That EV Battery Study Everyone’s Citing? Yeah, You Totally Misread It

Battery boffins have cautioned electric car drivers not to damage their batteries as a result of misunderstanding a recent study

                                        https://www.carscoops.com/author/chris-chilton-cc/                                    

A new piece of research has sparked lively debate about how best to treat an EV battery, especially for those hoping to maximize its lifespan. With replacement costs still high, it’s no surprise that owners want clear answers on whether gentle driving or spirited use is better for long-term health.

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EV batteries are still hugely expensive to replace, even if prices have fallen, so it’s only natural that anyone in for the ownership long-haul would want to look after theirs by driving and charging carefully. But a recent study published in the scientific journal Nature led some to believe that getting stuck into the right pedal on a regular basis and enjoying an EV’s performance could extend battery life.

The study, ‘Dynamic cycling enhances battery lifetime,’ compared the kind of discharge profiles achieved by a constant-current cycle in lab conditions with dynamic charging and discharging profiles from real-world EV use. It found that batteries subjected to the supposedly more gentle constant-current tests aged more rapidly than the more realistic ones.

Interpreting the Science

But before you head off to absolutely beast your EV down the highway, feeling like you’ve just been told a daily diet of Big Macs and beer will ensure you live to 120, it’s worth hearing what the battery diagnostic specialists from Aviloo have to say on the matter.

Aviloo’s own field tests of 402 identical EVs found that driving enthusiastically was a sure-fire way to shorten a battery’s lifespan, Auto Motor und Sport reports. The reason is that driving hard increases energy consumption and that means more charging cycles, more battery stresses and accelerated aging.

“If you drive efficiently, you save around ten percent of energy in the life cycle,” Aviloo’s Nikolaus Mayerhofer told AMS. “This means that 100,000 km (62,000 miles) with economical driving roughly corresponds to the battery load of 110,000 km (68,000 miles) with an aggressive driving style.”

Practical Advice for Owners

Aviloo isn’t suggesting the authors of the dynamic charging study got it wrong, only that other people misinterpreted their results. Its advice for anyone looking to maximize their EV’s battery life is unchanged: drive efficiently, and unless really necessary don’t fast-charge, charge over 80 percent or leave a car with a ton of juice in it for long periods.

But if that all sounds like too much work or just plain boring, all is not lost. In a recent German study a VW ID.3 lost only 8 miles (13 km) of range after four years and 107,000 miles (172,000 km), despite almost always being charged to full and often being left parked up fully charged.