Every EV maker promises 8 years. The fine print is where they stop agreeing
Almost every electric vehicle sold in the U.S. carries some version of the same headline number: an 8-year battery warranty. That surface-level agreement hides a real gap in what actually happens when your battery degrades rather than outright fails. According to Tesla’s own vehicle warranty page, every Tesla model is covered for 8 years with a defined mileage cap and a specific, numeric floor: the battery is guaranteed to retain a minimum of 70% of its original capacity for the full term. That single number is the entire ballgame, and not every automaker publishes one.
Who actually names a number
Tesla’s terms break down by model on that same warranty page: Model S, Model X, and Cybertruck get 8 years or 150,000 miles with the 70% floor; Model 3 RWD and Model Y RWD/AWD get 8 years or 100,000 miles at the same 70% floor; the higher-output Model 3 Premium and Model Y Premium/Performance variants get 8 years or 120,000 miles, still at 70%. Ford matches that specificity almost exactly. Ford’s Mustang Mach-E warranty page states an 8-year/100,000-mile high-voltage battery warranty with a guaranteed minimum of 70% original capacity, applied uniformly across the Select, Premium, GT, and Rally trims. In both cases, the automaker is telling you in writing exactly how far the battery can fade before you have a contractual claim, not just a customer-service conversation.
Who names the years and miles but not the threshold
Chevrolet’s own Bolt EV product page advertises “8-yr./100,000-mi.* battery limited warranty” directly to shoppers, but nowhere on that page does Chevrolet commit to a specific capacity percentage the way Tesla and Ford do. Rivian’s structure is similarly silent on a number. Rivian’s own battery warranty article lays out a tiered system by pack size and model year — Dual Standard packs at 8 years/120,000 miles, Dual Large and Max packs at 8 years/150,000 miles, and the Quad Large pack on 2022-2024 R1 trucks stretching to 8 years/175,000 miles — but the article never states a minimum retained-capacity figure. That’s not necessarily a worse warranty on paper; both GM and Rivian still cover the pack against defects for the full term. But it does mean an owner watching their range slowly shrink has a much fuzzier standard to point to when arguing the battery needs replacing under warranty, compared with a Tesla or Ford owner who can cite an exact percentage from the manufacturer’s own published terms.
Why the missing number matters more than the years
Years and miles only tell you when coverage ends, not what triggers a claim while you’re still inside it. Battery degradation is a slow, largely invisible process; most owners won’t have a pack failure outright, they’ll have a pack that charges to less range than it used to. Without a stated percentage, a warranty claim over gradual capacity loss becomes a negotiation, decided case by case, dealer by dealer. With a stated percentage, it becomes a simple test: request a battery health check, compare the reading to the number on the warranty page, and the automaker’s own published terms tell you whether you have a claim. That’s the actual, practical difference between “we cover the battery” and “we cover the battery to 70%, in writing.”
What this actually means when you’re comparing two used EVs
Say you’re cross-shopping a used Mach-E against a used Bolt EV, both at similar age and mileage, both still inside their 8-year windows. On the Mach-E, you can request a battery state-of-health report, and if it reads below 70%, Ford’s own published terms say you have a warranty claim, full stop. On the Bolt, that same low reading doesn’t map to any number GM has put in writing on its consumer-facing page, so the outcome depends more on the specific service advisor, the specific dealer, and how the claim gets documented. Neither car is necessarily going to fail faster or slower — degradation rates depend far more on battery chemistry, climate, and charging habits than on which company wrote the warranty. But your leverage if something does go wrong is not equal, and that’s a genuinely useful thing to know before you sign.
The pattern across the fine print
Tesla and Ford chose to write a specific number into their own published terms; Chevrolet and Rivian chose to publish the years and miles and stop there. Neither approach is illegal or even unusual in warranty law, which generally only requires covering material defects, not guaranteeing a performance curve. GM and Rivian’s silence on a specific percentage isn’t necessarily a sign of weaker coverage, but it is a sign that not every “8-year battery warranty” is the same promise once you read past the headline number, and the gap only shows up if you go looking for it in each automaker’s own contract language rather than the marketing copy above it.