How Long Do EV Batteries Last? What the Real Data Shows

An EV battery typically lasts the life of the car, and in most cases well past the warranty. The largest independent fleet study, Geotab’s analysis of more than 22,700 vehicles, found batteries lose about 2.3 per cent of their capacity a year, which leaves around 82 per cent after eight years. Tesla reports its Model 3 and Model Y packs keep about 85 per cent on average after 200,000 miles, roughly 320,000 km. Heat and heavy fast charging speed wear up a little; normal home charging barely registers.

What does the real-world data say?

Three big datasets point the same way.

Geotab, a fleet telematics company, analysed more than 22,700 vehicles across 21 models. The average loss was 2.3 per cent a year, which projects to 81.6 per cent state of health after eight years. That’s slightly worse than the 1.8 per cent in Geotab’s 2023 analysis, which it puts down partly to newer cars using higher-powered charging. These are fleet cars, often worked harder than a family car.

Tesla has been selling EVs for well over a decade, and its 2023 Impact Report says that “even after 200,000 miles of usage, our batteries in Model 3 and Model Y lose just 15% of their capacity on average, while batteries in Model S and Model X lose just 12% of their capacity on average”. Tesla estimates a US car is scrapped at about 200,000 miles, so on its numbers the battery outlasts the car.

Recurrent, which tracks battery data from owners’ cars, looked at replacements across more than 30,000 EVs. Outside two big manufacturer recalls, fewer than 4 per cent have had a new battery, and that includes cars more than ten years old. First-generation EVs sit at around 8.5 per cent, second-generation cars like the early Model 3 at 2 per cent, and 2022-and-later cars at 0.3 per cent.

The shape of the curve matters too. Loss is usually quicker in the first year or two, then flattens out. Our battery health guide covers what a normal state-of-health result looks like at each age.

What does the warranty guarantee?

Almost every EV sold here has a separate battery warranty with a capacity floor. If the pack falls below that floor inside the period, the maker repairs or replaces it. We checked the current Australian terms:

Set against the data, 70 per cent is a conservative line. The average car in Geotab’s study would be sitting above 80 per cent when the warranty runs out. That’s why warranty replacements are rare, and why a replacement bill is unlikely for most owners; our battery replacement cost guide has the numbers for the unlucky few.

What makes a battery wear faster?

Three things, and Australia is good at one of them.

Heat. Geotab’s “hot climate” group was cars that saw more than 35 per cent of days above 25°C, and they lost 0.4 per cent more capacity a year than cars in mild climates. A lot of Australia fits that description, Queensland and the north especially. It’s a moderate effect, not a disaster: over eight years it’s roughly three extra points of capacity. Tesla’s manual asks owners to avoid leaving the car in ambient temperatures above 60°C for more than 24 hours, and BYD’s handbook says not to use charging equipment above 50°C ambient. Parking in the shade or a garage on hot days helps, and Tesla also recommends leaving the car plugged in when it isn’t being used.

Frequent high-power fast charging. This was the biggest single factor in Geotab’s data. Vehicles doing lots of charging, much of it above 100 kW, lost 3.0 per cent a year. Vehicles that rarely fast charged lost 1.5 per cent, which projects to 88 per cent after eight years. Tesla’s own battery care advice is to charge at home or on AC where possible and “save the Supercharging for road trips”. A driver who charges at home and fast charges on holidays isn’t in the heavy group.

Sitting full or empty for long periods. The old rule is to stay between 20 and 80 per cent. Geotab found degradation only really sped up when cars spent more than 80 per cent of their time near full or near empty, so a full charge before a trip does no harm. What to avoid is leaving the car parked at 100 per cent or near zero for weeks. BYD’s handbook recommends 40 to 60 per cent if the car will sit for more than seven days, and Tesla recommends about 50 per cent for long storage.

Do LFP and NMC batteries need different charging?

Yes, and it trips people up. Most EVs use one of two lithium-ion chemistries. NMC (nickel manganese cobalt) packs hold more energy for their weight and prefer not to sit full. LFP (lithium iron phosphate) packs, including BYD’s Blade battery and the pack in the Australian Tesla Model 3 RWD, handle full charges well.

The makers’ advice differs accordingly. BYD’s Australian warranty and service handbook recommends a full charge “at least once a week”, plus a full AC charge from below 10 per cent every three to six months “to aid range estimation calculations”. LFP packs have a flat voltage curve, so the car needs a full charge now and then to work out its true state of charge. Tesla’s current manual doesn’t name chemistries: it tells owners to follow the daily and trip limits shown on the car’s charging screen, and for cars with a recommended daily limit of 80 per cent, to keep it around 80 and save 100 for long drives.

The simple rule: do what your car’s screen or manual says. If it recommends 100, charge to 100. If it recommends 80, charge to 80 day to day and go to 100 before a trip. Our guide to how long charging takes explains why that last 20 per cent is slower anyway.

What does “end of life” actually mean?

It doesn’t mean dead. When people talk about a car battery’s end of life, they usually mean 70 to 80 per cent capacity, the point where range starts to annoy the owner. The car still drives normally; it just goes less far between charges. A pack that did 400 km new does roughly 300 km at 75 per cent, which covers most people’s week. Our guide to how far an EV can go covers the everyday things that change range more than a few points of battery health.

After that, a pack can have a second life. ARENA helped fund Melbourne company Relectrify to build 120 kWh commercial storage units from batteries retired from Nissan Leafs, once their capacity had dropped below roughly 80 per cent. Stationary storage asks far less of a battery than a car does. After that comes recycling.

So how long will yours last?

For a car bought new today, the evidence says the battery will very likely outlast the warranty and, for most owners, the time they keep the car. You’ll probably notice a few per cent of range loss in the first couple of years and very little after. If you’re buying used, a state-of-health test tells you where a particular car sits, and our used EV buying guide explains what else to check before you pay.