Is Your MG4's Battery LFP or NMC? Here's Why That Matters When You Sell

Is Your MG4's Battery LFP or NMC? Here's Why That Matters When You Sell

Most MG4 guides talk about "the battery" as if every MG4 has the same one. It doesn't. Depending on which version you own, your MG4 is running one of two genuinely different battery chemistries, with different care needs and different degradation patterns, and knowing which one you have changes what you should actually check before you sell.

Before anything else, a quick word on where this is actually useful to you. Independent battery audits through EV TrustSeal currently work for MG owners in the UK, where MG's connected services integration is supported. In Australia, where the MG4 has been genuinely huge, our audit access is currently limited to Tesla and Polestar, with no MG expansion planned at this stage. MG doesn't currently sell cars in the US at all, and Canadian distribution hasn't launched yet either. So if you're a UK MG4 owner, the certificate at the end of this post is for you today. If you're anywhere else, the battery information below still applies to your car, you just can't get a certificate from us yet.

Two batteries, one badge

The MG4 is sold with two battery options, and they're not just different sizes of the same thing. The Standard Range pack, 51 kWh, commonly uses LFP, lithium iron phosphate, chemistry. The Long Range pack, 64 kWh, commonly uses NMC, nickel manganese cobalt, chemistry instead. Trim names vary by market and model year, so the safest way to know which you actually have is to check your vehicle's spec sheet or ask your dealer to confirm, rather than assuming from memory.

The distinction matters because these two chemistries age differently. LFP is the same family of battery behind BYD's Blade pack and the RWD Tesla Model 3 and Y: chemically more stable, tolerant of regular full charges, and known for a flatter long-term degradation curve. NMC offers more range for the same physical size but is the chemistry where the old "avoid charging to 100% daily" advice actually applies. Neither one is the wrong choice. They're simply different, and a used MG4 listing that doesn't say which one you're looking at is leaving out a genuinely relevant fact.

What's normal for each

Owner-reported readings on MG's own community forums give a useful, if informal, picture. LFP-equipped cars commonly show State of Health readings in the low-to-mid 90s after the first year or two, with the steepest part of the curve early and a flatter decline after that, consistent with LFP's known behaviour. NMC-equipped cars have shown similarly strong early readings, with some owners reporting 90%-plus SoH even well past 200,000 km of driving. Treat these as real-world anecdotes rather than formal fleet data, but they line up with the broader pattern seen across modern liquid-cooled EVs generally: meaningful degradation is the exception at typical mileage, not the rule.

The warranty, and what it actually promises

MG's current UK battery warranty, updated as of January 2025, covers the high-voltage battery for 8 years or 100,000 miles, with a guarantee of at least 70% of original capacity within that window. If a covered fault drops capacity below that floor, MG repairs or replaces the affected portion. The warranty is tied to the vehicle and transfers to each new owner while still in term, so a used MG4 within its warranty period carries that protection with it.

The same limit applies here as with every manufacturer warranty: it's a backstop for serious failure, not a report on your actual number. A car at 94% and a car at 71% both sit above or near that 70% floor without the warranty telling either owner or buyer anything specific about where they actually stand.

Why this matters more on a budget EV, not less

Here's the part that's specific to the MG4 rather than to EVs generally. On a car priced from the mid-twenties to low-thirties, a buyer's uncertainty about the battery is a proportionally bigger deal than the same uncertainty on a premium EV. A few thousand dollars of buyer hesitation is a rounding error against a $70,000 car and a genuinely painful chunk of a $28,000 one. Price-sensitive buyers negotiate harder per dollar, not less hard, and an unverified battery is exactly the lever they'll reach for.

That's precisely where a certificate earns the most, proportionally, of any car in this content series. For UK MG4 owners, EV TrustSeal reads your battery's actual delivered energy straight from your MG account's own connected services, no dongle, no workshop visit. Connect read-only, run one home AC charge from under 20% up to 80%, and your result arrives within hours as a VIN-locked certificate with a QR code a buyer can verify independently. Connecting is free, and you only pay $99 once your result is ready to unlock, which on a budget EV sale is a small fraction of the value it protects.

FAQ

Does the MG4 have an LFP or NMC battery? It depends on the version. The Standard Range 51 kWh pack commonly uses LFP, while the Long Range 64 kWh pack commonly uses NMC. Check your spec sheet or ask your dealer to confirm which your specific car has.

What's normal battery degradation for an MG4? Owner-reported readings typically show the low-to-mid 90s percent State of Health within the first couple of years, with the steepest drop early and a flatter curve after, in line with modern EV battery behaviour generally.

What does the MG4's battery warranty cover? MG's current UK terms cover the high-voltage battery for 8 years or 100,000 miles, guaranteeing at least 70% of original capacity within that window. The warranty transfers to subsequent owners while still in term.

Can I get an independent battery check for my MG4? Currently available for MG owners in the UK. Not yet available in Australia, where audit access is limited to Tesla and Polestar, and not applicable in the US or Canada, where MG doesn't currently have an established retail presence.

Chris Mansour is the founder of EV TrustSeal. He spent 20 years as an aircraft engineer at Qantas certifying components where the cost of error was never acceptable, and now applies the same discipline to EV battery verification.

If you're in the UK and selling your MG4, a TrustSeal certificate protects more of your asking price than on almost any other car in this series. Connect free at evtrustseal.com and pay only when your result is ready.