What wears out an EV battery?
Three things wear an EV battery faster than normal: frequent fast charging, hard, high-current driving and heat. Fleet data from more than 22,700 EVs shows cars that rely on fast chargers above 100 kW lose up to 3% of capacity a year, about double the rate of cars charged mostly at home. A new study adds driving style: its model predicts the most battery-stressing driving could cause about 2.5 times the long-term capacity loss of smooth driving. Even so, most batteries outlast the time people keep their cars, and the habits that protect them are easy.
What wears 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.
| What wears a battery | What the data says | How much it matters | What to do | Source |
|---|---|---|---|---|
| Frequent fast charging above 100 kW | Up to 3.0% capacity lost a year, against about 1.5% for cars that mostly charge on AC or low-power chargers | Biggest everyday factor | Charge at home; keep fast chargers for trips | Geotab, 22,700+ fleet EVs |
| Hard, high-current driving | A model predicts about 2.5 times the capacity loss over 1,000 charge cycles (53% vs 21%) | Real, but an estimate | Drive smoothly, especially in stop-start traffic | Scientific Reports, 15 EVs |
| Hot climate | About 0.4% a year faster than in mild climates | Small but steady | Park in shade or a garage; precondition on hot days | Geotab |
| Heavy use | About 0.8% a year more for the highest-use group | Small | Nothing to change: it's the cost of using the car | Geotab |
| Sitting very full or nearly empty | No meaningful extra wear unless it's most of the time (over 80% of the time) | Only if it's a habit | Don't leave it at 100% or near 0% for days (LFP: follow the manual) | Geotab |
The driving-style study: what it found
In August 2026, researchers at Shanghai Dianji University published a study in Scientific Reports looking at 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 actually 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.
Fast charging: still 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):
| Charging pattern | Loss a year | Range after 8 years |
|---|---|---|
| Mostly home (AC) charging | 1.5% | 424 km |
| Fleet average | 2.3% | 393 km |
| Heavy fast charging | 3.0% | 366 km |
Either way the car stays useful, and a battery losing range doesn't cost more per kilometre to charge.
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 look after your battery
- 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. On a road trip, fast charging is exactly what it's for.
- 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.
- Keep the software up to date. Battery management often improves with updates.
Is your battery covered?
Most EVs sold in Australia have a battery warranty of 8 years or 160,000 km, usually promising at least 70% of the original capacity. Normal slow fading isn't a warranty claim; a fault or a sudden drop is. More in how long EV batteries last. Buying used? Ask for a battery health report and take our used EV checklist.
Sources
- 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)
- Geotab: EV battery health and fast charging (13 Jan 2026)
- Motoring Research: regular rapid charging and battery decline (Jan 2026)
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Common questions
Does aggressive driving damage an EV battery?
It can wear it faster. A 2026 study in Scientific Reports estimated the most battery-stressing driving puts 18.4 times the short-term ageing stress on a battery and, in a model, about 2.5 times the capacity loss over 1,000 charge cycles. Those are projections from 15 cars, not measured results, but smooth driving is an easy habit.
Is fast charging bad for my EV battery?
Occasional fast charging is fine. Fleet data from more than 22,700 EVs found cars relying heavily on chargers above 100 kW lost up to 3% of capacity a year, about double cars charged mostly at home. Charge at home day to day and use fast chargers for trips.
Does highway driving wear the battery more than city driving?
Not necessarily. Steady highway cruising draws a fairly even current. In the 2026 study, the most battery-stressing driving had average speeds close to eco driving and was linked to repeated hard pulls in congested traffic and climbing with heavy loads.
Does hot weather affect EV batteries?
A little. Geotab found EVs in hotter regions lost about 0.4% more capacity a year than in mild climates. Parking in shade or a garage helps.
How much range will I lose over the years?
Typically 1.5–3% of capacity a year, depending mostly on how often you fast charge. For a car with 482 km of range, that's roughly 366–424 km after eight years.
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How we work it out, and our sources
Weekly cost = the car's energy use × 250 km × your electricity or fuel price, with 90% of charging at home. Prices are list prices at October 2026; check with the dealer.
- Electricity: 2026–27 default rates (AER, Victorian Default Offer, state retailers). Public charging: Sydney network prices, July 2026.
- Petrol and diesel: ACCC capital-city averages, 21 October 2026.
- Cars: maker figures via CarExpert, Drive, CarsGuide and EV Central. Plug-in electric range is taken as 80% of the claim.
- Servicing: published capped prices; marked as an estimate where not yet published (CarExpert comparison).
- Tyres: an EV set lasts about 35,000 km, a petrol or hybrid set 50,000 km (RACV); prices from Gridly.
- Home charger: about $2,000 installed ($1,000–$3,000). Novated leases: PwC summary.
Printed from EV Pick · evpick.com.au. Prices and costs are estimates; check with the dealer. © 2026 EV Pick (T. Crouch). For personal use only; not to be copied, republished or sold without permission.