I have just finished trying different scheduled charging settings. Before the update it didn't seem to wait for the start time, it just started when I plugged it in. If I clicked finished charging on the app it wouldn't charge at the start time . The one that works now and I've tried it twice is......
Car in ready (Drive mode). Check charging schedule in car and cancel app schedule. Open flap, lock car then plug in cable (blue light is on and then went off). Checked app and the schedule was the same as car. Have plugged car in now and will check up to 00.30am (start time)
Hope this helps.

Hi Rusty. Thanks for the detailed description of what you're trying. Hope it starts charging at the right time. I'll give this a go next time I charge although I won't hold my breath as my car always starts charging when I plug in and I haven't had whatever update you got.

 

[PeteC]

Hi PeteC
I have just finished trying different scheduled charging settings. Before the update it didn't seem to wait for the start time, it just started when I plugged it in. If I clicked finished charging on the app it wouldn't charge at the start time . The one that works now and I've tried it twice is......
Car in ready (Drive mode). Check charging schedule in car and cancel app schedule. Open flap, lock car then plug in cable (blue light is on and then went off). Checked app and the schedule was the same as car. Have plugged car in now and will check up to 00.30am (start time)
Hope this helps.

Just a quick update. I followed your procedure and, as I expected really, it didn't stop the car from charging just after plugging in the lead. It did give me a glimmer of hope as the green light came on but then turned blue again, but 30 seconds later it was back to green! I guess it will be like this until I get whatever update you had. Thanks again for your help.

 

[maskull]

Yep, I think these dealer SOH reports are a bunch of bollox personally

I wonder about this too . On my first service on my Pre FL MG5 LR the SOH was reported as 96% . On my second service last week it was recorded at 90% .
I did my end of month trip reset today and the range came back as 246 miles ( driving style set to normal ,heater off ) . Surely , if my battery was down by 10% , the range should show 225 miles ? Or am I missing something ?

 

[siteguru]

What is the WLTP range for your car? (I know that some cars reset the GOM to the near-enough WLTP figure regardless of SOH).