Then again, that study assumes cars will be on the road for 18 years (??!!??), with no major repairs especially no battery change.
The current average age of cars in the US is 12 yrs. How's that supposed to jump by 50% ? I understand electric engines themselves are simpler and more durable, but you still get accidents, chassis issues, steering issues, vandalism/theft, evolving fashion and tech... and you add battery issues: a smartphone's battery barely lasts 5yrs, I understand car batteries are sturdier, but ... 3.5x longer-lasting ? If they need replacing, that's a major source of extra pollution.
I'm all for cleaner cars, I actually don't own a car myself. But a study based on 18 years (+50% !) of product life isn't convincing, unless they prove cars in general and batteries in particular can last that long.