Vin Numbers for Faulty BMS update identification

[Lovemyev]

After charge and balance all zeroed, car has just shown 164 miles for normal and 182 for econ.

Yeah - That sounds about right on the money !.
My guess of the extra 20 miles on the GOM when selecting Eco mode was not that far out then .
G.O.M. is the word EV owners have come to use when referring to the reading provided in relation to your PREDICTED range.
It's a prediction based on a number of factors, driving style / weather etc etc.
Prediction has been translated by the EV community, into the word GOM - "Guess - O - Meter".
A prediction / guess of what the present state of charge EXPECTS you to achieve in range.
Sorry, but how old is your car and how many miles have you covered ?.
How do you charge the car, at home on a A/C 7kw wall box or the factory provide "Granny" lead.
Do you ever carry out an Rapid charges ?.
From memory ( but I could be wrong here ) a claim against the battery warranty would be looked into, when the battery SOH drops below 70% of the original capacity of the pack in that 7 years.
Of course it is impossible to know if anybody will be in this situation, but my guess would be that MG have a pretty good idea they will NOT replacing / repairing any packs in this time frame.
What does a new pack cost ??????.
That is the 99 dollar question.
But remember as time moves on, there WILL be more independent EV specialist coming on line that have the ability to repair / restore any faulty cells contained in the pack.
Extremely unlikely that every single cell of the pack could be become damaged.
EV packs have been proven to last WAY longer than a lot of people first thought.
You can become paranoid over battery health, which can spoil your enjoyment of the car.
Best suggestion I ever received about 7 years ago about battery health is this.
"Just charge, use and enjoy it".
Good advice !.

 

[Deleted member 7171]

GuessOMeter

 

[Delboy102000]

Thanks for that, whilst I knew what it meant I could not get the words and never would have. My car is a May 21 exclusive with 4000 miles on the clock. I charge at home with a 7kw Pod Point, and only use rapid chargers very rarely. The new BMS was installed a week ago and almost immediately I think I could see an improvement in the rate of power used per mile covered. Dodging about round here we seem to be getting about 3.2 miles per kilo.
I am very appreciative of your input, so thanks again.

 

[Lovemyev]

Thanks for that, whilst I knew what it meant I could not get the words and never would have. My car is a May 21 exclusive with 4000 miles on the clock. I charge at home with a 7kw Pod Point, and only use rapid chargers very rarely. The new BMS was installed a week ago and almost immediately I think I could see an improvement in the rate of power used per mile covered. Dodging about round here we seem to be getting about 3.2 miles per kilo.
I am very appreciative of your input, so thanks again.

You are very welcome, glad I could be of some help.
I see that your car is very young and you have are a fairly small usage case.
Your figures suggest that the pack is as good as it gets really.
MG recommend that you should carry out a balance process about once a month.
Rapid chargers are necessary for long trips of course, but generally are not seen as great for long term battery health, when used in excess.

 

[JodyS21]

My accumulated trip has a mind of its own. Since the last charge and reset it's showing 2.4 m/kWh. All the short journeys I've done since resetting it were between 2.7 and 3.1, so a 2.7 at minimum, how does it come up with 2.4 ?
I've resigned myself to the fact that none of the figures on the GOM or the trip mean anything in the real world and just use the battery gauge like a fuel gauge and fill up when I get to the last bar.
FWIW reset trip and charge last time showed 158 miles in Normal at 3 deg C.

One thing that I think messes up the trip data is when sitting in the car with it on and not going anywhere, obviously it's using up power.

 

[JodyS21]

New BMS installed last week. As informed by the group mileage dropped on recharge and voltage seems to be 449 instead of 456/7. ECO mode range with other stuff off 164, normal range 145. As stated previously hopefully range will recover after several recharges.

I think you probably know this really, but there is nothing to "recover", you never had the bad BMS so never had a problem.
Other than the fully charged voltage being 449 instead of 456 -ish, you won't notice any difference between having the older BMS and the new one (oh, except for regen at full charge)

 

[Delboy102000]

Agreed, but a journey that has regularly returned 2.9 k ph is now returning 3.3 or 3.4 each time. So in practice I have seen an almost immediate betterment in the figures. I am pleased!

 

[Delboy102000]

Still taking hours to equalise although I only have charged on home charger and Tesco pod points. Yesterday four hours to charge from 25% followed by six hours equalisation. Charge shows 450 volts, 154 miles on normal and 170 on e . Seems to be as it should.

 

[Lovemyev]

Still taking hours to equalise although I only have charged on home charger and Tesco pod points. Yesterday four hours to charge from 25% followed by six hours equalisation. Charge shows 450 volts, 154 miles on normal and 170 on e . Seems to be as it should.

The balance time process will reduce.
My first charge and balance had taken 12 hours !!!!!.
It is easy to be all consumed / paranoid about the battery health of your car.
Don’t let that happen, because the love affair will soon end !.
On the previous factory software a balance cycle would take anything from 30 minutes to about 1 hour.
That is not going to happen on the new software.
The BMS update has increase the buffer at the top of the battery and balancing is going to take longer.
When you get to a balance process of about 2 to 2 and half hours, then you are as close as it’s likely to get !.
Or at least that is what I have found anyway.
It can take a number of balance cycles to get back to what is seen as the new normal.
It depends on how much the imbalance is to start with.
You have remember that to conduct a balance, you have to charge to 100% first of course.
But if you are a small usage case, then you are charging the battery to the max and then finding it difficult to get rid of the range !.
The car will commence a balance again if you loose just one white blob from the battery gauge.
Therefore, you could charge and balance go for a small drive and put it back on charge again.
Another way is to run the heater for a while and then put it back on charge.
See, it can all become a bit of a obsession if you are not carefully !.
Don’t panic ? just charge and use.
Your figures look fine to me ?.

 

[Delboy102000]

you really are most helpful thank you. Actually I am not overly concerned, just sharing what has been happening and you explanation gives me something to measure against.
Have you ever measured miles range when driving around town on adaptive compared to using regen. I know the theory is the car will go further with regen but wondered whether the softer use of throttle on cruise means it comes out better or worse for the same route.

 

[Lovemyev]

you really are most helpful thank you. Actually I am not overly concerned, just sharing what has been happening and you explanation gives me something to measure against.
Have you ever measured miles range when driving around town on adaptive compared to using regen. I know the theory is the car will go further with regen but wondered whether the softer use of throttle on cruise means it comes out better or worse for the same route.

No sorry I have not tried that.
Not a big fan of the features to be honest.

 

[Gomev]

you really are most helpful thank you. Actually I am not overly concerned, just sharing what has been happening and you explanation gives me something to measure against.
Have you ever measured miles range when driving around town on adaptive compared to using regen. I know the theory is the car will go further with regen but wondered whether the softer use of throttle on cruise means it comes out better or worse for the same route.

ACC around town is great in heavy rush hour stop/start type traffic and for keeping you exceeding the speed limit. Other than those times I wouldn't use it as it obviously doesn't see traffic lights/junctions etc.
I don't have any numbers for comparing range but like any other feature, used in it's right context is a wonderful thing, used in the wrong place it is a terrible thing.

 

[Dave53]

Does anyone know where to access the vin number range of ZS Ev cars suspected of having the faulty patch installed.
My full charge voltage on a 2021 car is 455 volts and the range seems to drop fast even when driven at a steady 65 mile per hour. The other day I started a journey with a margin of 75 miles and ended with 30 mile margin after reducing speed to 50/55 mph and turning heater off. Does this sound like I have the bad patch.

Was it not the case they did a recall for the BMS that caused the issue, it was only on certain cars, most were corrected in China once they were alerted to the problem, but not certain, I do believe that MG UK will have a list, drop them an email with your VIN and ask if your car has any recalls

 

[Lovemyev]

Was it not the case they did a recall for the BMS that caused the issue, it was only on certain cars,

You are totally correct, only certain cars where affected.
Its a LONG story, but cars that received certain updates, between certain dates where the ones affected.
SOME cars that received the Comfort 2 update and the HV battery fuse update and the battery heater update ( which was with drawn ) was another way for it bug to cause problems to the car.
I am sure their are still some cars out there that has the buggy software.
For anybody who like to understand the "What & the Why's" to this problem.
Then this is a great article on the subject.

Update information

The MG5 recall is for the earlier activation of brake lights using Kers 3. The other item is the confirmation of 35 kg limit on the roof bars which requires an extra page being glued into the...

www.mgevownersclub.co.uk

 

[Pos1968]

When fully charged <b>and balanced</b>-

455v +/-2V - original good BMS
449v +/-2V - newer good BMS
Anything else v - get it to the dealer.

Can you tell me where I csn see this information please, confused new mg owner