Kia EV6 leads battery-health ranking in Swedish used-EV study, ahead of Tesla Model Y

The truth about EV battery life

Remember when people claimed electric cars wouldn’t last? It turns out that fear was misplaced. A new study found most EVs still hold about 90% of their battery capacity after years of driving.

In that dataset, the Kia EV6 showed the lowest measured degradation among EVs, suggesting modern packs can retain high capacity with proper management. This discovery might finally put old battery myths to rest.

Kia steals Tesla’s spotlight

Tesla is renowned for its technological innovations, but the Kia EV6 has shown impressive battery health retention. The EV6 ranked first for long-lasting battery health, outperforming the Tesla Model Y.

That means Kia drivers get a more reliable range over time. It’s a huge win that shows even newer automakers can lead in EV technology when they get the design and management systems right.

How the study was done

Researchers at Kvdbil in Sweden analyzed 1,366 used electric and plug-in hybrid cars to see how their batteries aged.

They didn’t rely on predictions or simulations; instead, they used real-world data from everyday cars. The results provided a clear insight into how well today’s EVs perform after years of regular driving and charging.

What state of health really means

“State of Health,” or SoH, measures the amount of usable capacity a battery retains compared to its original capacity when new.

A perfect battery scores 100%, and most EVs in the study maintained a charge of around 90% even after long-term use. That’s proof that modern batteries are far stronger and more efficient than skeptics ever expected.

Driving habits make a difference

How an EV is used matters more than how old it is. Vehicles that undergo frequent fast charging or aggressive driving tend to lose battery capacity faster.

In contrast, EVs driven smoothly and charged at moderate rates maintain their health for longer. Ultimately, battery life depends less on mileage and more on how wisely drivers manage charging and driving habits.

Kia’s smart engineering pays off

The EV6 topped KVD’s sample on measured battery health. KVD emphasizes that usage patterns, climate, and charging habits are key drivers of SoH; design/BMS may contribute, but the dataset does not isolate causality.

Those features prevent damage and slow down wear, which is why the EV6 has consistently outperformed its rivals over time. Kia clearly did its homework.

Tesla still ranks among the best

Tesla’s Model Y performed well, ranking among the top models in the study. That’s still impressive, showing that Tesla’s battery systems remain among the best in the industry.

In the study, the Model Y ranked near the top, suggesting that many Tesla owners in the sample maintained a strong range after years of use.

The top 10 battery champions

Kia, Audi, Opel, Tesla, and Mercedes ranked highest for battery health, followed closely by Peugeot, Volvo, BMW, Volkswagen, and Skoda.

These findings reveal that lasting battery performance isn’t just a luxury brand advantage. Electric vehicles from a wide range of prices and segments proved capable of maintaining strong battery life and long-term reliability over time.

Plug-in hybrids proved durable

In KVD’s PHEV list, models like the Kia Sportage and Volvo XC60 ranked highly on measured SoH in Sweden’s used market sample.

Since PHEVs generally undergo less intensive electric-only driving than full EVs, their batteries experience reduced stress during daily use. This lighter cycling helps preserve battery health and extend overall longevity.

Technology is getting smarter

Modern EV batteries last longer due to improved engineering. Advanced cooling systems, protective software, and better materials prevent overheating and overcharging, reducing strain on the battery.

These innovations help slow natural degradation, giving drivers more years of reliable range and peace of mind. With these enhancements, EV owners can enjoy longer-lasting battery performance and fewer concerns about capacity loss over time.

Simple habits extend battery life

Driving smoothly and avoiding constant fast charging can make a big difference. As a general rule for many modern EV chemistries, limiting regular charges to roughly 20–80% of the battery’s capacity can reduce stress. Owners should follow their vehicle manufacturer’s guidance, as battery chemistries differ.

Small changes in charging habits and driving style can help EV owners significantly extend the lifespan of their batteries far beyond early expectations.

Fast charging’s hidden downside

Frequent DC fast charging can contribute to additional degradation in some use cases, especially when operating at high temperatures; well-managed thermal/BMS strategies can mitigate these impacts. Experts suggest reserving fast charging for longer trips while relying on slower home charging for daily use.

This approach keeps the battery cooler, reduces strain, and helps maintain its health over time, ensuring more consistent performance and longer-lasting capacity for your EV.

Climate affects battery wear

Temperature has a major impact on battery longevity. Extreme heat or severe cold can put stress on battery cells, gradually reducing their capacity over time. EVs driven in moderate climates generally experience slower battery aging.

Today, many modern electric vehicles are equipped with advanced temperature control systems, which help protect the battery from harsh conditions and ensure more consistent performance and longer-lasting capacity, even in extreme weather environments.

Real mileage proves the point

Some analyses report many EVs near 90% SoH around 90,000 miles and 85% near 130,000 miles, but results vary by model, climate, and charging patterns.

That’s a solid performance record showing EVs can last hundreds of thousands of miles without needing a new battery anytime soon.

Recycling and costs improving

Even when an EV battery reaches the end of its life, it’s far from wasted. Underlying pack costs have declined in recent years, and DOE-backed projects, along with industry efforts (e.g., Redwood), are scaling second-life and recycling pathways that can improve economics over time.

Many old batteries are repurposed for home energy storage, giving them a second life. This not only extends the battery’s usefulness but also makes electric vehicles more sustainable, reducing their environmental impact and contributing to a circular approach in managing battery resources.

Curious about how long EV batteries really last and what replacement costs look like? Learn all the details in our full guide.

A new way to see EV longevity

This and other recent studies strongly counter the idea that EV batteries wear out quickly, showing that they often retain most of their capacity for many years. With better tech, smarter drivers, and stronger batteries, they’re built for the long haul.

If automakers share this truth more widely, more people might realize that electric cars can easily match, and often beat, gas cars in long-term value.

Want to see how Hyundai and Kia are leading in EV sales? Dive into the latest update.

Read More From This Brand:

• How to monitor battery health and range accuracy in EVs
• Hyundai pauses Georgia EV battery-plant construction after immigration raid
• How regenerative braking affects EV maintenance

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This slideshow was made with AI assistance and human editing.