How Long Do EV Batteries Last?

For practical purposes, the battery will likely outlive the car. Most modern EV packs are engineered for 15 to 20 years or 200,000-plus miles of service, and large-fleet studies show they degrade slowly and predictably — not the sudden death many buyers imagine. The battery is the part people worry about most and need to worry about least.

The fear comes from experience with phone and laptop batteries, which noticeably fade in a few years. EV packs are a different animal: they are far larger, actively cooled, and managed by software that keeps each cell in its healthy zone. That is why an EV loses only a sliver of range per year while a phone visibly wilts. Degradation is quickest in the first year or two, then flattens out — so the early dip is normal and does not predict a steep decline.

Every EV sold in the U.S. comes with a battery warranty of at least 8 years or 100,000 miles, mandated by federal law. Most cover capacity too — guaranteeing the battery keeps at least 70% of its original capacity over the term, and repairing or replacing it if it falls short. A few brands go further on years or mileage.

The pattern is consistent: 8 years / 100,000 miles is the floor, Hyundai and Kia stretch to 10 years, and electric trucks like the Rivian R1T carry higher mileage coverage. The 70% capacity guarantee is the part buyers overlook — it means a manufacturer is on the hook if your range degrades faster than expected, which is exactly the scenario people fear. For how warranty terms factor into long-term value, see our should you buy an EV guide.

In practice, EVs lose roughly 1 to 2% of usable capacity per year. That means range slips slowly — a 300-mile EV might read around 270 miles after ten years — rather than failing suddenly. The slow, predictable fade is the single most important thing to understand about EV batteries.

A few habits meaningfully slow degradation: charging to about 80% for daily driving instead of 100%, avoiding leaving the car sitting at full or near-empty for long stretches, and parking out of extreme heat when possible. Heat and prolonged high states of charge are harder on a battery than mileage or fast charging. We dig into which of these factors actually move the needle — and which are overblown — in our companion analysis, EV battery life: what actually matters.

Out-of-warranty battery replacement is expensive — historically several thousand to over $15,000 — but it is rarely needed within a normal ownership period, because the pack is warrantied for 8 to 10 years and degrades slowly. For most owners it is a tail risk on an old car, not a budget line.

Two trends soften the worry. First, pack prices have fallen dramatically over the past decade as production has scaled, so a replacement today costs far less than it would have a few years ago. Second, repair is increasingly modular — a failed module or component can often be fixed without swapping the entire pack. If you are buying used, the practical move is to check how much battery warranty remains and, ideally, the battery's measured state of health, rather than assuming an expensive replacement is imminent.