I'm pretty sure that 80% if what we learned from the Nazi/Imperial Japan super unethical experiments was "what can a psychotic doctor justify in order to have an excuse to torture people to death."
Maybe 20% was arguably useful, and most of that could have been researched ethically with other methods.
In theory, higher voltage × lower amps = same power (W=V×A, you can double V and halve A and get the same power). Or in this case, double the double the voltage, same current, double the power maybe?
There is still some voodoo happening with the batteries to be able to take the charge so quickly. More battery cells charging in parallel is probably part of it, but it couldn't be all of it.
Really tough to speculate off of this thin announcement.