Sure the current ~250Wh/Kg LiIon battery tech gets many jobs done that could not be done with earlier battery technologies. That is not the same thing as sayin

Sure the current ~250Wh/Kg LiIon battery tech gets many jobs done that could not be done with earlier battery technologies. That is not the same thing as saying that further improving the technology would accomplish nothing (as seems to be implied). Gasoline is about 10X that at 2500Wh/Kg (albeit also requires carrying around fuel storage tank(s) & a combustion engine, which is only ~40% efficient on a good day). Getting battery technology up to nearly those energy densities would completely revolutionize everything. Current phones would have 1-2 weeks of battery life, or you could power a pocket workstation (if you could cool it). Ordinary multirotor drones would fly for hours instead of 15-30min. Electric airplanes would be quieter and more efficient.... the possibilities are nearly endless.