800 km from 253 kWh is 316 Wh/km somewhat worse than my ancient (2015) Tesla Model S. newer versions, models, and brands do better. So for most buyers this is not an improvement. Also performance at -40 C is irrelevant to the vast majority of drivers.
You are correct that range for many cars with Lithium (NMC) batteries is halved when the ambient temperature is below about -10 C. But an important caveat is that this applies principally to short trips where the battery never warms up such as driving 10 km into town and back to do some shopping. On long continuous journeys the decrease in range is much less marked.
You are correct that range for many cars with Lithium (NMC) batteries is halved when the ambient temperature is below about -10 C. But an important caveat is that this applies principally to short trips where the battery never warms up such as driving 10 km into town and back to do some shopping. On long continuous journeys the decrease in range is much less marked.