So as you might have heard Porsche announced they were working on a new charging system for their upcoming Mission E and Audi, VW EVs down the pipeline. They claim a 15 minute charge rate for 80% using a 800V system. I don't know much about batteries or EVs other than what I research and try to learn but, to my understanding simple pros of a 800V hypothetical Tesla Model S would be; Lighter, thinner cables for both power electronics and Supercharging equipment. As you'd need less current for the same amount of power. No need to use space grade inconel at the fuse to support up to 1500 Amps. Same power can be achieved with only 650Amps. Or use the same thing and double the power. AFAIK charging a battery pack is limited at what the cells can get, not delivering the power. If so a 20 stall supercharger already has 1.3mW of power available spread across 10 banks, 20 stall. Be it an iPhone or a car lithium ion batteries can only charge up to 80% in a fast way (Depending on your cells' max. C rates) and the rest, afer the cells reach peak voltage is CV stage where current tapers off. Suppose Tesla changed the layout of their current pack to use same cell count but connecting 37 cell parallel making a 122Ah cell. Making 12 groups per module and having 16 modules. Result would be a 700V nominal, 122Ah cell. Still around 85kWh. With the current C rates Supercharger delivers it could start its depleted charge at 615V, 270A = >165kW. Faster charging? There has to be some downsides to it too or else why would virtually ervey EV is 400v? If not, why not make a kilovolt EV? Electric hyper car Rimac Concept One's pack is more than 600V I think. I am also guessing that the chargers' work would be more difficult too as they'd work as transformers? Also DC-DC inverter would have much more work too I guess. Someone who knows this better than I do could explain.