Every new electric vehicle sold in the United States comes with an EV battery warranty of at least 8 years or 80,000 miles, and most manufacturers go further, offering 100,000 to 150,000 miles of coverage. The warranty protects against outright battery failure and against the battery losing too much of its original capacity, typically anything below 70%. It transfers to the next owner when you sell the car, and federal law limits the reasons a manufacturer can use to deny a claim.
The details are where the money is. Mileage caps differ, capacity thresholds differ, and the list of things that can legitimately shrink your coverage is shorter than most dealers will suggest.
What the Battery Warranty Actually Covers
The warranty protects the entire high-voltage energy storage system. That means the lithium-ion cells, the modules that group them, the pack casing, the battery management system that monitors voltage and temperature, and the thermal hardware including coolant pumps, cooling loops, and fans. High-voltage wiring and connectors that link the pack to the drivetrain are usually included as well, since they’re integral to safe operation and not something an owner services on their own.
One component surprises people: the small 12-volt auxiliary battery that runs cabin electronics and wakes the main pack is not covered by the high-voltage warranty. It falls under the basic limited warranty, typically 3 years or 36,000 miles. When it dies (and they do, roughly every 3 to 5 years), replacement runs around $100 to $300 out of pocket.
Capacity Retention Is the Part That Matters
Total battery failures are rare. What the warranty is really doing for you is guaranteeing capacity retention: protecting against the gradual range loss every lithium-ion battery experiences over time.
Most manufacturers guarantee the battery will hold at least 70% of its original capacity through the warranty period. A few set the floor at 75%. If your battery drops below the threshold before the warranty expires, the manufacturer has to bring it back above the guaranteed level.1Legal Information Institute. California Code of Regulations Title 13 Section 1962.8 – Warranty Requirements for Zero-Emission and Batteries in Plug-in Hybrid Electric 2026 and Subsequent Model Year Passenger Cars and Light-Duty Trucks Anything above the threshold counts as normal degradation and won’t trigger a claim. A vehicle that launched with 300 miles of range and still delivers 220 (about 73%) doesn’t qualify. Drop to 200 miles (67%), and you likely do.
When a capacity claim is approved, the repair isn’t always a brand-new pack. Manufacturers reserve the right to replace individual modules, install refurbished packs, or make other repairs that restore total capacity above the guaranteed floor. The goal is to bring the pack back to a state consistent with its age, not to hand you a battery that’s better than what you started with.
How Long Coverage Lasts by Manufacturer
Regulators set the floor at 8 years or 80,000 miles. Most automakers exceed it, and the differences are big enough to factor into a purchase decision.
- Tesla: 8 years or 120,000 miles on the Model 3 and Model Y, extending to 150,000 miles on the Model S, Model X, and Cybertruck. All models carry a 70% capacity guarantee.
- Hyundai and Kia: 10 years or 100,000 miles, with a 70% capacity guarantee that transfers to subsequent owners at no cost.2Hyundai. Hyundai Warranty Coverage – America’s Best
- General Motors (Chevrolet): 8 years or 100,000 miles on models like the Equinox EV and Blazer EV, fully transferable.
- Ford: 8 years or 100,000 miles, with roadside assistance for the first 5 years or 60,000 miles that includes towing to a charger or dealer if you run out of charge.
The mileage cap is where the real variation lives. Someone driving 20,000 miles a year hits an 80,000-mile cap in 4 years; a 100,000-mile warranty covers most drivers for the full time period. If you commute long distances, pay closer attention to the mileage number than the years.
What Can and Can’t Void Your Warranty
Here’s where EV owners get bad information. You’ll hear that installing aftermarket parts or using an independent mechanic “voids your warranty.” In most cases, that’s not how the law works.
The Magnuson-Moss Warranty Act prohibits any manufacturer from conditioning a warranty on the consumer using a specific brand of product or service, unless the manufacturer supplies the product for free or gets a waiver from the Federal Trade Commission.3Office of the Law Revision Counsel. 15 USC 2302 – Rules Governing Contents of Warranties In plain terms, a manufacturer can’t refuse to cover your battery just because you installed aftermarket wheels, used a third-party charging cable, or had an independent shop perform routine maintenance.
The FTC has been direct about this. Its guidance states that “companies can’t void a consumer’s warranty or deny warranty coverage solely because the consumer uses a part made by someone else or gets someone not authorized by the company to perform service on the product.”4Federal Trade Commission. Nixing the Fix: Warranties, Mag-Moss, and Restrictions on Repairs A manufacturer can deny a claim if it can prove that a specific aftermarket part or unauthorized repair actually caused the failure. Install a third-party battery management module and the pack overheats? The manufacturer has a defensible reason to deny. Install aftermarket floor mats and the battery degrades? It doesn’t.
The burden of proof sits with the manufacturer. If you’re told your claim is denied because of an aftermarket part, ask for a written explanation identifying exactly how that part caused the failure. Vague denials don’t meet the legal standard.
Limits That Do Hold Up
Some exclusions are real. A manufacturer can enforce these:
- Physical damage from a crash, flooding, or road debris puncturing the casing. That’s a collision insurance matter, not a warranty matter.
- Unauthorized high-voltage work. If someone other than a certified technician opens the pack and modifies cells or internal wiring, the manufacturer can reasonably link a later failure to that work. Routine service like tire rotations or brake work at an independent shop is a different situation.
- Ignored software updates. Some manufacturers push over-the-air updates that adjust charging or thermal management to protect battery life. Skipping them can give the manufacturer grounds to argue a failure was preventable.
- Operation outside the vehicle’s design parameters. Sustained use in extreme heat above the manufacturer’s specified range, or commercial use like rideshare when the warranty was written for personal use, can trigger exclusions in some agreements.
Manufacturers track much of this through onboard data logs recording charging patterns, temperature history, and software versions. Dealers pull that data before making a coverage decision. Keeping your own service and update records gives you leverage if a denial looks unjustified.
The DC Fast Charging Myth
A persistent claim says frequent DC fast charging voids your battery warranty. It doesn’t. All major manufacturers explicitly cover normal use of fast charging. Fast charging generates more heat and can accelerate long-term degradation compared to Level 2 home charging, but degradation from normal use is exactly what the capacity retention guarantee exists to cover. Manufacturers designed their thermal systems to handle it and can’t penalize you for using the vehicle as intended.
The Maintenance You Shouldn’t Skip
EVs need far less scheduled maintenance than gasoline vehicles, but the items that exist matter for warranty compliance. Some battery cooling systems use liquid coolant that requires periodic checks or replacement. The Department of Energy advises owners to consult the owner’s manual for the specific schedule for their vehicle’s cooling system.5Alternative Fuels Data Center. Maintenance and Safety of Electric Vehicles Skipping a required coolant service gives the manufacturer a plausible argument that neglect contributed to overheating damage.
Filing a Battery Warranty Claim
If you suspect your battery has degraded past the guaranteed threshold or developed a defect, the process starts at an authorized dealer or manufacturer service center.
- Schedule a diagnostic appointment. The dealer connects to the battery management system and runs a state-of-health test measuring current capacity against the original specification. The test typically costs $100 to $150 outside of warranty, but should be free when you’re initiating a warranty investigation.
- Gather documentation. Bring service records, maintenance receipts for coolant changes or other scheduled items, and a record of software updates installed. The dealer will pull onboard data logs as well.
- Get results in writing. The dealer submits the diagnostic report to the manufacturer with your coverage verification. If the battery falls below the guaranteed capacity threshold, the manufacturer authorizes repair or replacement.
If Your Claim Is Denied
Don’t accept a verbal explanation. Request a written denial identifying the specific warranty exclusion the manufacturer is relying on and the evidence supporting it. If the denial cites an aftermarket part or modification, the Magnuson-Moss standard applies: the manufacturer has to show that specific part caused the failure.3Office of the Law Revision Counsel. 15 USC 2302 – Rules Governing Contents of Warranties
If you exhaust the manufacturer’s internal complaint process and still think the denial is wrong, options include filing a complaint with the FTC, pursuing arbitration (many warranty agreements include arbitration clauses), or consulting a consumer protection attorney. An independent technical report from a qualified EV technician can supply the evidence needed to challenge the manufacturer’s diagnostic findings.
Coverage When You Sell the Car
Battery warranties follow the vehicle identification number, not the original buyer. When you sell a used EV, the remaining warranty transfers to the next owner automatically in most cases. Hyundai’s warranty provides the full 10-year/100,000-mile coverage to subsequent owners with no registration or transfer fee.2Hyundai. Hyundai Warranty Coverage – America’s Best General Motors similarly transfers battery coverage at no cost within the original period.
If you’re buying used, check the original in-service date and the current odometer to calculate how much coverage is left. Any authorized dealer can verify this with the VIN.
Lemon Law Protection for Repeat Failures
If your battery keeps failing despite repeated warranty repairs, state lemon laws may open a path to a buyback or replacement vehicle. Lemon laws apply to EVs the same way they apply to gasoline vehicles. The battery is treated as a core component, equivalent to an engine or transmission.
Specific triggers vary by state, but the general framework looks similar: the manufacturer gets a reasonable number of repair attempts, often 3 or 4 for the same defect, and if the problem continues, or if the vehicle has been out of service for an extended period (commonly 30 or more cumulative days) for warranty repairs, you may qualify for relief. That relief typically means the manufacturer must repurchase or replace the vehicle.
These claims are strongest when you’ve documented every repair visit, kept copies of repair orders, and can show the same battery-related complaint recurring. If you’re approaching a third or fourth visit for the same issue, start keeping meticulous records and consider consulting an attorney who handles lemon law cases. Many take these on contingency, and most state lemon laws require the manufacturer to pay attorney fees if you prevail.