With similar chemistry to the Hyundai Ioniq Electric, that charge rate is very doable.
I thought Fisker promisted 125 miles in 9 minutes.
Let's presume it has a big pack (400 miles), and similar consumption to Model S. So, around 300Wh/mi. It might have permanent magnet motors, after all? 133kWh needed.
To charge 125mi (37.5kWh) in 9 minutes, would take (60/9) * 37.5 = 250Kw average charging over those 9 minutes.
Ioniq pack: 28.0 kWh, 360V Lithium-Ion Polymer Battery
It charges at a peak rte of 70kW. Let's take 68kW over 9 minutes to be safe.
Extrapolate 28kWh to 133hWk -> 4.75x larger in capacity (not necessary weight or volume).
4.75 * 68 = 323KW charging.
So, easy peasy. Basically, Fisker is claiming to have SLOWER charging than the $32K Korean offers.
And if the 400 mile claim is European, it would be less for EPA, so around 115kW and a proportionately lower required charge rate.
Really, it's Tesla's turn now. Up the chemistry. We no longer *need* density, it's just nice for production costs so they can make even crazier margin on the battery part of the equation. To truly conquer the car market now, faster cells need to be used to make of the capacity. Chargers are coming (CCS 350kW, Tesla maybe faster?), so where are the Tesla packs to use that charge rate on? Current 100kWh cars are heavity throttled to 1.12C peak, whereas original S85's still get 1.44C.
If Fisker were to use old school Tesla cells, they might actually get close to that 9min/125mi claim already. At present chemistry and further reduced by the larger 2170 form factor, Tesla itself will have much more difficulty...
Fisher with old S85's cells: 133/81=164%
117kW*1.64= 192KW. A good way near 250kW compared to Tesla's 115kW today.
And if somehow the Fisher is 140kWh and actually only uses 280Wh/mi, it would charge those old 18650's in 9 minutes to 108 miles.