Does an EV battery warranty transfer when you buy a used electric car?
In most cases, yes. Manufacturer battery warranties are usually attached to the car, not the first owner, so they pass to you when you buy a used EV, as long as the car is still within the time and mileage limits. Most cover the high-voltage battery for eight years or 100,000 miles, whichever comes first, and promise a repair or replacement if capacity drops below around 70%.
The catch is in the detail: the clock starts from the car’s first registration, not from when you buy it, and some warranties have conditions about servicing. This guide explains what to check.
Last updated 27 October 2026. Warranty examples come from manufacturer and industry sources listed at the end.
Key takeaways
- Most EV battery warranties last eight years or 100,000 miles and guarantee around 70% of the original capacity.
- The warranty normally transfers to the next owner automatically, but check the manufacturer’s terms.
- The warranty runs from the date of first registration, so a five-year-old car has about three years left.
- “Whichever comes first” means a high-mileage car can be out of warranty long before eight years.
- A battery at 75% is usually still “working as intended” under a 70% guarantee.
- Independent used-EV battery warranties are now available, including one that pays £2,700 if the battery falls below a set threshold.
In this guide
- What does an EV battery warranty cover?
- How long do battery warranties last?
- Does the warranty transfer to a new owner?
- How to check how much warranty is left
- What if the warranty has run out?
- Frequently asked questions
- Sources and further reading
What does an EV battery warranty cover?
A battery warranty covers the high-voltage traction battery, the large pack that drives the car. It usually does two things:
- Covers defects and failure of the battery within the warranty period
- Guarantees a minimum capacity, typically 70% of the original, within that period
If the battery’s capacity falls below the threshold within the time and mileage limit, the manufacturer will repair it, often by replacing faulty modules, or replace the pack. It does not mean you get a brand-new battery: it means the battery is restored to at least the guaranteed level.
The warranty does not normally cover the small 12V battery that powers the car’s electronics, which is a separate and much cheaper part. Kia, for example, covers its 12V and 48V batteries for two years.
How long do battery warranties last?
Eight years or 100,000 miles with a 70% capacity guarantee is the norm. New cars that qualify for the government’s Electric Car Grant must come with a battery warranty of at least eight years or 100,000 miles.
| Manufacturer (examples) | Typical battery warranty | Capacity guarantee |
| Kia | 8 years or 100,000 miles | 70%, transferable |
| Volkswagen | 8 years or 100,000 miles | 70% |
| Tesla | 8 years, 100,000 to 150,000 miles depending on model | 70% |
| Toyota (battery electric) | 8 years or 100,000 miles | 70% |
Terms differ between models and model years, and older EVs sometimes had shorter or different cover. Always check the official warranty booklet or the manufacturer’s website for the exact car.
Does the warranty transfer to a new owner?
Usually, yes. Manufacturer warranties generally stay with the vehicle. Kia, for example, says its battery warranty is transferable and that this supports resale values. You do not normally need to pay or register anything, but it is worth contacting a franchised dealer with the registration number to confirm the warranty start date and whether any claims or exclusions are on record.
Things that can affect it:
- Servicing. Some manufacturers require the car to be serviced according to the schedule. Gaps in the history can complicate a claim.
- Accident damage and modifications. Damage to the battery from an accident, flooding or unauthorised repairs is not covered.
- Write-offs. A car that has been written off may have restrictions. Run a car check to see the write-off history.
- Imports. Grey imports may not carry UK warranty cover.
How to check how much warranty is left
- Find the date of first registration on the V5C logbook or in a car check. Add eight years (or the manufacturer’s term).
- Check the current mileage against the mileage cap, and look at the MOT history for consistent mileage readings.
- Ask a franchised dealer to confirm the warranty status from the registration or VIN. Some manufacturers have online checkers.
- Ask the seller for the service history and any battery reports.
- Get a battery health test so you know how far the battery is from the warranty threshold.
What if the warranty has run out?
Older EVs can still be good buys, but the battery becomes your risk. Bumper estimates full battery replacements in the UK typically cost £5,000 to £15,000, though many problems can be fixed at module level for less, and complete failures are uncommon. Our guide to battery degradation explains how much capacity cars typically lose.
Options to reduce the risk:
- Buy with a battery certificate and cover. Since July 2026, battery tester Aviloo has offered a UK battery warranty for used EVs. If a second test within 12 months or 20,000km shows the battery below a vehicle-specific threshold, the owner receives £2,700. Some dealers include it with Aviloo’s certificate.
- Use your consumer rights. Buying from a dealer gives you rights under the Consumer Rights Act 2015 if the car is not of satisfactory quality. See our guide to consumer rights when buying a car.
- Consider an approved used scheme. Manufacturer approved used EVs often come with extra warranty and battery checks. See approved used vs used.
- Price it in. A car with little warranty left and an average battery report should be cheaper than one with years of cover.
Frequently asked questions
Is an EV battery warranty transferable?
Usually. Manufacturer battery warranties generally stay with the car and pass to the next owner, but check the terms for the specific brand and model.
When does an EV battery warranty start?
From the date of first registration, not from when you buy the car. A car registered in 2021 with an eight-year warranty is covered until 2029.
What does a 70% battery warranty mean?
If the battery’s capacity falls below 70% of what it held when new within the warranty period, the manufacturer will repair or replace it to bring it back above that level.
Does the battery warranty cover the 12V battery?
Usually not. The small 12V battery is covered separately, often for a much shorter period.
Can I extend an EV battery warranty?
Some manufacturers and third-party providers offer extended cover, and independent used-EV battery warranties now exist. Read the terms carefully, especially the capacity threshold and claim limits.
Sources and further reading
- Kia UK: Electric car battery cover and EV warranty protection
- EVKX: EV battery warranty comparison
- AM Online: Mini Countryman and Renault 5 qualify for top-rate electric car grant
- Fleet News: Aviloo launches battery warranty for used electric vehicles
- Bumper: How much does an electric car battery cost?
About this guide: Rooster is a UK car insurance provider. This guide is general information for UK drivers, not legal advice. Warranty terms vary by manufacturer, model and year, so always check the official terms for the exact car.
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