What a Used EV Battery Warranty Covers and How Much Is Left on Your EV
By Niccolò Ferrari, Voltest
TL;DR: Most factory EV battery warranties stay with the car when it is sold, and the most common term is 8 years or 100,000 miles from the day the car first went into service [2]. Capacity coverage usually pays only if the battery drops below 70% of its original capacity, and a salvage or other branded title can void the coverage. For each used EV, check the in-service date, the mileage cap, the title and open recalls, then test the battery before you tell a customer what is covered.
We have tested over 15,000 used EVs for dealers and auction buyers [1]. Fewer than 1 in 250 read below 70% state of health, the capacity level most battery warranties use. A capacity claim is rare as a result. On most used EVs, the warranty questions that matter are how much time and mileage are left, and whether anything has voided the coverage.
Key Takeaways
- Factory battery coverage usually stays with the car when it is sold, so a used EV keeps whatever time and mileage are left [3].
- The most common term is 8 years or 100,000 miles, counted from the day the car first went into service [2].
- Capacity coverage on most EVs starts below 70% of original capacity, and a capacity repair restores the battery to that level instead of making it new [7].
- A salvage, rebuilt or flood title can void battery coverage, so check the title on every auction EV.
- Test each car before you quote coverage, so you find a defect while the brand still covers it.
Does the EV battery warranty transfer to the next owner?
Factory battery coverage usually stays with the car when it is sold, so a used EV keeps whatever time and mileage are left on it. The details differ by brand, so read the warranty booklet for the car in front of you.
- Tesla. Tesla's warranty transfers at no cost to anyone who lawfully takes ownership after the first buyer [3].
- Hyundai. Hyundai lists the same battery term for original owners and later owners [4].
- Kia. Kia's manual says all remaining coverage transfers to later owners, except the 10-year powertrain warranty, which stays with the original owner [6]. Kia's EV battery coverage is listed separately from that powertrain warranty.
Customers can mix up the two. A buyer who hears "10-year warranty" on a used Kia may assume all of it carries over, so your salesperson should say which coverage transfers and which does not.
Remaining battery coverage is a selling point. Put it on the VDP and the window sticker, next to the battery report for that car.
How long is the battery warranty on popular used EVs?
The table lists the factory battery terms for EVs you are likely to take in on trade or buy at auction. Every term ends at whichever limit comes first. Terms can change by model year, so confirm them in the booklet for that car.
| Make and models | Battery warranty | Capacity coverage | Source |
|---|---|---|---|
| Tesla Model 3 and Model Y, Standard Range and RWD | 8 years or 100,000 miles | At least 70% of capacity retained | [3] |
| Tesla Model 3 and Model Y, Long Range and Performance | 8 years or 120,000 miles | At least 70% of capacity retained | [3] |
| Tesla Model S and Model X | 8 years or 150,000 miles | At least 70% of capacity retained | [3] |
| Hyundai Ioniq 5, Ioniq 6 and Kona Electric | 10 years or 100,000 miles, same term for later owners | 70% of original capacity | [4] |
| Kia EV6, EV9 and Niro EV | 10 years or 100,000 miles from the date of first service | Capacity loss below 70% of original | [5] [6] |
| Volkswagen ID.4 | 8 years or 100,000 miles | Net capacity of at least 70% | [7] |
| Chevrolet Bolt EV, Bolt EUV, Equinox EV and Blazer EV | 8 years or 100,000 miles | Not listed on Chevrolet's EV FAQ, so check the warranty booklet | [8] |
For a used EV, the coverage left is whichever runs out first: the years since the in-service date, or the miles left under the cap. For example, a Model Y Long Range that went into service in 2021 and now shows 90,000 miles has about 30,000 miles of battery coverage left, until 2029. Our post on the EV/PHEV battery warranty covers what that factory coverage does and does not protect for a dealer.
When does the battery warranty start on a used EV?
The clock starts on the day the car first went into service. That date can sit months away from the model year, and it has nothing to do with the day your customer buys the car. Kia calls it the date of first service: the earliest of delivery to the first retail buyer, the start of a lease, or the day the car went into use as a company vehicle [6]. Tesla's coverage starts on the day Tesla delivered the car new [3].
Demo cars, loaners and company cars start their clock before a retail buyer ever owns them. A low-mileage former loaner can have less time left than its odometer suggests.
To find the date, ask the brand's dealer to look up the VIN, check the original sale or lease paperwork if it is in the deal file, or read it from the service history.
What does the 70% capacity rule mean for a used EV?
Most EV battery warranties cover two things: defects, such as a failed cell or module, and capacity loss below a set level. For capacity, that level is usually 70% of original capacity during the warranty term. Normal, gradual capacity loss above that level is not covered [3].
A capacity repair also stops short of making the battery new. Volkswagen and Kia both say a capacity repair returns the battery to 70%, and Volkswagen notes the repair may not return it to an as-new condition [6] [7]. The same applies to replacements. Tesla says a replacement battery will have at least the energy capacity of the original battery, allowing for its age and mileage. The car comes back with a working battery that matches its age, which is not always a new one.
In our data, few used EVs come close to that level. The median car we tested with more than 124,000 miles still read about 80% state of health [1].
| Mileage at test | Median state of health in our tests |
|---|---|
| Under 31,000 miles | About 96% |
| 31,000 to 62,000 miles | About 89% |
| 62,000 to 93,000 miles | About 85% |
| 93,000 to 124,000 miles | About 82% |
| Over 124,000 miles | About 80% |
On most EVs, the years or miles run out before capacity falls to 70%. The coverage that matters on a typical used EV is the defect coverage, and the time left to use it.
If a car under warranty does test below 70%, or shows a cell fault, take it to the brand's dealer. The brand decides the claim with its own diagnostic, so treat a third-party report as the reason to book the visit and expect the brand to run its own test.
What can void or limit battery coverage on a used EV?
Check the title first, especially on auction EVs. Tesla may void its warranty on cars without a clean title, including salvage, rebuilt, flood-damaged, fire-damaged and total-loss vehicles [3]. Kia's manual excludes any car that has ever had, or should have had, a salvage title [6].
Damage and outside repairs come next. Factory warranties do not cover damage from accidents, fire or flood. Kia also excludes battery damage from submerging the battery, from leaving the car above 122°F for more than 24 hours, and from opening the battery enclosure without a Kia certified EV technician.
Before you quote coverage on an auction car, read the title history and the condition report for collision or water damage, and ask whether anyone has opened or repaired the battery.
How do you check how much battery warranty a used EV has left?
- Confirm the in-service date. Get it from the brand's dealer, the original paperwork or the service history, then add the warranty years to it.
- Check the odometer against the cap for that trim. Caps can differ within one model. Tesla gives Model 3 and Model Y Long Range cars a higher mileage cap than Standard Range cars [3].
- Read the title history. A branded title can void or exclude battery coverage.
- Run the VIN for open recalls. Use the NHTSA recall lookup [9]. Recalls can involve the battery itself. Volkswagen recalled 670 ID.4s from the 2023 and 2024 model years in 2026 to replace high-voltage battery cell modules as needed, at no cost [10].
- Test the battery. Check state of health and cell balance, so you find a defect while the brand still covers it. The Voltest battery report shows the factory battery warranty and the years and miles left on it for that VIN.
- Show it to the customer. Put the coverage left on the VDP and the window sticker, and keep the report in the deal file. Voltest's Hybrid/EV VDP optimization widgets show the battery report on your listings.
Our guide to how dealers check EV battery health by VIN covers the testing steps for auction and trade cars.
What should a used EV listing show about the battery warranty?
Shoppers compare used EVs online before they call. When the battery facts are on the listing, they arrive with fewer questions and your salesperson starts the conversation further along. For each used EV, show:
- The date the factory battery warranty ends and its mileage cap.
- The miles left under that cap at today's odometer reading.
- The battery test date, state of health and cell balance result.
- The estimated range from the test.
- Open recall status, with completed battery recalls noted.
- Whether battery coverage is available after the factory warranty ends.
Keep the same facts on the window sticker and in the deal file, so the listing, the car and the paperwork match.
Are plug-in hybrid and hybrid batteries covered the same way?
Plug-in hybrid and hybrid batteries carry their own factory coverage, and at some brands the terms differ from the EV terms. Hyundai covers hybrid, plug-in hybrid and all-electric batteries on the same 10-year or 100,000-mile term [4]. For other brands, check the booklet for that model year. Test plug-in hybrids the same way you test EVs. Voltest tests most EVs and plug-in hybrids sold in North America.
How should your team talk about battery coverage with a used EV buyer?
Used EV buyers ask about battery coverage. For each car, your salesperson should be able to say how much factory battery coverage is left, what it covers, and what the battery test showed.
When the car has years left, your salesperson can show the remaining warranty next to a clean battery report. When coverage is short or gone, your F&I manager can present battery coverage that starts where the factory warranty stops.
A plain way to say it, with the details for that car filled in:
"This car went into service in [month and year], so the factory battery warranty runs to [month and year] or [miles], whichever comes first. We tested the battery on [date]. It reads [X]% state of health, and the cells are balanced. This is the report."
Keep the language accurate. A factory warranty, a certified pre-owned warranty and a vehicle service contract are different products with different terms. Use the name on the contract.
What are the options when factory battery coverage is short or gone?
Some used EVs reach your lot with little or no factory battery coverage left. The car can still be a good retail unit if the battery tests well, and the buyer may want coverage for the years ahead.
Voltest Protect is a battery-focused vehicle service contract for used EVs sold through dealers. It is available to US dealers from November 1, 2026, and it comes in two programs. One covers the high-voltage battery. The other covers the battery plus the electric motors and electronic components.
To qualify, a fully electric car has to pass a Voltest battery test, which checks state of health and cell balance. If a covered part fails, the contract pays toward the repair at a licensed EV repair shop. Cars with branded titles, such as salvage, rebuilt, flood or lemon buyback, are not eligible. Voltest Protect is a vehicle service contract, not an insurance policy. Coverage is subject to the contract's terms, limits and exclusions, and it may not be available in every state.
See the EV battery extended warranty for used car page to set it up for your store.
FAQ
How long is the VW ID.4 battery warranty?
Volkswagen covers the ID.4 high-voltage battery for 8 years or 100,000 miles, whichever comes first, for defects and for net capacity of at least 70% [7]. Run the VIN for open recalls as well, because Volkswagen recalled some 2023 and 2024 ID.4s in 2026 to replace battery cell modules [10].
Does the Tesla battery warranty transfer to a second owner?
Yes. Tesla's warranty transfers at no cost to later owners [3]. The battery coverage runs 8 years with a mileage cap that depends on the model and trim, and a salvage or other branded title can void it.
Is the Hyundai or Kia 10-year battery warranty only for the first owner?
Hyundai lists the same 10-year or 100,000-mile battery term for later owners [4]. Kia limits its 10-year powertrain warranty to the original owner, and its manual says all other remaining coverage transfers to later owners [6]. Confirm the coverage for that VIN with a Kia dealer.
Can a third-party battery report be used for a warranty claim?
Use it to decide whether a claim is worth filing. The brand's dealer decides the claim with the manufacturer's own diagnostic, so expect the brand to run its own test.
Does the battery warranty require service at the brand's dealer?
Routine maintenance at an independent shop does not void a factory warranty by itself, according to the FTC [11]. Repairs are a different matter. Tesla's warranty does not cover damage from repairs made by a person or facility that is not authorized or certified to do them, and Kia excludes opening the battery enclosure without a Kia certified EV technician [3] [6].
Where can I find the battery warranty details for a specific EV model?
Look in the warranty booklet for that model year, on the brand's warranty page, or ask the brand's dealer to look up the VIN. The table above lists the terms for common used EVs.
Is a salvage-title EV still under battery warranty?
In many cases it is not. Tesla may void coverage on salvage, rebuilt, flood-damaged and total-loss vehicles, and Kia excludes cars that have ever had a salvage title [3] [6]. Read the booklet for that brand before you bid.
What happens when the battery warranty runs out?
The car keeps the same battery, and the brand no longer covers defects. Test the battery, price the car on the result, and offer battery coverage if the car qualifies. Our post on selling an EV after the battery warranty expires covers pricing and buyer questions.
Sources
- Voltest proprietary battery test data, over 15,000 used EV tests, October 2026.
- U.S. Department of Energy, Fact #913: The Most Common Warranty for Plug-In Vehicle Batteries Is 8 Years/100,000 Miles, February 2016.
- Tesla, New Vehicle Limited Warranty, North America, effective September 1, 2026.
- Hyundai Motor America, America's Best Warranty.
- Kia America, Kia Warranty.
- Kia America, 2024 Warranty and Consumer Information Manual.
- Volkswagen of America, ID.4 model page, high-voltage battery limited warranty footnote.
- Chevrolet, EV ownership FAQs.
- NHTSA, Check for recalls by VIN.
- NHTSA, Recall 26V028, 2023-2024 Volkswagen ID.4 high-voltage battery cell modules, January 2026.
- Federal Trade Commission, Auto Warranties, Routine Maintenance, and Repairs: Is Using the Dealer a Must?, July 2011.