ZS EV LR - battery charge level wrong? (sticking at charged level)

[Will C]

Hi all, I’m three weeks into my ‘22 ZS EV LR ownership and loving it. Has anyone seen the battery charge level “sticking” at the level it reached at the end of the last charge? About 11 miles ago I took it from about 20% to 49% charge on a 50kW charger (thanks Tesco) then from 50% to the target 80% on my home 7kW charger. Since then, the display has stayed on 80% charge, 204 miles. Seems a bit suspicious to me. I’m thinking to drive it for another couple of commutes to see what it does and if it’s still the same then try charging it up to 100% and see if the same thing happens from there. Anyone experienced anything similar?

 

[Lovemyev]

Our ZS EV LR has returned a consistent predicted range of 211 miles, after setting a charge limit to 80% after charging from our home A/C wall box.
It has never been charged from a D/C rapid unit as of yet.
It is 6 months old and covered 6,000 miles since March 2022.
Make sure you remember to reset BOTH of your trips prior to charging, this will give you a more accurate predicted range after your charge has completed.
You could try charging to 100% SOC and then allow the HV battery to continue to carry out a balance cycle.
But I would try the trip reset first !.

 

[hmadsen]

Ours did this once or twice in the 4 months we owned it, tended to be very slow to update after a charge.

This would manifest itself as the % staying at the "charged to" %

Usually after a while it started updating, and was predictably decreasing a lot faster than normal, but it did just decrement, it did not suddenly re-evaluate and drop it by 10% at once.

 

[Will C]

Ours did this once or twice in the 4 months we owned it, tended to be very slow to update after a charge.

This would manifest itself as the % staying at the "charged to" %

Usually after a while it started updating, and was predictably decreasing a lot faster than normal, but it did just decrement, it did not suddenly re-evaluate and drop it by 10% at once.

Thanks. That seems to be the case with me. This morning I drove it to work and it started dropping (now down from 80% to 78% after the 6 mile run to work). But for sure, for the first 11 miles after charging, it stayed showing 80%.

 

[Striker]

I have noticed something odd with mine after charging to 80%
My drive home (14 miles) uses 4-5% on average and this is pretty consistent

However when I charge to 80% at work, I get home showing about 78%
It only seems to do this after an 80% charge!?

 

[Gadget Geek]

Yes, I've noticed it sticks at 80% for a while. I put it down to it charging to the top end of 80% rather than the lower end (80.9% rather than 80.1%).

 

[Will C]

Yes, I've noticed it sticks at 80% for a while. I put it down to it charging to the top end of 80% rather than the lower end (80.9% rather than 80.1%).

In my case it seems to be more than the rounding of the 80%. That would only equate to 2-3 miles, whereas I did 12 miles before it budged from 80% down to 79%. Similar behaviour though, for sure. Next charge I might take it to 90% or 100% to see if it does something similar.

 

[N2STY]

It does it at 90 as well after a charge

 

[MG Jan]

Mine (2 weeks old) did this too after a home charge to 50%. Next morning it displayed 51% in the car and on the app.... made 4 journeys totalling around 40 miles and neither %age or predicted range have budged! Has anyone contacted their dealers about this issue?

 

[Lovemyev]

I have found in our Trophy LR there is a very small difference between what the App reports as a predicted range and what the car reports.
Am I concerned, not at all to be honest !.
The same can seen if you check the 12 volt battery voltage status on the App and then on the actual display inside of the car.
I tend to believe the "in car" display over the App report myself.

 

[Will C]

Mine (2 weeks old) did this too after a home charge to 50%. Next morning it displayed 51% in the car and on the app.... made 4 journeys totalling around 40 miles and neither %age or predicted range have budged! Has anyone contacted their dealers about this issue?

Not reported by me. Strangely on my next charge it didn’t happen. Started “counting down” the charge % from 80% as it should.

 

[AreFriendsElectric]

I am shortly due to receive my Trophy long range. For day to day journeys I am obviously only going to charge the battery up to 80%. In terms of maintaining the battery life, would it do damage if I charge the battery back up to 80% capacity after daily usage for example? Or would it be best to let the battery go down to 20% for example & then charge back up to 80%?

 

[N2STY]

I charge mine everyday backup I normally use 20% to 30%
apparently 4 charges at 25% is classed as one charge cycle same as 0% to 100%

 

[Will C]

I am shortly due to receive my Trophy long range. For day to day journeys I am obviously only going to charge the battery up to 80%. In terms of maintaining the battery life, would it do damage if I charge the battery back up to 80% capacity after daily usage for example? Or would it be best to let the battery go down to 20% for example & then charge back up to 80%?

Good question. I run mine down to about 20% each time then back to 80% rather than more frequent small top-ups. Takes me about a week to get down to 20% each time. Friday night is charge night!

 

[Lovemyev]

My usual schedule is to charge up 80% which gives us a predicted range of around 211 - 212 miles.
Then use the car until it drops back to about the 40% mark.
This can take a few days or a week sometimes ?‍ .
Then I reset both trips and charge back up to 80%.
I find by doing this, it really fits in well into our 5 hour window of our much cheaper off peak tariff.
Running the car lower than this, is no problem because it still leaves us with plenty of range.
But I do NOT intend to charge on the vastly more expensive day time rate.
Yes - I could charge over two nights to stay within the 5 hour window, but doing it this way suits our needs just fine !.
Over running and charging on the day rate, is clearly NOT going to happen due to the high cost.
I have the delay timer in the car, set to START charging 5 minutes after the off peak has commenced and then set to FINISH charging 5 minutes before the off peak finishes.

 

[N2STY]

Then I reset both trips and charge back up to 80%

Why would you do this why not let the car learn over a longer time it will be more reliable to the way you drive I have not reset my 2nd trip for over 2k and yes at 90% I get only 200 miles but its more truthful then keep resetting

 

[Lovemyev]

I just prefer to do it this way really, after going through all of the issues we experienced on the ZS EV Gen 1.
Issues surrounding loss of range / power with some owners, due to software bugs affecting the BMS system etc.
Battery degradation was an actual thing on our 2 year old Gen 1 ZS EV in only 20,000 miles covered.
Full 100% charge and balance and trips reset, declared a predicted range of 163 miles after the BMS update.
As time moved on, that predicted range reduced slowly.
Same charging schedules, same journeys etc etc.
Full charge and balance was at a consistent 154 miles now.
So, I am just more comfortable resetting the trips each time, when I charge to 80% and then match that 212 miles of predicted range, to what MG predicts the car should hit at this 80% SOC.
This can be seen in the charging schedule screen.
This is not actual real world range of course, but I am looking for consistency here in the returns.
Not resetting the accumulated trip can be misleading in both a positive or negative way.
I am sure you can understand that after going through this type of thing, it can make you a little paranoid towards rushing in for the latest and greatest so called, software updates.
Once bitten and all that stuff !.

 

[Cycaduk]

I have found that quite often a charge to 80% on a rapid charger goes up a short while after the charge is finished. I figure it is mis communication somewhere.