MG4 LFP Battery state of health

[Rolfe]

I have read that battery degradation may be more time-related than distance-related, or at least that it's as much time-related as distance-related. So you might as well go out and have fun.

 

[Martinonline]

And I thought the Scots were thrifty! It costs to have fun. Still you can't take it with you so live life to the full.

 

[Rolfe]

My garage man was delivering subtle, coded messages not to go up the Hardknott pass again...

 

[clipdawg05]

I saw this video of them testing how far they could go after reaching 0% SOC in the MG4 SR. And they still did over 20km (12.5mi).

The numbers don't make sense. There is no way thats the 50.8 kW lfp version

 

[Rolfe]

Maybe at these very hot temperatures? But then they had four pretty chunky guys in the car.

 

[clipdawg05]

Maybe at these very hot temperatures? But then they had four pretty chunky guys in the car.

They had a consumption of 14.2kWh/100km.

It they had the LFP version, it would be 50.8 divided by 14.2 and it would give them a range of 357km.

Now the consumption of 14.2 seems a bit high for an average speed of 60km/h but that could be because of the chunky guys.

 

[Rolfe]

Fair comment.

 

[decrep]

Don't forget 60km/hr is the average speed, this includes all times they were stopped. It's not the average of when they were actually driving.
So the average speed could be higher, depending how much time they spent stopped.

 

[fatih]

My vehicle is a model with a mg4 lfp battery. After approximately 14 months and 46 thousand kilometers, the battery degradation rate is %3.33... what do you think it looks like?

 

[AlC]

I'm sure the LFPs initial degradation at least is mainly time based.

My 51 is about 18 months old. Very infrequently driven, only 6,700km on the clock. Car scanner shows my battery health at about 93%.

 

[T1 Terry]

The numbers don't make sense. There is no way thats the 50.8 kW lfp version

442kms divided by 7.3 hrs comes out to close enough to 60km/h, they deserve a medal for being able to drive an MG4 with 4 big blokes in it at a constant 60km/h, I'd have be in a 7 hr long 50km/h zone to do that

T1 Terry

 

[clipdawg05]

Don't forget 60km/hr is the average speed, this includes all times they were stopped. It's not the average of when they were actually driving.
So the average speed could be higher, depending how much time they spent stop

Don't forget 60km/hr is the average speed, this includes all times they were stopped. It's not the average of when they were actually driving.
So the average speed could be higher, depending how much time they spent stopped.

There are a lot of variables, but as an owner of an mg4 51kw, I am one hundred percent positive that they could not have gone 442 km on one charge.

The 64kw version seems the most possible suspect. Also correct me if I am wrong but I don't think the std version comes with a spoiler. Maybe it does in Thailand.

I'm sure the LFPs initial degradation at least is mainly time based.

My 51 is about 18 months old. Very infrequently driven, only 6,700km on the clock. Car scanner shows my battery health at about 93%.

I would agree, mine is 7500km , bought the 2023 std in July of 2024 with 0 on the clock. Had 96% , now 95%. Once it came off the assembly line and into my hands it lost 4 percent. I wonder at what state of charge it sat for so long to lose that much battery capacity.

 

[siteguru]

Thailand do have a Trophy spec MG4 with the 51kWh LFP battery pack. I'm fairly sure someone from Thailand on this forum has one.

 

[Rolfe]

Yes, Bjorn Nyland has driven a blue Trophy-spec 51 kwh LFP car in Thailand. I think MG reckons that the hot climate gives enough extra range for it to be a viable package.

 

[Bam Bam]

Thailand do have a Trophy spec MG4 with the 51kWh LFP battery pack. I'm fairly sure someone from Thailand on this forum has one.

Also EVs often have smaller batteries and less powerful motors in Asian countries (as they aren't competing so much with legacy overpowered ICE vehicles). They also are more likely to use LFP. So the equivalent model might have a smaller LFP battery.

 

[Buster72]

The new batteries and tech helping make EVs much cheaper

VW, General Motors and Ford have all revealed new cheaper EV batteries which contain less nickel. It'll help bring new EV prices down in the next few years.

www.thisismoney.co.uk

Volkswagen will start to use lithium-iron-phosphate (LFP) batteries that are cheaper than the nickel-manganese-cobalt (NMC) packs the firm currently uses in its EVs, while GM will use lithium manganese-rich (LMR) prismatic battery cells.

Seems like MG4 SE SR is already well ahead of the competition having had an LFP battery since 2022.

Both reduce battery cost of production by using less cobalt and nickel - some of the most expensive raw materials used in EV batteries.

 

[Rolfe]

During the summer of 2023 I drove to a particular car park in Glasgow quite often, pretty much always getting there on 75% charge. In 2024 this only happened once, on one of the few warm days we had.

On Wednesday, which was a nice day but still only about 16°C, I got there on 76%. Not honestly seeing significant range loss here.

 

[T1 Terry]

The new batteries and tech helping make EVs much cheaper

VW, General Motors and Ford have all revealed new cheaper EV batteries which contain less nickel. It'll help bring new EV prices down in the next few years.

www.thisismoney.co.uk

Volkswagen will start to use lithium-iron-phosphate (LFP) batteries that are cheaper than the nickel-manganese-cobalt (NMC) packs the firm currently uses in its EVs, while GM will use lithium manganese-rich (LMR) prismatic battery cells.

Seems like MG4 SE SR is already well ahead of the competition having had an LFP battery since 2022.

Both reduce battery cost of production by using less cobalt and nickel - some of the most expensive raw materials used in EV batteries.

Actually, I believe BYD was the first major manufacturer back in 2020 with their blade battery technology, those who built their own EV conversions were way before that, possibly 10 yrs or more.

JMEV, a Chinese manufacturer for the domestic market, party of the JAC group were the first to build cars with sodium ion batteries back in 2023. The car looks to be about the size of the first Mitsubishi imev, but claim a range of 251kms, dream figures for an early imev This is what the JMEV EV3 looks like JMEV EV3 Price, Range and Review - EV Database

With CATL releasing their new hybrid build battery (uses two different chemistry cells, LFP and Sodium ion) towards the end of the yr, it will be interesting top see how they perform. The hype is they will charge as fast as any other EV battery, yet not suffer the reduced battery life as a result, the energy to weight is supposed to be up there with NMC and other cobalt nickel cells, but none of the fire risks .... and the claim at the moment, very little capacity degradation over the quoted 12 yr cycle life ..... yet to see, but sounds promising .....

T1 Terry

 

[Everest]

It will be interesting to see if any manufacturers can overcome the power to weight and low temperature charge rate disadvantages of LFP vs. NMC.

The cynic in me thinks that manufacturers will start to use LFP more in the next few years because they are cheaper to produce. Then convince everyone that we all need to use LFP because they are inherently "so much" safer than NMC after years of telling us that NMC are safe enough!

 

[Bam Bam]

It will be interesting to see if any manufacturers can overcome the power to weight and low temperature charge rate disadvantages of LFP vs. NMC.

The cynic in me thinks that manufacturers will start to use LFP more in the next few years because they are cheaper to produce. Then convince everyone that we all need to use LFP because they are inherently "so much" safer than NMC after years of telling us that NMC are safe enough!

I don't doubt that cost is a major factor.

But people wouldn't put up with lower performance even if cheaper.

LFP has got better in terms of density and charge speeds over time, albeit starting a long way behind ternary batteries (e.g. NMC).

The new BYD Han L in China has LFP and is claimed to be the first car with megawatt charging, so the development in LFP is rapid, even if the european models are still using slower charging packs.