If you’ve been scrolling through car forums lately, you’ll know the biggest fear for prospective buyers is the 'ticking time bomb' of a dead battery. But here's the thing—is that fear actually based on reality? New data suggests we’ve been worrying over nothing. A massive UK study of 8,000 vehicles just revealed that average used EV battery health is sitting at a remarkably high 95.2 per cent.
It turns out these batteries are tougher than we gave them credit for. In fact, most are on track to outlive the actual chassis of the car. Even when we look at high-mileage heroes with over 100,000 miles on the clock, they’re frequently holding onto 85 to 95 per cent of their original capacity. Honestly, the days of the 'bricked' battery are quickly becoming a myth of the past.
How long do EV batteries really last?
I’ve seen plenty of drivers panic as their car hits its eighth birthday, but the numbers tell a different story. For EVs aged between 8 and 9 years, the median State of Health (SoH) is still 85 per cent. That’s a huge win when you consider most manufacturer warranties only kick in if the health drops below 70 per cent. We’re seeing cars from as far back as 2013 that are still going strong, comfortably beating those warranty safety nets.
Does mileage actually matter?
You might assume a car with high mileage is a risky bet; however, the report found that age and charging habits actually matter more than the odometer. Interestingly, younger cars that have been driven hard often have better-used EV battery health than older ones that have just sat on a driveway. It seems batteries, much like us, prefer to keep moving rather than sitting idle.
Transparency and the 'battery passport'
To clear up the confusion, the UK and EU are introducing a mandatory battery passport system by February 2027. This digital record will track everything from mineral origins to real-time health. Volvo and Kia are already leading the charge here. It means you won't have to guess about the most expensive part of the car anymore; the data will be right there in black and white.
Ultimately, the conversation is changing. We're moving away from asking if the battery will fail and starting to look at how well it was looked after. With health scores staying this high, the secondhand electric market is looking like a much safer place to put your money.