here's an especially encouraging finding to ease your uninformed 'angst'...
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How Does EV Battery Longevity Compare to ICE Vehicles?
Both of the mandated warranty numbers (8 years, 100,000 miles) for EV batteries far exceed the average ICE vehicle drivetrain warranty of 5 years or 60,000 miles. The average lifetime mileage of an ICE vehicle is about 133,000 miles. While experts estimate the average EV battery will last around 200,000 miles, some manufacturers already promise much more than that.
And the news gets better: Tesla has their sights set on a million-mile battery, and claims that they are not far from achieving this goal. On average, EV batteries only degrade at a rate of 2.3% of maximum capacity per year, so with proper care you can reliably expect your EV battery to last as long or longer than ICE drivetrain components.
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Ta-Da!...feel better now?
Link: https://www.evconnect.com/blog/how-long-does-an-electric-car-battery-last