Why the Latest 500,000-Vehicle Study Proves Used EV Packs are Perfect for Classic Conversions
If you've ever discussed electrifying a classic car at a pub or a car show, you've inevitably heard The Question: "But what about the battery life? Won't it just die in five years?"
It’s the most common piece of skepticism we encounter when talking to clients about our bespoke EV conversions. Whether we are discussing a rugged Land Rover Defender or a lightweight Citroën 2CV, people worry that utilizing second-hand high-voltage battery modules is a ticking time bomb.
Well, the data is officially in, and it's time to put those doubts to rest.
A massive recent study by battery diagnostics company Aviloo analyzed 500,000 real-world EV battery health tests, and the results are incredibly encouraging. The core takeaway? EV batteries degrade far, far slower than the skeptics want you to believe.
The Numbers Speak for Themselves
The study looked at 20 popular EV models at three different mileage milestones. By the time most of these vehicles hit the 150,000-kilometer mark (roughly 93,200 miles), the vast majority of them still retained between 90% and 94% of their original battery capacity.
Yes, you read that right. After nearly 100,000 miles of driving, rapid-charging, and daily use, these batteries had lost less than 10% of their usable range.
Even vehicles with smaller battery packs—like the Nissan Leaf and Renault Zoe—held up incredibly well. Because smaller batteries require more frequent charging cycles to cover the same distance, they do degrade slightly faster, yet even they retained around 86% to 87% capacity after 150,000 kilometres.
What This Means for Classic EV Conversions
At Cotswold Electroworks, we spend our days 3D scanning, designing custom battery enclosures, and integrating high-voltage systems to give classic cars a second life. When we pull a battery module from a donor vehicle, we aren't just salvaging parts; we are utilizing hardware that has barely stretched its legs.
Think about the maths for a moment. If an EV battery loses less than 10% of its capacity over 100,000 miles as a daily commuter, what happens when we integrate it into a classic Land Rover or a Series vehicle?
Classic cars are rarely used for grueling 20,000-mile-a-year commutes. Most converted classics are driven on weekends, for local errands, or for scenic summer trips, averaging maybe 2,000 to 4,000 miles annually.
If you drop a used donor battery with 90% health into a bespoke conversion that only covers 3,000 miles a year, that battery is effectively going to last a lifetime. In a low-mileage application, the degradation curve flattens out almost entirely, meaning you will have ample, reliable range for decades. Frankly, your classic's original steel chassis or bulkheads will likely need more welding and attention than your high-voltage battery pack ever will.
The Sustainable, Engineering-Led Choice
Our goal has always been to marry beautiful classic automotive design with reliable, modern electric drivetrains. This study proves that utilizing used EV batteries isn't just an environmentally sound choice—it’s an engineering no-brainer.
The next time someone tries to tell you that an EV-converted classic will need a completely new battery in a few years, you can confidently point them to the 500,000 real-world vehicles that prove them wrong.