What To Check When Buying A Used Electric Car

You’ve read the standard used vehicle checklist. You know to run an HPI check, inspect the bodywork in good light, check the service history and take a proper test drive.

All of that still applies when. you’re buying a used electric car. But there’s a whole additional layer of checks that are unique to EVs, and getting them right is the difference between buying a used electric car with confidence and inheriting a battery that’s quietly on its way out.

This guide covers everything that changes when the vehicle you’re buying runs on electricity rather than petrol or diesel. Read it alongside our standard used vehicle checklist, and you’ll have the most complete picture possible before you commit.

Why Used EV Buying is Different

With a petrol or diesel vehicle, the engine is the heart of the car. You check the oil, listen for unsual noises, look for leaks, and assess the service history to get a picture of how well it’s been maintained.

With an electric vehicle, the battery is the heart. And unlike an engine, which either works of it doesn’t, a battery degrades gradually and invisibly over time. You can’t hear it wearing out. You can’t see it on a dipstick. And a used EV with a degraded battery can look and drive perfectly well right up until the moment you realise it’s only doing 120 miles on a charge that used to do 200.

That’s why the battery health is the single most important thing you can do when buying a used EV, and why its the first thing we’re going to cover.

The Battery: Your Most Important Check

What is Battery Degradation?

Every rechargeable battery loses capacity over time. It’s a fundamental characteristic of lithium-ion battery chemistry, the same process that means your phone holds less chagre after two or three years than it did when it was new.

In an electric car, this means the battery gradually loses it’s ability to hold a full charge. A brand new Nissan Leaf with a 40kWh battery might achieve 160-170 miles of real-world range. After five years and 50,000 miles of use, that same battery might only hold 85-90% of its original capacity, reducing real-world range to 135-145 miles.

That reduction might be perfectly acceptable depending on how you use the car. But you need to know about it before you buy, not after.

What is State of Health (SoH)?

State of Health is the metric used to express a battery’s current capacity as a percentage of its original capacity. A battery with 100% SoH is at full original capacity. A battery at 85% SoH has lost 15% of its original capacity.

As a general guide:

90-100%SoH – excellent. Battery is performing very close to new.
80-90% SoH – good. Some degradation but well within normal parameters for a used EV.
70-80% SoH – acceptable for the right price, but range reduction will be noticable. Factor this into your budget.
Below 70% SoH – approach with caution. Significant range reduction and the battery may be approaching the end of its useful life.

How Do You Check Battery Health?

This varies by manufacturer, which is one of the quirks of the used EV market.

Some EV’s display SoH in the infotainment system. Nissan leaf models from 2018 onwards show battery health in the settings menu as a series of bars, 12 bars represents full health. A reading of 9 bars or below on an older Leaf is a meaningful reduction.

Some EV’s require a dealer diagnostics tool. Renault Zoe, for example doesn’t display battery health to the driver, you need a renault dealer or a specialist EV technician to run a diagnostics check. Always insist on this before buying.

Some EV’s provide battery health reports on request. Tesla, for example, can generate a battery health report via its app or service menu. Ask the seller to show you this.

Third-party diagnostic tools. EV specialists and independent mechanics can read battery health data on most EV’s using OBD diagnostic equipment. An independent pre-purchase inspection from an EV specialist is well worth the cost for any significant used EV purchase.

The key rule: never buy a used EV without seeing some form of battery health data. If the seller can’t or won’t provide it, walk away.

Real-World Range: What to Actually Expect

Manufacturer range figures are measured under controlled conditions, typically the WLTP test cycle, which uses a mix of urban, suburban, and motorway driving at moderate speeds and in mild temperatures. Real-world range in the UK, particularly in winter, will almost always be lower.

Factors that reduce real-world range:

Cold weather – battery chemistry is less efficient at low temperatures. UK winters can reduce real-world range by 20-30% compared to summer figures.
Motorway speeds – the faster you drive, the more energy the vehicle uses. Motorway driving at 70mph uses significantly more energy than urban driving at 30mph.
Heating and air conditioning – climate control draws directly from the battery. In a petrol car, the engine generates waste heat that warms the cabin for free. In an EV, heating the cabin costs range.
Battery degradation – as covered above.

Before buying, research real-world range figures for the specific model and battery size you’re considering, not the manufacturer figure. Websites like ev-database.uk and owner forums are useful sources of real-world range data.

Then apply the battery SoH percentage to get a realistic estimate of what range you can actually expect from the specific vehicle you’re looking at.

Charging History: How the Battery Has Been Used

How a battery has been charged over its life matters almost as much as how many miles its covered. Charging habits directly affect the rate of battery degradation.

Rapid DC charging – the fast charges you find at motorways and public charging hubs, is convenient but harder on the battery than slower AC charging. A vehicle that’s been regularly rapid-charged will typically show slightly higher degradation than one that’s been charged predominantly at home on a slow charger.

Charging to 100% regularly – most EV manufacturers recommend charging to 80% for everyday use, reserving 100% charges for longer journeys. Regularly charging to 100% and leaving the vehicle at full charge for extended periods accelerated degradation.

Depleting to near zero regularly – similarly, frequently running the battery down to a very low state of charge stresses the chemistry and can accelerate degradation.

Some EVs record charging history in their onboard data, worth asking the seller about or having an EV specialist check. Fro most buyers this level of detail isn’t available, which is why battery SoH is the more practical metric to focus on.

The Battery Warranty: Your Most Valuable Piece of Paperwork

Most EV manufacturers offer a separate, longer warranty on the battery pack then on the rest of the vehicle. This is one of the most important pieces of paperworkd to chcekc when buying a used EV, and that’s surprisingly often overlooked.

Typical battery warranty terms from major manufacturers:

Nissan – 8 years or 100,000 miles, with a minimum 75% capacity guarantee
Renault – 8 years or 100,000 miles
Volkswagen Group (VW, Audi, Skoda, Seat) – 8 years or 100,000 miles
Tesla – 8 years of 100,000-150,000 miles depending on model with minimum capacity guarantees
Hyundai/Kia – up to 8 years or 100,000 miles depending on model
BMW/Mini – 8 years or 100,000 miles

What to check:

Is the warranty still active? Check the vehicles age and mileage against the warranty terms.
Is it transferable to a new owner? Most manufacturer battery warranties are transferable but always confirm.
What does it cover? Most warranties guarantee a minimum capacity threshold, typically 70-75%. If the battery drops below that threshold during the warranty period, the manufacturer should repair or replace it.
Has it been claimed against? If the battery has already been replaced under warranty, that’s actually a positive, it means you’re getting a newer battery, potentially with a fresh warranty start date.

A used EV with a valid, transferable battery warranty in good health is a very different proposition to one without. Factor this into what you pay.

Charging Equipment: Don't Overlook the Cables

This is one of the most commonly overlooked aspects of a used EV purchase, and one that can catch buyers off guard with unexpected costs.

What should come with the vehicle:

A Mode 2 cable – this is the cable that lets you charge from a standard three-pin domestic socket. Its slow, typically 8-12 hours for a full charge, but essential as a backup.
A Type 2 cable, for charging at public AC charge points and home wallboxes. This is the cable you’ll use most regularly.

Some EV’s also come with a Combines Charging System (CCS) or CHAdeMO cable for DC paid charging, though rapid charging cables are less commonly used as standard.

Replacement cables can cost £150-£300 depending on the type and brand. Always confirm what charging equipment is included before agreeing to purchase.

Home charging installation: If you don’t already have a home EV charger, budget for installation. A home wallbox, which charges most EV’s in 6-9 hours compared to 12+ hours from a three-pin socket, typically costs £800 – £1,200 installed. The governments EV chargepoint grant can reduce the cost for eligible buyers, check eligibility at gov.uk

Software: The Unique EV Check

Electric vehicle are increasingly software-defined, which means software updates can meaningfully change how the vehicle behaves, what features are available, and in some cases how much range it has.

Check the software version and whether the vehicle is up to date. For most EVs this is visible in the settings menu. For Tesla vehicles in particular, software updates deliver significant functionality changes, and as Tesla that hasn’t been connected to WiFi for updates may be missing some improvements that owners of newer software versions enjoy.

Check for any outstanding software recalls. Like mechanical recalls, software recalls are recorded against the vehicle’s VIN and should be visible through the DVLA’s free recall checker or the manufacturer’s own recall lookup tool.

Check the connectivity subscription status. Some EV’s require an active connected services subscription to use certain features, remote climate control, over-the-air updates, and app connectivity. These subscriptions may expire after a set period and can cost £150-£250 per year to renew. Check whether the subscription is active and when it expires.

The Test Drive: What Changes fro an EV

The standard test drive advice applies, drive on multiple road types, assess braking and steering, listen for unusual noises. But there are EV-specific things to pay attention to:

Regenerative braking – most EV’s offer adjustable levels of regenerative braking, which slows the vehicle when you lift off the accelerator and recaptures energy back to the battery. Check that regen braking feels smooth and progressive, jerky or inconsistent regen can indicate an issue with the motor or inverter.

One-pedal driving – many EV’s support one-pedal driving, where strong regenerative braking brings the vehicle almost to a stop without using the brake pedal. Test this if available and check it feels smooth.

Power deliver – electric motors deliver instant torque, so acceleration should feel smooth and linear from any speed. Hesitation, juddering, or unusual sounds under acceleration warrant investigation.

Thermal management – some EVs have active battery thermal management systems that heat or cool the batter to maintain optimal temperature. After a longer drive, check that the battery temperature hasn’t risen excessively, most EVs display this in the energy management screen.

Range estimate accuracy – what the range estimate during the test drive and see how it responds to different driving styles. An estimate that drops dramatically faster than expected during spirited driving, or that fluctuates wildly can indicate battery issues.

What Does a Finance Company Check on a Used EV?

Everything covered in our standard used vehicle checklist applies here too, HPI check, written-off status, stolen vehicle check, valuation. But for electric vehicles, there are a few additional considereations:

Valuation – used EV values have been more volatile over the last two to three years than petrol or diesel equivalents. New EV prices have dropped significantly as the market has matured and competition has increased, which has pulled used EV prices down with them. Finance companies are aware of this and will value used EV’s carefully, which is actually a useful check on whether you’re paying a fair price.

Battery condition – some lenders are now asking for battery health reports a part of the finance assessment on used EV’s, particularly for higher-value vehicles. This is a positive development, it means batter condition is being formally assessed as part of the lending decision rather than left entirely to the buyer.

Age and mileage criteria – lenders apply their standard age and mileage criteria to EVs as they would to any vehicle, though some are more cautious about older EV models where technology was less mature and degradation rates higher.

Renge adequacy – while lenders don’t assess whether a vehicle’s range suits your lifestyle, its worth doing this yourself honestly before committing. A used EV with 120 miles of real-world range is a very different daily proposition to one with 200+ miles, and a mismatch between your driving habits and the vehicle’s range is one of the most common sources of used EV buyer regret.

Used EV Buying: The Red Flags

Watch out for these warning signs specific to used EV purchases:

Sellers who won’t provide battery data health – if they can’t show you the SoH, assume the worst and walk away.

Range that seems too good to be true – an older EV claiming full original range without any degradation should be verified carefully.

Missing charging cables – especially Mode 2 domestic cable. Factor replacement costs into what you want to pay.

No service history for battery checks – some manufacturers recommend battery health checks at scheduled service intervals. No evidence of this isn’t a deal-breaker but it’s worth noting.

An expired battery warranty with high SoH deteriorations – if the battery warranty has expired and the SoH is already below 80%, you’re taking on full financial risk for any future battery replacement.

Significant battery replacement cost looming – batter replacement costs vary by model but can range from £3,000 to £15,000+ depending on the vehicle. Always research the battery

Used EV Quick Reference Checklist

HPI check completed
MOT history checked
V5C present and VIN matches
Service history checked
Bodywork inspected in daylight
Interior condition assessed
All electrics tested
Test drive completed on multiple road types

Ready to finance your used elelctric car?

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