No 80% charge limit

[Delascas]

@LionCiti what other MGS5 owners have discovered is this: you cannot move the slider to a lower % than the car is currently charged. So reading your post above . .

So I charge just now.

If your MGS5 is currently charged to 100%, you will not be able to move the slider at all. Please try driving the car, get the SOC to less than 80% . .then try again. If you get the SOC down to 79% or lower . . you should then be able to set the charge limit to 80% using that slider on the main charging screen.

 

[LionCiti]

@LionCiti what other MGS5 owners have discovered is this: you cannot move the slider to a lower % than the car is currently charged. So reading your post above . .

If your MGS5 is currently charged to 100%, you will not be able to move the slider at all. Please try driving the car, get the SOC to less than 80% . .then try again. If you get the SOC down to 79% or lower . . you should then be able to set the charge limit to 80% using that slider on the main charging screen.

Hi. My battery level was at 40% level when I try that. Will take a picture of the screen when it’s time to change and see whether I am on the right screen
Thanks

 

[gus]

Along similar lines, if I am not charging I have to swap to the 100 years version of the app to get to the battery charge levels, the white version shows the battery range and percentage but there is no way of setting the charge levels

 

[Snooooze]

Hi All,
Any Australians here with MG S5 able to change the "Charge to Level" in the app or on the dash. Can't see were to do it anywhere?

 

[TimothyN]

It's a shame that the Battery University says that the optimum maximum for battery longevity is 65%, but we have to choose between 60% and 70%!

 

[Bam Bam]

Do all of you have LFP batteries in your S5?

If you have an LFP chemistry then there is no need to limit the charge. LFP is pretty robust.

According to another thread on here "Singapore MG officials insist that both [size] battery will be LFP."

[edit] Indeed, I've just looked up the Singapore MGS5 brochure and it boasts "Advanced Horizontal Lithium Iron Phosphate (LFP) layout isdesigned for remarkable stability, longevity and safety"

 

[TimothyN]

My understanding is that the "standard" battery is LFP and the "long range" battery is NMC.

I also thought, from the Battery University, that neither of them takes well to 100% charge?

There are ever so many YouTube videos on the subject.

 

[TimothyN]

Are the best two I've seen.

 

[LionCiti]

Heard and read that it is good to charge the LFP to 100% occasionally so that the range is more accurate. I think it states that in the product manual too

Thus I am doing it like 100% once monthly with rest around 80%

In Singapore. license to use the car is for 10 years only so need to maintain battery health

 

[TimothyN]

Yes, that is to do with the flatness of the curve for LFP. It's difficult for the technology to know where on the voltage line it sits, whereas, with NMC, the line is steeper so it's easier to know where you are.

I don't think that that makes it good for the battery, but it is necessary if you want to know accurately what your range is.

 

[TimothyN]

By the way, there is another marginal argument for not charging to 100%, which is that if you do, you initially don't have regenerative breaking or one pedal driving, so the car could behave dangerously differently.

 

[Bam Bam]

Personally I'm not bothered, regen gradually becomes available as spare capacity becomes available.

Those who are bothered can consider complaining to MG for not allowing the LFP batteries to be limited to 80%.

In the meantime, those who are that bothered to limit the charge can limit the amount of charge:
1. through their charger. Mine has a maximum charge limit.
2. setting a time limit to charge up, so that it will stop at the required percentage.

Would require updating every time you charge though so it would be fiddly.

 

[Bam Bam]

My understanding is that the "standard" battery is LFP and the "long range" battery is NMC.

I also thought, from the Battery University, that neither of them takes well to 100% charge?

There are ever so many YouTube videos on the subject.

In Singapore (and perhaps all SE Asia) it seems that the larger battery is also LFP.

 

[TimothyN]

...it's all a bit obscure.

According to ChatGPT:

In Singapore, the MG S5 EV (also called the MGS5 EV) is sold in a single Luxury trim, featuring a 62 kWh LFP (lithium iron phosphate) battery Wikipedia+15Wikipedia+15Sgcarmart.com+15. Despite some earlier internet info suggesting higher-density NMC chemistry, MG's official Singapore lineup uses the more robust, durable LFP variant

In the UK, the MG S5 EV (MGS5 EV) is offered with two different battery technologies, depending on the trim:

---

1.​

• Chemistry: Lithium Iron Phosphate (LFP)
• Usable capacity: ~47 kWh net
• Range: ~211 miles (WLTP)
• Benefits: Excellent long-term durability, safety, and longevity, making it ideal for frequent charging cycles Mail & Guardian+15The Independent+15Wikipedia+15.

---

2.​

• Chemistry: Nickel Manganese Cobalt (NMC) Lithium‑Ion
• Usable capacity: ~62 kWh
• Range: Up to ~298 miles (WLTP) depending on wheel size and trim Wikipedia+2Wikipedia+2Wikipedia+2The Independent+2Electrifying.com+2Top Gear Italia+2.

Why the Chinese think that different battery technologies are appropriate in different territories is anyone's guess. Presumably tariffs and local regs.

 

[Bam Bam]

Why the Chinese think that different battery technologies are appropriate in different territories is anyone's guess. Presumably tariffs and local regs.

I expect it is because in the UK we are assumed to value things like acceleration over cost and longevity.

Probably something in this - I remember a few years ago my Dad (not an EV owner but EV curious) saying he wasn't sure Tesla were making the right decision by moving to LFP.

 

[TimothyN]

Um.

Wouldn't you think that the person buying the long range batteries would value, um, long range?

 

[Bam Bam]

Um.

Wouldn't you think that the person buying the long range batteries would value, um, long range?

By longevity I meant that LFP should do nearly 3x the number of cycles as NMC.

So you could get, say, 600k out of a battery pack [if used intensively] rather than 200k.

 

[FCat53]

It's a shame that the Battery University says that the optimum maximum for battery longevity is 65%, but we have to choose between 60% and 70%!

What the hell difference does it make? Whatever dodgy algorithm the 'Battery University' use to issue these juju figures, who knows. Just refer to a proper battery chemist , it depends on the specific battery chemistry, and most will generalise and say, storage at about 50% is good, and a daily charge level below 80% will give good battery life.

 

[FCat53]

Yes, that is to do with the flatness of the curve for LFP. It's difficult for the technology to know where on the voltage line it sits, whereas, with NMC, the line is steeper so it's easier to know where you are.

I don't think that that makes it good for the battery, but it is necessary if you want to know accurately what your range is.

Not correct , it also maximises the total battery range by cell balancing in any chemistry, so the minimum cell voltage applies to all, rather than an out of balance limiting the bottem end.

 

[Bam Bam]

What the hell difference does it make? Whatever dodgy algorithm the 'Battery University' use to issue these juju figures, who knows. Just refer to a proper battery chemist , it depends on the specific battery chemistry, and most will generalise and say, storage at about 50% is good, and a daily charge level below 80% will give good battery life.

The point of a battery is to use it, not to maintain the health for as long as possible.

Some ways of using it might degrade it very quickly and those should be avoided. Leaving an NMC battery at 100% or any battery at 0% for a long time will cause it damage.

There is some evidence that using batteries regularly is good for them, so the lesson I take is just don't do the things above and it will do fine.