Lithium batteries do have less usable capacity in extremely cold weather, but the real killer is heating. ICE cars have abundant waste heat to warm the cabin, but an EV has to use battery power. For a short journey on a very cold day, it's possible to use more energy for heating than propulsion. EVs are increasingly equipped with heat pumps, but you're still unavoidably going to see a reduction in range as soon as you turn on the climate control.