Solid state batteries will enable astonishing hypercars (think 10,000 hp for less than a porsche) but will also make small and cheap lightweight EVs feasible (ie 1000kg) due to mass de-compounding effect.

Residential battery costs less than an iPhone…

Volumetric vs gravimetric density. Cars have heaps of space but smallish weight budget. Phones are opposite.

Sounds like cops should just arrest anyone who uses one then?

Sounds like you found a niche that market hasn't exploited then. Can I build a small house for fraction of the cost or most of my cost is going to be land?