OK, but at this point you've ignored so many problems that why even use the current battery lead limitation. Who's to say we won't be able to charge at 1.21 gigawatts? I've seen it done, you just need a portable nuclear reactor (or a lightning strike).
Ok, I'll bite...
Lets start with the disclaimer that while I know a respectable amount about a lot of things in science, I'm not a chemist. I know that LION batteries are pretty durable, have a respectable power output for their weight when compared to pretty much anything, and a much lower environmental impact than most other energy storage types. I'm also aware that there are temperature restrictions to the reversible chemistry of the little Lithium ions floating between their plates; outside of a prescribed range of roughly 32-100F bad things happen when you charge rapidly. That's about it.
That's the chemistry that I don't think we can easily change right now... if I knew how to make a better battery... uh... lets say my "location" tag would say "private Caribbean island with nuclear weapons".
But... those "other" factors are all things that can be fixed with today's technology for the right price. I know (thanks WK057 et al) that there are some coolant channels in the battery today, but don't know the cooling capacity of them.
Power company drop... easy, for the right place. Maybe someone's uncle wants a SC at their nuclear power plant, and has a excess 3GW capacity due to the propensity for fracking now-a-days on the open market. Real example: Here in Chicago we had a steel mill close in one of the industrial districts... it was the single largest consumer of power in the city when ingots were heating... now, demolished and waiting for someone to build condos on it. But the infrastructure remains, I'm sure ComEd (our power co) would be thrilled if someone wanted to pay them for a OMFG ludicrous 3ph power drop.
We know the SC bay uses an array of chargers, so we could theorize that a bigger array = more DC output.
For charging cables, there are a billion ways to keep them cool, a finite, non-zero number being practical. Remember your gas station days? Those hoses sucked air/fumes while they delivered that icky dinosaur juice; what if we ran coolant through them in one direction and electrons in the other?
Saying "yeah, coolant is the limiting factor cuz the cable from the charge port to the power pack isn't in a coolant bath" is a fine way of conclusively answering the question... just have not torn down my car to be able to say that myself. I can cool the parts after that (outside the car).
Maybe (and I'm stretching here) a pulsed DC would have a better net effect (doesn't AC call that "RMS" voltage) on power as it relates to battery chemistry that would be harmful continuously?
And lets say it is a battery limit... ok, we know the P90DLs have a "beat up my battery, I know it is not covered under warranty, but I need them HP's right now so just do it" switch... what if I wanted to catch my dying relative's last words and didn't care if my battery went from a 8 yr useful life to 7 yrs, 11 mos, 3 weeks, and 6 days if I got to hear them because I only needed 5 min at the supercharger rather than 20?
Consider it a thought question...
:wink:
