51 or 64KW

[Bazarooni]

Seems there are differences with NMC and LFP that might make you think twice. I've copied a bit of an article on the differences below...

Cycle Life and Lifespan​

Cycle life is the number of charge-discharge-charge cycles a battery can sustain without any performance degradation. A single charge cycle is when the battery is discharged from its fully charged state and is then charged again.

A longer cycle life indicates a better battery lifespan. It is an important consideration as it directly reflects the value for money factor.

NMC Battery​

An NMC battery has an expected cycle life of about 2000-2500 cycles. It can provide full power for about three to four years but then suffers fast degradation.

LFP Battery​

An LFP battery has a typical cycle life of about 5000 cycles. It can perform optimally for seven to ten years, followed by slow degradation. In fact, high-quality Eco Tree Lithium LFP batteries come with a 6-year warranty.

Verdict: LFP technology produces a significantly better battery cycle life than NMC batteries and can last twice as long.

Then there's Depth of Discharge to consider, amongst other factors.

Full article is at Lithium NMC vs LiFePO4 - How to Choose the Best One for Your Needs - Eco Tree Lithium

Just something to consider.

 

[WalkingBootWeather]

Seems there are differences with NMC and LFP that might make you think twice. I've copied a bit of an article on the differences below...

Cycle Life and Lifespan​

Cycle life is the number of charge-discharge-charge cycles a battery can sustain without any performance degradation. A single charge cycle is when the battery is discharged from its fully charged state and is then charged again.

A longer cycle life indicates a better battery lifespan. It is an important consideration as it directly reflects the value for money factor.

NMC Battery​

An NMC battery has an expected cycle life of about 2000-2500 cycles. It can provide full power for about three to four years but then suffers fast degradation.

LFP Battery​

An LFP battery has a typical cycle life of about 5000 cycles. It can perform optimally for seven to ten years, followed by slow degradation. In fact, high-quality Eco Tree Lithium LFP batteries come with a 6-year warranty.

Verdict: LFP technology produces a significantly better battery cycle life than NMC batteries and can last twice as long.

Then there's Depth of Discharge to consider, amongst other factors.

Full article is at Lithium NMC vs LiFePO4 - How to Choose the Best One for Your Needs - Eco Tree Lithium

Just something to consider.

I'm certainly no expert in the subject, and it is difficult for us regular punters to access the information we need to make an informed decision. My only observation is that article above is put together by a company that seems to exclusively supply 12v LFP batteries. This is a different application to the traction batteries in EVs.

If you can achieve 200 miles in a cycle, and it is possible to get 2000-2500 cycles in a battery life that is a total range of 400,000 - 500,000 miles which is more than enough for most of us to worry about before car likely to be scrapped for other reasons.

Battery technology is moving forward at pace and it would be great if there was a source of unbiased information that we could refer to.

 

[amdmad]

I'm confused, are people going to buy this car,and keep it until the battery gets down to zero percent capacity in 25 years time?? Or keep it for 6 years,then who cares what capacity is left in battery?? My Leaf24 has lost 15% in 7 and a half years . Still enough for my daily needs .

 

[Ian Key]

I believe the battery is covered by the 7 year warranty if the servicing and maintenance is done by MG authorised garages. It says:

Lithium Ion High Voltage Battery
During a capacity check at an Authorised MG Repairer if it is determined that the lithium-ion high voltage battery has suffered a capacity drop below 70% of the original value at delivery of your new MG Electric/Hybrid Vehicle, the segment below 70% will be deemed excessive loss. Where possible the excessive loss portion will be repaired, if un-repairable the lithium-ion high voltage battery will be replaced with either a new or a remanufactured battery.

 

[tsedge]

Modern car batteries will last longer than the car, typically hundreds of thousands of miles and several decades and will have second lives repurposed as static energy storage batteries. This is true regardless of chemistry, whether NMC or LFP.

Early batteries were different and Leafs are different because they lack active battery temperature management, which dramatically shortens lives.

Just do the sums: 1,000 cycles x 230 miles = 230,000 miles lifespan. So the article is claiming 460,000 miles as the limit for NMC. Not many people drive that far in their lifetime, let alone one car.

Yes, LFP can typically do twice the cycles of NMC, but that is pretty irrelevant in a car (though not for home storage with daily cycles which is why they are popular there).

Your MG car battery will lose only a few percent capacity over the years you have it. Unless you are a high mileage taxi driver who keeps their cars for years and years, it makes no difference.

And, as was pointed out, the warranty protects you anyway.

 

[4ND]

I'm confused, are people going to buy this car,and keep it until the battery gets down to zero percent capacity in 25 years time?? Or keep it for 6 years,then who cares what capacity is left in battery??

Most probably neither. As ~ 90% of 'buyers' 'buy' a car on PCP, then the average timespan of the first ownership will be ~ 3-4 years. It's buyers #2 and #3 and #4 who the question really applies to- that person X who can't afford ~ £25-£32K for a new car now, might be buying it in 7 years time.