It's one of the top questions I get about EVs: "How long will the battery last?" Understandably, people want to know that their car will go the distance before dropping tens of thousands of dollars on a new car with new-to-them technology.
A growing body of research shows that modern electric cars hold up just fine over years of normal use. And a huge study of Ford Mustang Mach-E SUVs further proves the point.
The Detroit automaker collected battery-health data from 36,000 Mach-E SUVs from the 2021 model year that were sold in the U.S. and Canada. The results, released Monday, should help quiet fears that EVs degrade like smartphones, which struggle to hold a charge after a few years of daily use.
On average, the cars had traveled 55,000 miles over 5.2 years and retained 92% of their usable battery capacity. That means a top-trim 2021 Mustang Mach-E with 305 miles of EPA range would in theory be rated for around 280 miles today. All the cars in the study have nickel-cobalt-manganese (NCM) battery packs, since Ford didn't introduce a lithium-iron-phosphate (LFP) battery for the Mach-E starting until the 2023 model year.
Ford physically tests cells in the lab and tries to predict battery degradation using computer models before a model launches, Kevin Vander Lann, the automaker's technical leader of high-voltage battery cells and systems, told me in an interview. But the real test comes after a car spends years on the road.
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