We can already do more than 50 miles of range in 5 minutes. For example a Tesla Model Y is rated at about 0.234 kWh/mile, round up to 0.25 kWh/mile. To get 50 m

We can already do more than 50 miles of range in 5 minutes. For example a Tesla Model Y is rated at about 0.234 kWh/mile, round up to 0.25 kWh/mile. To get 50 miles of range you need 12.5 kWh, in order to get that in 5 minutes you need a charging speed of 150 kW. Tesla V2 superchargers already do 150 kW and V3 does 250 kW, which would only take 3 minutes to get 50 miles of range. Of course the actual charging curve depends on your battery state of charge but 50 miles in 5 minutes is very achievable in most cases, at least with Tesla. Now doing this in a portable way is the difficult part. There are a few trucks now that can do 7-10 kW output to charge cars, but that's only about 30-40 miles of range per hour, which is still quite slow. But it might be enough to top you up for 15-20 mins to get you 10-15 miles down the road to a charger. I imagine this will improve though quite a bit as more EVs are adopted. I think if we can get to 50 kW chargers from service vehicles that's good enough. On a 50 kW charger 15 minutes of charging will give you 50 miles of range on a Tesla, and on less efficient cars it will still give you at 30+ miles.