Reassuring MG5 quality update from Cleevely EV

Does the SOH reduce more due to milage or age?

Probably mileage, but bear in mind that a high miler may be DC charges a lot more. I suppose I'm saying it is multifactorial with a bit of luck thrown in.

Jomarkh said:

Does the SOH reduce more due to milage or age?

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Depends. The battery will degrade by itself without any miles at all, especially when left at a high state of charge for a long time. See this study: [2103.02166] Electrochemical Modeling of Calendar Capacity Loss of Nickel-Manganese-Cobalt (NMC)-Graphite Lithium Ion Batteries

It will also degrade faster with rapid charging and charging to a high state of charge often, something I imagine these guys do to be able to get to their jobs in good time, so it does bode well.

Jomarkh said:

Does the SOH reduce more due to milage or age?

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Generally speaking: mileage, i.e. number of charge/discharge cycles.

If you compare two 1st gen EVs built in 2012 for example, the one with the lower mileage will have a better SoH

MickeySw said:

Generally speaking: mileage, i.e. number of charge/discharge cycles.

If you compare two 1st gen EVs built in 2012 for example, the one with the lower mileage will have a better SoH

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I'm not so sure about that. Coming from the LEAF community, they're all over the place. Some really high mileage cars are still doing very well, whilst some low mileage cars have totally shot batteries. It seems to have just as much to do with environment and charging habits/management behaviour as it does number of cycles/time. At least with earlier cars such as the LEAF.

Depends how you charge. e.g. a lot of rapid DC charging will degrade the battery more than a lot of AC charging. Probably how you drive also affects it too.

Jaumg said:

Depends. The battery will degrade by itself without any miles at all, especially when left at a high state of charge for a long time. See this study: [2103.02166] Electrochemical Modeling of Calendar Capacity Loss of Nickel-Manganese-Cobalt (NMC)-Graphite Lithium Ion Batteries

It will also degrade faster with rapid charging and charging to a high state of charge often, something I imagine these guys do to be able to get to their jobs in good time, so it does bode well.

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From what I can see, James's car is treated like crap, used & abused just like any work van, and no doubt has been rapid charged extensively. It's not serviced in accordance with MG's schedule at all either (which is admittedly mainly just bollocks anyway to extort revenue on pain of warranty exclusion!)

All that for over 150k in just 3 years!, It really does bode extremely well for reliability. I do think time will show more corrosion issues than we're used to seeing these days on modern cars though. This is the first car of the modern era (To me that's post about 1985!) that just has paint on the sills and nothing else! Look around, every other car you see (when not covered in cladding) has plasticised sealant sprayed along the sills prior to painting to resist road debris chipping. The short rot though warranty at 7 years is a clue as well (normal today is 10/12 years)

So get those mud flaps fitted, they're a must on the 5!, wash the underside properly frequently and keep an eye on things. (Unless your renting one for 2/3 years at a time, then, who cares anyway!!)

Paulie68 said:

I'm not so sure about that. Coming from the LEAF community, they're all over the place. Some really high mileage cars are still doing very well, whilst some low mileage cars have totally shot batteries. It seems to have just as much to do with environment and charging habits/management behaviour as it does number of cycles/time. At least with earlier cars such as the LEAF.

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IIRC the LEAF never had any thermal HV battery management therefore factors like you mentioned have a big impact on SoH.

I’d still guess though, that out two LEAFs of the same vintage, in the same environment and with similar ‘usage/charging profile’ the one with (significantly) lower mileage comes out top.

MickeySw said:

IIRC the LEAF never had any thermal HV battery management therefore factors like you mentioned have a big impact on SoH.

I’d still guess though, that out two LEAFs of the same vintage, in the same environment and with similar ‘usage/charging profile’ the one with (significantly) lower mileage comes out top.

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All other factors being the same, yes, it would.

Funny. We met the hallowed MG EV at the Sep Blenhiem Palace EV event, it was its longevity and reliability that led to us buying one the next month. I must admit it had been thoroughly abused

MG decided to clear its inventory so we got a bargain.

Mudflaps on order