How much does it cost to replace an electric car battery in the UK?

Electric car batteries typically cost from £5,000 to £15,000 in the UK, according to Bumper. Which we know is a big range. Where the cost falls between that range depends on the size of the battery, the car’s model, and who replaces it for you. 

The good news is that very few drivers ever pay to replace their electric car’s battery. EV batteries are built to last, and they come with long warranties. So if something does go wrong, the bill is usually covered by the manufacturer, rather than you. 

If the battery is what's putting you off switching from petrol or diesel, you're not alone. 45% of people said battery safety and longevity worried them in a YouGov survey we ran in June 2026, asking 2,074 GB adults. 

TL;DR

• A full replacement electric car battery typically costs £5,000 to £15,000 in the UK, depending on the car and battery size.
• Very few drivers ever pay that. Batteries usually lose capacity slowly rather than failing, and faults during the warranty period are fixed by the manufacturer.
• New electric cars must come with a battery warranty of at least eight years or 100,000 miles, as confirmed by the Department for Transport.
• The battery warranty stays with the car, so a used EV is often still covered. Check the first registration date and mileage.
• If an electric car’s battery does develop a fault, a specialist can often fix just the faulty part for far less than a whole new battery.

The cost of replacing a battery in an electric car depends mostly on the size of the battery. Smaller cars have smaller batteries, so they sit at the lower end, and some come in under £5,000. Bigger and premium cars can go over £15,000. These are prices for a brand-new battery from the car's manufacturer.

Costs from Bumper, May 2026. Prices vary by model and garage, so treat these as a rough guide. 

A full replacement battery for a Tesla Model 3 or Model Y can cost £8,000 to £15,000 or more, again depending on battery size and the car's age (Bumper, May 2026). Tesla covers the battery for eight years, with a mileage cap of 100,000 or 120,000 miles, which varies by version. You can check the details on Tesla's UK warranty page.

The battery is one of the most expensive parts of an electric car. It's made up of thousands of cells, wrapped in cooling and safety systems, and it needs specialist kit and expertise to remove and refit. The bigger the battery, the bigger the bill.

For most drivers, very unlikely. EV batteries rarely fail. They lose a little capacity over the years, a bit like a phone that lasts slightly less between charges than when it was new. This is called degradation, and it happens slowly.

Battery health (sometimes called state of health) is how much energy a battery can hold now, compared with when it was new. A battery at 85% gives you roughly 85% of the range it had when it was new.

UK data shows most batteries stay healthy for years. Battery testing firm Generational's 2025 index, published on 18th February 2026, tested more than 8,000 used electric cars and vans. It found an average battery health of 95.15%. Even cars eight to nine years old had a typical battery health of around 85%. That's well above 70%, the level at which most battery warranties pay for a fix.

So will an eight-year-old EV still get you to work and back all week? With around 85% of its original range, for most people, comfortably.

Outright battery failures are rare too. In the US, battery tracker Recurrent found that just 0.3% of EVs built from 2022 onwards had needed a new battery, not counting manufacturer recalls (November 2025). That's US data from the cars Recurrent tracks, and there's no UK equivalent yet. But it shows how rarely modern batteries give up.

For more on how batteries age and how to look after yours, read our battery lifespan guide.

New electric cars sold in the UK must come with a battery warranty of at least eight years or 100,000 miles, whichever comes first. If the battery's capacity drops below 70% in that time, the manufacturer has to replace it. This is a legal requirement under the zero emission vehicle (ZEV) mandate, as the Department for Transport confirmed to Parliament in March 2025. So it's a minimum every new EV has to meet, not a perk some brands choose to offer, though some manufacturers offer more. 

The ZEV mandate is under consultation until 23rd October 2026, so the rules could change for future cars. The outcome of the consultation is expected in early 2027.

Usually, yes. A battery warranty normally runs from the date the car was first registered and usually stays with the car, rather than being linked to the owner. 

For example, a five-year-old EV with 50,000 miles on the clock could still have three years of battery cover left.

Before you buy a used EV, check:

• The first registration date, which is on the V5C logbook
• The mileage, using the free MOT history checker
• The warranty's mileage cap and capacity threshold
• Any servicing conditions you need to keep to

Older EVs may have been sold with different terms, such as a shorter warranty or a lower capacity threshold, so check the manufacturer's warranty booklet. Read our full checklist if you’re planning to buy a used EV. 

Battery warranties cover faults and loss of capacity. They don't usually cover accident damage, misuse or changes you've made to the car. Accident damage is a job for your insurer.

In our YouGov survey, 36% of people said repair costs worried them about getting an EV. The good news is that, in most cases, you won’t foot the bill. Here's who usually pays.

Every warranty and insurance policy is different, so check the small print on yours. If you're not sure what you're covered for, ask the warranty provider or your insurer.

Often, yes. A battery is made up of smaller sections called modules. If one develops a fault, an EV specialist can usually replace just that module rather than the whole battery, which costs far less. So if your car isn’t under warranty anymore, get the battery checked by a specialist before assuming you need a new one.

Two simple checks can make a big difference before you buy: 

1. Ask for an independent battery health report, which gives you the battery health as a percentage
2. And check how much of the manufacturer's battery warranty is left

Our used EV checklist covers everything else to look at when you see a car. Still not sure on whether a second-hand EV is right for you? Read our honest take on whether it’s worth buying a used EV. 

You can buy a second-hand EV through our partner car360, the UK's largest used-EV specialists. Here’s what you can expect: 

• Every car comes with an independent battery health report, so you can see how healthy the battery is on the car's page before you buy.
• Every car comes with at least three months' warranty, or the rest of the manufacturer's warranty if that's longer. This is on top of any manufacturer battery warranty the car still has.
• You can add an extended warranty for 12, 24 or 36 months. It covers EV parts like the battery, motor and charger. Battery cover includes faults and loss of capacity.

Rather not own the battery at all? Used EV leasing comes with servicing and maintenance included, and you hand the car back at the end. No fuss. 

Usually, yes. Most electric car battery warranties run from the date the car was first registered and stay with the car when it's sold. That means a used EV can still be covered. Check the first registration date on the V5C, the mileage cap and any servicing conditions in the manufacturer's warranty booklet.

Comprehensive car insurance usually covers battery damage caused by an accident or fire, but not wear and tear or a fault. Faults and loss of capacity are covered by the manufacturer's battery warranty instead. Policies vary, so check your insurer's wording on battery damage before you buy cover.

It depends on the car's value, its condition and what's wrong with the battery. A full new battery can cost more than an older EV is worth. But many faults can be fixed by replacing a single module for much less. Get a diagnosis and a quote from an EV specialist before deciding.

Very unlikely. The end of the warranty isn't an expiry date for the battery. Most keep working well beyond it, losing a little range each year rather than failing. UK data from Generational found eight to nine-year-old cars still had a typical battery health of around 85%, well above the usual 70% warranty threshold.

Not usually. Mileage on its own isn't a reliable guide to battery health. Generational's study of more than 8,000 UK vehicles found that EVs with over 100,000 miles often still had 88% to 95% battery health. How the car was charged and looked after matters more, so ask for a battery health report.