If battery tech was easy and it only failed to progress faster due to lack of a well-funded use case, then submarine warfare should have brought us to Tesla-grade batteries in no time.
That did bring them nuclear reactors though. Hasn't helped my electricity come from nuclear.
That's the next step though. SMRs, Small Modular Reactors. Basically the same sort of thing that's in a submarine but dotted around our neighbourhoods and cities.
We are never, ever going to see SMRs dotted around our neighborhoods. I like the concept of nuclear power in general, but the security and terrorism concerns alone will kill any possibility of putting them in residential areas regardless of any potential economic benefits.
Panasonic-grade
Fission batteries, baby!
Currently there are two land vehicles that drive with them :)