hey now let's leave the deities out of it....
you literally have two working ice vehicles that are 20 years old and haven't had anything changed / replaced?
like, there's components on both platforms that will need to be replaced eventually. brake pads. hvac coolant. I'd be amazed if your 20yr old ice vehicle had it's original alternator, water pump, etc.,
because the burning focus you're placing on the cells themselves is silly when you think about all the maintenance and repair / replacement an ICE vehicle will require.