So what is the coordination between batteries doing? Is it moving electricity through the walls to balance things when the grid is down? How is it different than a typical UPS like for servers or other electronics? Just bigger/longer lasting battery? What integration need is their with typical home systems? (Beyond things like turning them off when battery gets low?)

I kind of don't really get what having an app for a battery does that just sticking UPSs everywhere doesn't, other than maybe having a better battery.