The latest modest scale battery technology is also a game changer from my consumer perspective. I use Jackeries (which do what you're talking about for lots of money XD), and mine from last year uses a chemistry that gives a maximum of perhaps 1.5A even though the capacity is quite high. The one from this year that uses lithium iron phosphate is happy to output 10A.

It's wild, I was able to power an AC brushless motor as well as a corded (technically?) drill. I could have run the drill for an hour at full power.

All around it just improves so fast I'm starting to feel like I do about computers -- the longer I continue to be satisfied with my current setup, the better the next one will be!