What to Check Before Buying a Second-Hand EV

Even now that the Clean Car Discount is gone and road user charges apply to electric vehicles, running on electrons is often still the cheapest way to keep your car moving. But buying used means asking a few questions you'd never think about with a petrol car. Here's what to look for.

The EV-specific checks

Do the long-term savings justify the price?

EVs still tend to cost more upfront, though the wave of Chinese-built models is steadily pushing prices down. Whether you come out ahead depends on your own situation: how far you drive each year and what power costs where you live. The more kilometres you cover, the faster the fuel and maintenance savings add up. It's worth running your own numbers before committing.

What's the battery's state of health?

The battery is the single most important part of any EV, and its condition shapes everything about how the car performs. The figure to look for is "state of health" (SoH), usually shown as a percentage. A brand-new battery sits at 100% and slowly drops from there. The good news is that EVs often display SoH right on the dashboard or somewhere in the infotainment menus, so no guessing is required. If you can't find it, a mechanic can run a diagnostic check. Make sure the remaining health will see you through the years you plan to own the car.

Does the range suit your driving?

Range tells you how far the car will go on a full charge, and most EVs calculate this from the battery's current health. Think honestly about your daily commute plus the occasional longer trip. For everyday driving, even a fairly degraded battery will usually cope fine. But if you regularly tackle long regional or highway runs, stopping to charge every 80 to 100km gets old fast, so make sure the range genuinely fits your life.

Can the battery be replaced?

Battery replacement is possible, but it's still an uncommon and immature part of the market. A few specialists swap out older packs, including some firms that refit early Nissan Leaf batteries. If this is something you might do down the track, research the cost first, because it should factor into what you're willing to pay today.

It also helps to understand that not all batteries age the same way. The first-generation Nissan Leaf used an older chemistry that degrades fastest, often a few percent a year, which is why high-kilometre early Leafs can show surprisingly low state of health. Swapping in a newer pack can dramatically extend their life, but it's a cost to weigh up. More recent chemistries hold up far better: the latest lithium iron phosphate (LiFePO4) batteries degrade very slowly, tolerate frequent fast charging, and can sit at a full charge for long stretches without much harm. In many cases the car will rust out long before the battery gives up. If you're choosing between examples, battery chemistry and age often matter more than the odometer reading.

Can you charge at home?

Home charging is where the real savings live. Check you've got somewhere sensible to plug in, whether that's a driveway or garage. If your car has a big battery and you run it down regularly, a standard three-pin plug probably won't keep up, and you'll want to budget for a dedicated wall charger.

Can you charge while you're out?

You won't always be at home, so it pays to know the public network works for you. New Zealand's charging infrastructure is still growing, and it thins out noticeably once you leave the main centres, though new stations keep appearing. Look up the chargers along the routes you drive most before you buy, so you're confident you won't get caught short.

Has the software been kept up to date?

Updates matter on any modern car, but for EVs they can genuinely improve range, performance and features. Ask the seller whether they've stayed on top of updates. It's a small thing that signals how the car's been cared for.

The checks that apply to any used car

Research the make and model

Search the make, model and year alongside "problems." Every car has someone complaining about it online, so stay level-headed, but you'll often surface genuine known issues worth watching for.

Take a proper test drive

A good test drive flushes out problems. If you're not mechanically confident, bring someone who is. An EV should be almost silent, so any odd knocks or rattles tend to announce themselves quickly.

Keep your expectations realistic

New Zealanders hold onto cars a long time. The national fleet averages over 14 years old, and used imports are typically around 12 years old when they arrive. With an older vehicle, expect some wear-and-tear costs and the odd niggle. A major failure soon after purchase, though, isn't reasonable.

Find a well-kept example

Look at how the car presents, because clean and tidy is a good sign. Ask whether it's been serviced before sale, request any inspection or service reports, and if it's had previous local owners, ask for maintenance records.

Get it inspected

If the car's a fresh import or has no service history, assume the worst. A pre-purchase inspection runs around $100 and will flag immediate problems, though it can't predict future ones. If it hasn't been serviced recently, consider negotiating a service into the deal, and tell the mechanic you want to know about any signs of neglect or trouble ahead.

Don't be scared of private sales

Buying privately can feel intimidating, but a private seller often knows the car's history and may have records going back years. If you're after something cheaper, say under $10,000, you'll find more choice privately, and the sale is often simpler with no upselling. The catch: private sales don't carry Consumer Guarantees Act protection and are usually "as-is, where-is," meaning problems become yours after purchase. Protect yourself by insisting on a warrant of fitness less than a month old.

If something goes wrong

Know your rights

You're protected by the Fair Trading Act and the Consumer Guarantees Act (the latter doesn't cover private sales).

Act fast

Don't sit on a problem for months or you risk losing your rights. Get an independent mechanic to confirm the fault.

Talk to the dealer

Lay out your case and say clearly what outcome you expect.

Escalate if needed

The Motor Vehicle Disputes Tribunal offers independent resolution for just $50. It's a last resort, but even mentioning it can be enough to get a dealer moving.

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A healthy used EV can be superb to own: cheap to run, quiet, and a pleasure to drive. A little homework up front is all it takes to land a good one.