The National Highway Traffic Safety Administration (NHTSA) said Monday that the agency is currently looking into Ford’s 2022 recall of 49,000 Mustang Mach-E EVs…

But the core of this investigation – EV battery sensitivity to fast charging – represents a “potentially bigger hurdle” to broad EV adoption, according to Jeremy Michalek, Carnegie Mellon professor of engineering and public policy. Though the issue isn’t “universal,” it does reach beyond the Mustang Mach-E, Michalek said in an interview with TheStreet.

“Some battery chemistries are very robust to fast charging while others degrade very quickly. So it does depend what kind of battery the electric vehicle has in it, how sensitive it will be to fast charging,” he said. “But there are batteries being used today that are sensitive to fast charging and will degrade the battery much more quickly.”