I worried about the battery until I had this thought (and looked at the 8 year warranty ):

Phone battery, charged every night, approx 1000 charge cycles thus lasts 3 years ish.

Car battery, charged as needed maybe every 4-7 days. Approx 1000 charge cycles thus lasts 12 to 21 years. Total battery failure is something else entirely but you said “worn out”.

If you needed to charge every night it might mean short range which means cheaper battery to replace or you are doing lots of miles. My car could do 200 miles easily before recharging or up to 300 with more care. If doing 200 miles a day you are doing 73,000 miles per year so in 3 years 220,000 approx. Any car probably needs some serious work done to it after that much.

Anyway we are still bringing this tech along so I reckon either prices will drop and/or car manufacturers will make them more serviceable so you don’t need to replace the whole thing but maybe sub modules at a time.