Electric car battery warranties: what transfers to you
How EV battery warranties work on a used car: years and miles, the capacity threshold, whether cover transfers, and your Consumer Rights Act 2015 rights.
Updated
Most electric cars are sold new with a separate warranty on the traction battery, limited by years and by miles, whichever comes first. A manufacturer's battery warranty usually stays with the car when it is sold, so a used buyer often inherits whatever is left. The catch is in the terms: the start date, the capacity threshold that triggers a claim, and conditions such as servicing or software updates. Read those terms for the car you are buying, not a summary in the advert.
How battery warranties are usually structured
Each manufacturer writes its own terms, and they differ by model and by year. Most follow the same pattern:
- A time limit and a mileage limit. The cover ends at whichever is reached first.
- A capacity threshold. The warranty covers the battery falling below a stated percentage of its original capacity within the period, not just outright failure. Below that threshold, the terms usually say the manufacturer will repair or replace the battery or parts of it. Check what the remedy is in the terms for that model.
- Defects in materials and workmanship. Faults in the battery pack and its parts are covered as well as capacity loss.
- Exclusions. Damage from accidents, flooding, misuse or unauthorised repairs is usually excluded.
The battery warranty is normally longer than the warranty on the rest of the car. So a car can be outside its general warranty and still have years of battery cover.
Does the battery warranty transfer to a new owner?
Usually, yes. A manufacturer warranty is normally attached to the car rather than to the first owner, so it carries on when the car is sold, privately or through a dealer. Some terms ask the new owner to register or tell the manufacturer, and some conditions depend on the car's history. Check the handbook or the manufacturer's warranty page for the exact model and year.
A dealer's own warranty or an extended warranty bought later is a different thing. It may not transfer, and it may not cover the battery at all. Ask who provides the cover and get the policy wording. Our guide to used car warranties explains the different kinds.
Working out how much is left
The warranty usually runs from the date the car was first registered, not the date the current owner bought it. That date is on the V5C log book.
- Find the date of first registration on the V5C.
- Add the warranty period in years from the manufacturer's terms.
- Compare the car's mileage with the mileage limit.
- The earlier of the two end points is when the battery cover ends.
If the car was first registered abroad and imported, check with a dealer for the make that the warranty is honoured in the UK.
Conditions to check
Battery warranties can come with conditions. Before you buy, look for these in the terms and ask the seller for the evidence:
- Servicing. Some terms require servicing or battery checks at set intervals. Ask for the service history and the invoices.
- Software updates. Some manufacturers expect battery and charging software to be kept up to date. Ask whether updates were applied, and by whom.
- Repairs. Battery or high-voltage work done outside the manufacturer's network can affect cover. Ask for invoices for any such work.
- Health checks. A dealer can often run a battery health check and confirm the warranty status against the VIN. Ask for both in writing.
Our guide to used EV battery health explains what a state of health report shows.
How a warranty sits beside your legal rights
A warranty is extra to your rights in law. It does not replace them.
If you buy from a dealer, the Consumer Rights Act 2015 says the car must be of satisfactory quality, fit for purpose and as described. Section 9 lists durability as one of the aspects of quality, which matters for a part as costly as a battery. In the first 30 days you may be able to reject a faulty car for a refund. After that, the dealer gets a chance to repair or replace, and faults that show up in the first 6 months are presumed to have been there at delivery unless the dealer proves otherwise.
Section 30 of the Act makes a guarantee given to a consumer with goods binding on the person who gives it, under the conditions it sets out. Whether those conditions extend to a later owner depends on the warranty terms, which is another reason to read them.
Private sales are different. A private seller must describe the car accurately, but the satisfactory quality rules do not apply in the same way. The manufacturer's warranty may still help you, which makes it worth checking before a private purchase.
Frequently asked questions
Does an EV battery warranty transfer when I buy a used car?
A manufacturer battery warranty usually stays with the car when it is sold. Some terms ask the new owner to register. Check the handbook or the manufacturer's terms for that model and year, and ask a dealer to confirm the status against the VIN.
When does the battery warranty start?
Usually on the date of first registration, which is on the V5C. Count forward the years in the terms and compare the mileage with the mileage limit. Cover ends at whichever comes first.
What does the capacity threshold mean?
It is the percentage of original capacity below which you can claim. If the battery stays above it, normal ageing is not a warranty fault, even if the range has fallen.
Does a missed service void the battery warranty?
It can, depending on the terms. Some warranties require set servicing or software updates. Read the conditions and ask the seller for the invoices before you buy.