EV battery life: How long it lasts and what wears it out

How much range do you lose?

Median battery health by age, from Generational's 2025 Battery Performance Index (UK data, more than 8,000 cars across 36 brands). That works out to roughly 1–1.5% a year.

In practice, a car with 510 km of claimed range when new would have roughly 459 km after eight years. That's rarely enough to change how you use it day to day.

Fleet data shows a faster average, 2.3% a year across more than 22,700 fleet EVs, because work vehicles fast charge far more than most private cars. How you charge is the biggest reason two cars of the same age differ.

What wears out an EV battery, ranked

Every lithium-ion battery slowly loses capacity, from use and from age. How fast depends mostly on how it's charged, how hard it's worked and how hot it gets.

Fast charging: the biggest factor

Telematics company Geotab looked at battery health in more than 22,700 fleet EVs across 21 makes and models (published January 2026). Average capacity loss was 2.3% a year, up from 1.8% in its 2024 findings, as fast charging has become more common. Cars that relied heavily on DC charging above 100 kW lost up to 3.0% a year; cars that mostly used AC or lower-power charging lost around 1.5%.

Geotab calls charging power the strongest operational influence on battery health, ahead of climate. Its advice: use the lowest charging power that still does the job.

What that means for range after eight years, for a BYD Sealion 7 Premium with 482 km of claimed range (a simple straight-line estimate):

Either way the car stays useful. Occasional fast charging on trips is exactly what fast chargers are for.

Does driving style matter?

In August 2026, researchers at Shanghai Dianji University published a study in Scientific Reports on how driving style affects battery ageing. They used a full year (2022) of real driving data from 15 electric cars in Guangzhou, China, recorded every 10 seconds, and sorted every minute of driving into five styles, from eco to the most battery-stressing.

• Current draw: the most stressful style pulled an average (RMS) current of 66.02 amps from the battery, about 3.2 times the eco style's 20.56 amps.
• Short-term stress: the researchers estimate it caused 18.4 times the short-term ageing stress of eco driving.
• Long-term loss: projected over 1,000 charge cycles, their model predicts 53.22% capacity loss for the most stressful style and 21.15% for eco driving, about 2.5 times as much.

Read the fine print. The capacity figures are model projections, not batteries measured after 1,000 cycles; the authors say none of their indicators is a directly measured battery health result. The sample is 15 cars in one hot city over one year, and the paper doesn't name the battery chemistry. The study didn't record road grade, vehicle load or traffic, so it can't fully separate rough driving from heavy loads or hills. And 1,000 full cycles is a long way: for a car with 400–500 km of range, that's very roughly 300,000–450,000 km of driving (our estimate).

"Aggressive" isn't just speed. The study defined the worst style by how much current it drew, not by speed. The most stressful driving had average speeds and acceleration close to eco driving; the authors link it to repeated hard pulls in congested traffic and climbing with heavy loads. Steady highway cruising draws a fairly even current and wasn't singled out as the problem.

Heat and Australian conditions

Geotab found cars in hotter regions lost about 0.4% more capacity a year than cars in mild climates. That matters in Queensland, WA, the NT and inland NSW, SA and Victoria. Most EVs cool their batteries, but you can help: park in shade or a garage in summer, avoid leaving the car sitting fully charged in the sun for days, and fast charge a hot battery only when you need to.

How to make your battery last

• Charge at home when you can. A power point or wall charger is the gentlest (and cheapest) way. See power point, wall charger or fast charger?
• Use fast chargers for trips, not every day, especially in hot weather.
• Drive smoothly. Ease away from lights and avoid repeated full-power launches, especially in stop-start traffic. Eco or comfort modes help.
• Mind heavy loads. Towing, a full car and steep climbs all draw high current. That's fine, just expect a bit more wear if it's your everyday use.
• Follow your car's charge limit advice. Many makers suggest about 80% for daily use; LFP batteries (common in BYD, MG and base Teslas) are often meant to go to 100% regularly.
• Don't leave it at 100% or near empty for days unless the manual says that's fine.
• Park in the shade or a garage in summer when you can.
• Keep the software up to date. Battery management often improves with updates.

Battery warranties in Australia

Most EVs sold here have a separate battery warranty of 8 years or 160,000 km, whichever comes first, and some brands offer more. The warranty usually promises the battery will keep at least 70% of its capacity, so normal slow fading isn't a claim; a faulty cell or a sudden drop is. Each car page lists the car's main warranty, and the brand's website has the battery terms.

Does battery wear change running costs?

Hardly at all. An older battery holds less energy, so you get fewer kilometres per full charge, but the car uses about the same energy per kilometre, so the cost per week to charge stays close to new. Losing 10% of range after eight years means charging a little more often, not paying more per kilometre.

Where battery age does matter is resale value: buyers pay less for an older EV with lower battery health or little warranty left. Our cost-to-own figures leave out resale value because it varies too much by brand and car to estimate fairly. If you plan to keep a car for 10 years or more, a longer battery warranty is worth weighing up when you compare cars.

Buying used, or facing a replacement

Ask for a battery health (state of health) report, which many dealers and EV specialists can produce, and check how much of the battery warranty is left and whether it transfers to you. A healthy battery at 90%+ is normal for a car a few years old. Our free battery health check shows whether a figure is normal for the car's age, and how to check a used EV's battery covers independent tests and dealer reports. Take our used EV checklist to the inspection.

Full replacements outside warranty are uncommon. Faults are often fixed by replacing a single module rather than the whole pack, and battery prices keep falling. See what a replacement battery costs. When a battery does reach the end of its life in a car, it can be reused for home storage or recycled.

Sources

• Generational: 2025 Battery Performance Index (UK, more than 8,000 EVs)
• Geotab: EV battery health and fast charging (13 Jan 2026)
• Cheng, Gu and Gao: Physics-aligned causal inference of driving styles on electric vehicles battery aging, Scientific Reports (14 Aug 2026)
• ScienceAlert: driving style and battery wear (Aug 2026)
• Interesting Engineering: aggressive driving and battery capacity (Aug 2026)
• Motoring Research: regular rapid charging and battery decline (Jan 2026)

Best car lists

See every list ›