How long do EV batteries last?

What "lasting" means for a traction battery

An EV battery almost never dies the way a phone battery does. It fades. Each year it holds a little less energy, so the car goes a little less far on a full charge. The industry talks about this as state of health, or SoH: the usable capacity today as a percentage of the usable capacity when the car was new. A car at 90 percent SoH that started with 300 miles of EPA range now gets about 270 in the same conditions.

There are two separate aging processes at work, and the distinction matters because you can only control one of them.

• Calendar aging happens whether you drive or not. Lithium slowly gets locked up in a film on the graphite anode (the solid electrolyte interphase, or SEI), and that film grows fastest when the cell is hot and sitting at a high state of charge. A car parked at 100 percent in a Phoenix driveway ages faster than one parked at 50 percent in a Seattle garage, with zero miles driven in either case.
• Cycle aging comes from use. Every charge and discharge expands and contracts the electrode materials a tiny amount. Deep cycles (0 to 100) stress the cells more than shallow ones (40 to 80), and very high charging rates at low temperature can plate metallic lithium onto the anode, which is permanent.

Calendar aging dominates for most private cars, because most private cars sit parked more than 90 percent of the time. That is why degradation tends to track years more closely than miles, and why two cars of the same age with wildly different odometers often show similar SoH.

The curve is also not a straight line. Most packs lose a noticeable chunk, often 3 to 5 percent, in the first 12 to 18 months as the SEI layer forms, then settle into a slow linear decline of 1 to 2 percent a year. Owners who panic about a 4 percent drop in year one and then see almost nothing in year two are seeing the normal shape of the curve, not a defect.

What the fleet data says

The question "how much degradation is normal" now has real answers from large datasets, not just forum anecdotes.

Two things stand out. First, the average is low: at 2 percent a year, a pack is still above 80 percent after a decade, which is better than almost any warranty threshold. Second, the spread is wide. The Geotab data puts heavy DC fast charging users at twice the degradation rate of gentle chargers, and hot climates add a steady penalty. The same report also noted that the average crept back up from 1.8 to 2.3 percent between its 2024 and 2025 editions, which it attributes to more public fast charging as networks expanded.

Independent range tests back this up. A 2022 Tesla Model Y tested by Bjorn Nyland at just under 100,000 miles showed about 11.5 percent loss, which he flagged as unusually high: Teslas of that age and mileage usually land between 5 and 7 percent. Model 3 owners posting 100,000-mile range tests on the forums typically report 8 to 12 percent, with the early 2018 cars at the higher end.

What owners reported in the last month

The owner threads from the past 30 days on r/electricvehicles and r/TeslaLounge show the same spread as the fleet studies, with a tail that is worse than the averages:

• A 2022 Model 3 Long Range at 83,000 miles, charged to 80 percent daily, is at 83 percent after four years (92 percent after year one). Replies from 2021 to 2023 Model Y owners cluster between 81 and 86 percent at 56,000 to 86,000 miles.
• A 2017 BMW i3 charged to 100 percent every day reports 92 percent at 180,000 miles and ten years. In the same thread a 2020 Kona is at 95 percent after 182,000 km.
• A 2013 Model S 85 is at 81 percent after about 222,000 miles.
• An Australian Model S passed 600,000 miles on its second pack, the first having been replaced at 413,000.
• A two-year-old ID.3 tested at 100.3 percent by an independent service while the car's own BMS said 98. Tools disagree by a point or two, which is normal.

The Tesla cluster is the one to notice. The 2021 Model 3 and Model Y have become the used-market worry of the moment, with an informal dataset of several hundred pack-failure reports pointing at that model year and a theory about a reformulated potting foam. Nothing is confirmed by Tesla, and most 2021 cars are fine, but model year is a real variable when you shop used, not just mileage and habits.

Which EVs degrade faster

If you only remember one thing from this section: active thermal management is the single biggest hardware factor. A liquid-cooled pack can keep its cells in the 20 to 35°C band where lithium chemistry is happiest. An air-cooled pack cannot.

Across the 1,189 EV versions in our index, 1,156 use liquid cooling and only 33 use air or passive cooling. Nearly all of the air-cooled versions are older Nissan Leafs, and the Leaf is the car that gave EV batteries their bad reputation: first-generation 24 kWh packs in hot states routinely lost 20 to 30 percent in five years, and a used Leaf with "8 bars" on its 12-bar health gauge is a well-known trap. Later Leafs are better but still lack liquid cooling, so a used 40 kWh or 62 kWh Leaf deserves a closer look at its SoH than almost any other used EV.

Chemistry is the second factor. Lithium iron phosphate (LFP) cells tolerate full charges and high cycle counts better than nickel-based NMC and NCA cells, at the cost of lower energy density. There are 229 LFP versions in our index, mostly standard-range Teslas, Ford Mustang Mach-E standard range, and many BYD, MG and newer Chinese-built models. If you plan to keep a car for 15 years and do not need the longest range, LFP is the lower-risk pack. The chemistry guide covers the trade-offs in more detail.

Other factors, in rough order of importance:

• Climate. Hot is worse than cold for long-term health. Cold hurts your range today but not the pack's lifespan, as long as you do not fast charge a frozen battery.
• Pack size. A bigger pack does the same trip at a lower depth of discharge and a lower relative charge rate, so it cycles more gently. The median usable capacity in our index is now 73 kWh, roughly double where the market was in 2018, which is part of why newer cars age better.
• Buffer. Automakers hide some capacity above and below what the dashboard shows. A generous top buffer (GM and Hyundai are known for this) means the cells never actually sit at a true 100 percent, which is good for longevity but means a "100 percent" charge is not quite what it says.
• Software. Battery management improves over the air. Several makers have tightened charge curves or changed balancing logic years after launch, which is one reason the fleet averages keep moving.

Model-level rankings get published every year, and Hyundai and Kia's 800-volt cars (Ioniq 5, EV6) and most Teslas tend to sit near the top, with several models holding 97 percent or better past 60,000 miles in used-car testing. Treat any single ranking cautiously: sample sizes per model are often small, and a model that is new to the market has only its gentle first years on record. Our EV battery index lists capacity, chemistry and cooling for every version so you can check what you are considering.

What the warranty actually covers

Every EV sold in the United States carries a traction battery warranty of at least 8 years or 100,000 miles, whichever comes first. That floor comes from federal emissions rules, which treat the battery as an emissions-control component. Plug-in hybrids get a slightly lower floor of 8 years or 80,000 miles.

The part people miss is what counts as a failure. A battery that still works but has lost range is only covered if it drops below a capacity threshold written into the warranty, and that threshold is usually 70 percent. Some are lower: GM's Ultium-era cars (Equinox EV, Blazer EV, Lyriq) carry an 8-year, 100,000-mile warranty but only guarantee 60 percent retention. A car at 72 percent after seven years is working as designed in the eyes of the manufacturer, even though it has lost more than a quarter of its range.

The warranty landscape is changing for the better. California's Advanced Clean Cars II rules require EVs from the 2026 model year onward to retain at least 70 percent of their range for 10 years or 150,000 miles, rising to 80 percent for 2030 models. The dozen or so states that follow California's vehicle rules (New York, New Jersey, Massachusetts, Oregon, Colorado, Washington and others) adopt the same terms. If you are shopping in one of those states, a 2026 car gets a materially longer and stricter battery guarantee than a 2025 car of the same model.

Warranties also typically transfer to the second owner, which is why a three-year-old EV with five years of battery coverage left is often a better buy than the same car at six years old. Read the booklet for exclusions: most void coverage for packs that have been opened, modified, or used in a car that was salvaged or flood-damaged, and some require periodic software updates.

What a replacement actually costs

This is the number that scares people out of used EVs, so it is worth separating the invoice from the probability. Recurrent's tracking of more than 20,000 cars found only about 2.5 percent ever needed a battery replacement outside of a recall, and most of those were older Leafs and early Model S cars. Full-pack failures on a modern liquid-cooled car are rare enough that most owners will sell the car long before they would ever see one.

When a replacement does happen, the price depends on three things: the size of the pack, whether you go through the dealer or an independent shop, and whether you need a whole pack or just a module.

A few practical points from owners who have been through it. Ask about a remanufactured pack: Tesla routinely installs reman packs under warranty and will sell one out of warranty for roughly half the price of new. If the failure is days or weeks past the warranty date, ask for a goodwill repair before accepting the quote; owners report that dealers sometimes split the cost, and that a used pack from a salvage car runs $9,000 to $10,000 for a 100 kWh Model S. A replacement pack installed under warranty does not restart the clock: it is covered to the original 8-year or mileage date, as one owner on his third pack found out. Dealers almost always quote a complete new pack, because that is the procedure the manufacturer supports. Independent EV specialists can often diagnose a single weak module or a failed contactor, and fix that for a fraction of the price. Out-of-warranty battery problems are also often not the cells at all: a failed high-voltage contactor, a coolant leak, a pyrotechnic fuse or a battery management board fault can all throw the same dashboard warning and cost a few hundred to a couple of thousand dollars to repair.

Also check for a recall before paying for anything. Our index tracks 171 NHTSA battery recall campaigns, including the Bolt, Kona, Taycan and several Mercedes and Jaguar programs where whole packs or modules were replaced free of charge regardless of mileage. New ones keep coming: in October 2026 Volkswagen recalled about 22,500 ID.4s for a cell defect and told owners to charge to no more than 80 percent until the fix is ready. The recall pages are organized by make.

How to check battery health on a used EV

Forum threads about buying used almost always end with the same advice: do not trust the odometer, trust the SoH. Here is how to get it, from easiest to most thorough.

1. Look at the dashboard at 100 percent. Ask the seller to charge the car fully (or near full on a non-LFP car) and compare the displayed range to the EPA rating for that trim and year. A 2021 car showing 280 miles against a 310-mile rating is at roughly 90 percent, which is normal. This is crude because the displayed range also reflects recent driving, but it catches the bad cases.
2. Use the car's own test. Teslas show an estimated battery health figure in the service menu, and offer a longer battery health test that takes about 24 hours plugged in. Several other brands show a SoH or "battery capacity" figure in the owner app. Ask the seller to open it in front of you.
3. Read the BMS with an OBD app. A $20 to $40 Bluetooth OBD-II adapter plus a model-specific app (LeafSpy for Nissan, Scan My Tesla or TesLAX for Tesla, Car Scanner or EVNotify for Hyundai and Kia, Torque Pro with the right PIDs for GM) reads the capacity the battery management system itself has calculated. Treat it as an estimate, not a verdict: the BMS figure drifts with recent driving, different apps and services disagree by a point or two, and most manufacturers decide a warranty claim with their own capacity test (typically two full discharge cycles at a set rate at the dealer) rather than the in-car number. Do it with the seller's permission; on Teslas the adapter plugs into a connector behind the center console rather than a standard port.
4. Get a dealer or third-party report. Franchised dealers can print a battery health report, usually for $100 to $200. Services like Recurrent produce a report from the car's telematics without a visit, and some used-EV retailers include one with every listing.
5. Check the history, including the model year. A car that lived its life in Arizona or Texas, or that was used for ride-share with daily fast charging, deserves more scrutiny than a garaged commuter in Vermont. Model-year pack issues are real too (early Leafs, 2017 to 2019 Bolts before the recall, and the current cloud over 2021 Model 3 and Y packs), so search the owner forums for the exact year before you buy.

Benchmarks to judge the result against, for a liquid-cooled car:

• Under 2 years: 95 percent or better is typical.
• 3 to 4 years: 90 to 95 percent.
• 5 to 6 years: 88 to 93 percent.
• 8 years: 85 to 90 percent; below 80 is worth a serious discount or a walk away, unless there is warranty left to fall back on.

Air-cooled Leafs run 5 to 15 points below those numbers at the same age, and some early ones are far worse.

What you can do about it

You cannot stop calendar aging, but the fleet data is clear that habits move the rate by a factor of two. Ranked by impact:

1. Do not park at 100 percent. For NMC and NCA packs, set the daily charge limit to 80 percent (or whatever the manual recommends) and charge to full only right before a trip. LFP packs can and should be charged to 100 regularly; the chemistry does not mind and the battery management needs it for calibration.
2. Do not park near empty either. Sitting below 10 percent for days is the mirror image of sitting at 100. Plug in when you get home.
3. Prefer AC charging when you have it. Fast charging is fine on road trips. Making it your only charging method is what the Geotab data flags as the biggest stressor, especially at over 100 kW. Preconditioning the pack before a fast charge helps because it keeps the cells in their safe temperature window.
4. Keep it cool. Shade and garages matter more than most people think. Leaving the car plugged in during a heat wave lets the thermal system run from the wall instead of the pack.
5. Avoid long storage at the extremes. Leaving for a month? Park it at 50 to 60 percent, plugged in if the manual says so.

The charging questions guide goes through each of these in detail, including the 80 versus 100 debate and what to do in winter.

When to actually worry

Gradual fade is normal. These are not:

• A sudden drop of 10 percent or more in displayed range over a few weeks. That is more often a BMS recalibration than real loss (a full charge and a long drive usually resets it), but if it persists, get the cell voltages read. On GM cars in particular the range display is a trip-based guess that a day of dealer idling with the air conditioning on can tank, as a Bolt owner found after a service visit; it says nothing about capacity.
• Two to four percent lost per day while parked. That is almost never the main pack. A failing 12V battery keeps the car's computers cycling and drains the pack through the DC-DC converter, and some Hyundai and Kia models stop topping up a weak 12V after repeated attempts. Replace the 12V first.
• Range that collapses on hills or in cold while the display still shows plenty left, or a car that shuts down with 15 percent showing. This points to a weak cell group dragging the pack down, which is a warranty claim.
• Battery warnings, reduced power messages, or charging that stops early repeatedly. Contactors, coolant sensors and isolation faults are the usual causes and are fixable.
• An open recall. Check the recall list or the NHTSA site by VIN. Several campaigns limit charging to 80 or 90 percent until the fix is done, which temporarily looks like degradation.

An EV battery is the most expensive single component on the car and also the most over-worried-about. The replacement rate is in the low single digits, the warranties are long and getting longer, and the data from tens of thousands of cars says a well-treated modern pack will outlast most owners' interest in the car. Check the SoH, buy the liquid-cooled car, charge to 80, and stop thinking about it.