Red Flags: Signs a Used EV Might Have Problems

Red flags in the battery

Battery health well below normal for the age. The single most important one. A five-year-old car at 76% when the model typically sits around 88% at that age has either been treated badly or has a developing problem. Either way it's worth a good deal less than the asking price suggests.

A seller who won't discuss battery health. Vague answers, "it's fine", or steering you towards the mileage instead. Anyone selling a healthy EV is usually happy to talk about it.

Range that's dropped suddenly rather than gradually. Degradation is a slow curve. A sharp drop points to a fault rather than normal ageing.

Poor range that doesn't improve as the weather warms. Winter range loss is normal and temporary. If a car was poor in January and is still poor in June, that's not seasonal.

Any high-voltage warning light or fault code. Don't accept "it's just a sensor" without a specialist assessment. Battery, BMS and inverter codes need proper diagnosis.

Evidence of tampering with the battery management system. Third-party BMS work or aftermarket battery modifications void warranties and suggest someone has been trying to mask something.

Red flags in the paperwork

Outstanding finance. The finance company can repossess the car from you even though you paid. See our finance and write-off guide.

A write-off marker the seller didn't mention. Cat S and Cat N are not automatically dealbreakers, but a seller who conceals one is telling you something about the rest of the transaction.

Mileage that doesn't match MOT history. Timestamped readings at every test make discrepancies fairly easy to spot.

Seller's name and address don't match the V5C. A common thread in vehicle fraud. Walk away.

No V5C, or a promise it's "in the post". No.

Frequent plate changes. Occasionally innocent, sometimes used to obscure history.

An import with no clear history. Warranties are territory-limited, so an imported EV may not carry the cover you'd expect.

Gaps in service history, particularly around high-voltage work. You want to see who did it and whether they were qualified.

Red flags on the car itself

Uneven tyre wear across an axle. Points to alignment problems or a car that's never been rotated. Also a hint about how enthusiastically it's been driven.

Two new tyres and two worn ones. Usually means no rotation, sometimes means someone has covered up uneven wear cheaply.

Heavily corroded or scored brake discs on a low-mileage car. Suggests long periods of standing, which isn't good for a battery either.

Charging port damage, or a flap that doesn't latch. Test both AC and DC if you can.

A car that won't AC charge but will rapid charge, or vice versa. Points at the onboard charger or wiring rather than the pack, which is a very different repair bill.

Signs of water ingress. Damp carpets, misted lights, silt in the boot well or under seats, a musty smell. On an EV this is more serious than on a petrol car, because water damage near the pack can cause problems that emerge much later.

Mismatched panel gaps or paint. Ordinary accident-repair signs still apply.

A car that's been sitting unused for months. Lithium-ion packs dislike sitting at extremes of charge, and long storage can leave a mark on battery health.

Red flags in how it's being sold

Pressure to decide quickly. "I've got someone else coming this afternoon" is a sales technique, not information.

Reluctance to let you run a check. There is no legitimate reason to object to a history and battery check.

Won't provide the VIN before a viewing. A genuine seller has no reason to withhold it.

Meeting somewhere other than the registered address. Common in private sale fraud. Insist on seeing the car at the address on the V5C.

A price noticeably below market. Occasionally a genuine quick sale. More often there's a reason, and it's usually one of the items above.

Deposit requested before viewing. No.

The ones that aren't red flags

Worth saying, because anxiety about EVs makes people walk away from decent cars:

• High mileage with good battery health. Mileage matters far less on an EV than on a petrol car.
• Out of battery warranty. Not a problem in itself if the State of Health is strong and the price reflects it.
• A flat 12V battery. Cheap, common, and unrelated to the main pack.
• Some capacity loss. Every EV degrades. Normal degradation for the age is not a fault.
• Software glitches that an update fixes. Irritating, not structural.

The practical order

Run the checks before you travel, not after you've fallen for the car. A history and battery check from the registration costs a fraction of a wasted trip, and it turns most of the paperwork red flags above into a simple yes or no before you're standing on someone's driveway feeling awkward.