Aotearoa / New Zealand

The truck companies I've seen doing hydrogen are generating the hydrogen themselves with water and electricity. I'm not sure whether it's financially viable or not, they seem to be doing it for the reduced carbon emmisions.

And yeah, you're right, a common battery standard will probably only exist if say GM or some group of Japanese car companies uses a standard across all their brands and allows this to be used by others. In other words, chances are probably pretty slim.