How long does an EV battery last? Won't it be worn out in a few years?

“A phone battery fades in two or three years, so surely the huge battery in an EV is finished in a few more.” That worry is one of the main reasons people hesitate over an EV: if an expensive battery degrades quickly, replacing it will cost a fortune and the resale value will collapse. Now that data from tens of thousands of cars has accumulated, though, the worry turns out to be far from what actually happens.

The short answer: (1) real-world degradation runs at a mild 1.8–2.3% a year, (2) after eight years a battery still holds more than 80% of its capacity, and treated well it should last 20 years or more, and (3) manufacturers back the battery with warranties of typically eight years or 160,000 km — so batteries dying within a few years is something that essentially does not happen. Let’s take those in turn.

A phone battery and an EV battery are different animals

Start with where the misunderstanding comes from. A phone battery fades quickly because it goes through deep cycles every day — run down to almost nothing, charged back to 100% — with only rudimentary cooling.

An EV works differently at a basic level. Its lithium-ion battery sits under a battery management system (BMS) that governs temperature, voltage and charging speed in fine detail. Most EVs also keep a buffer outside the 0–100% the driver sees, so the cells are never actually run to the edges that damage them, and liquid cooling keeps heat in check. An EV battery, in other words, is designed to be looked after in a way a phone battery never is.

What real-world data shows: less degradation than expected

Now the measurements. Geotab, a large fleet-management company, analysed about 22,700 EVs across 21 models in 2025 and found capacity fading by an average of 2.3% a year — and only 1.8% on the newer vehicles from around 2023 [1]. Better technology and better thermal management are making newer cars degrade more slowly.

Compounded over time, that leaves the average battery at about 81.6% of its original capacity after eight years [1]. On an EV with 400 km of range, that still means over 320 km after eight years, which is not a level that gets in the way of everyday use. Analysts note that a modern EV battery should last 20 years or more, and that in some cases the battery will outlive the car around it [1]. The data rules out the idea that batteries stop working after a few years.

The one thing that clearly accelerates degradation is heavy use of high-power fast charging [1]. Charging slowly at home as the default, saving fast charging for long trips, and staying roughly between 20% and 80% rather than filling and emptying the pack will slow the fade further.

The manufacturer warranty as a safety net

Behind all this sits the warranty. Most manufacturers cover the traction battery for something like eight years or 160,000 km, and repair or replace it free of charge if capacity falls below a set level — generally 70% — within that period.

Read the other way round, that is manufacturers betting their own money that capacity rarely drops below 70% during the warranty. And so it proves: warranty battery replacements are rare, and outside a few early models, replacement remains an exceptional event. For a buyer, the warranty is the floor under the worst case.

Replacement cost and resale value: the fears that remain

The cost of a replacement, should it ever be needed, and the value of the car second-hand are worth being straight about. Replacing a pack is not cheap, but the cost keeps falling as cell prices fall: BloombergNEF puts pack prices about 90% below their 2010 level. Repairs are also shifting towards replacing only the degraded modules rather than the whole pack.

Resale values have suffered from a vague fear of degradation. But degradation is mild, as above, and state-of-health (SOH) diagnostics that put a number on a used battery are starting to spread. Once the condition of a battery is visible and objective, a well-kept used EV can be priced on its merits, and the worry about residual value should ease.

A second life for retired batteries

One more thing matters when talking about lifespan: a battery that has finished its time in a car is still a useful battery. With 70–80% of its capacity left, it can go on to a second life as stationary storage — a home or commercial battery, or a buffer that absorbs the swings of renewable generation.

When that life ends too, recycling recovers the metals and feeds them back into new cells. An EV battery is not rubbish after a few years; it is a resource that travels a long road, from the car to stationary storage to recovered material. Seen that way, the question of “lifespan” changes shape.

In short, the fear that an EV battery is spent within a few years is contradicted by data from tens of thousands of cars. Degradation runs at around 2% a year, more than 80% of capacity remains after eight years, and a long warranty sits underneath. Afterwards the battery is reused and then recycled. It is better understood as a long-lived asset than as a consumable.

Summary

Real-world data (Geotab 2025, about 22,700 vehicles) puts degradation at a mild 1.8–2.3% a year, and newer cars degrade more slowly.
Capacity is about 81.6% after eight years, with 20 years or more expected under reasonable use — sometimes outlasting the car.
Manufacturers typically warrant eight years or 160,000 km to 70% capacity. Replacement is exceptional.
What accelerates wear is heavy fast charging; charging slowly and staying between 20% and 80% keeps it down.
After the car, batteries go to second-life storage and then to recycling. They are a circulating resource, not a consumable.

“Worn out in a few years” is a memory of phone batteries. EV batteries last far longer, and far more stubbornly, than that.

References and data sources

[1]: Geotab. (2025). EV battery health: Key findings from 22,700 vehicle data analysis. https://www.geotab.com/blog/ev-battery-health/ / Electric Autonomy. (2026). Latest Geotab study finds EV batteries lose just 2.3% life per year. https://electricautonomy.ca/ev-supply-chain/batteries/2026-01-13/latest-geotab-study-finds-ev-batteries-lose-just-2-3-life-per-year/ (1.8–2.3% degradation per year, 81.6% after eight years, 20-plus years, fast charging as the main stressor)