It's a dimension of performance, like many others. But lifecycle CO2 footprint is currently the most important performance metric of cars from the holistic pov.
Yes, battery capacity is the main thing when you compare early EVs. I think the amont of energy the battery can generate and how fast the car can drive a long distance does fit the performance definition, but I agree it’s not the classic definition of comparing the speed on a tiny segment.
On short distances, the 22kWh version is actually a bit faster because the battery is slightly lighter.
