The temperature of space is a fascinating topic. According to various sources, the temperature of space is generally around 2.7 Kelvin (-270.42°C or -454.75°F). This temperature is known as the cosmic microwave background radiation, which is the residual heat from the Big Bang. This temperature is not constant throughout the universe, but it’s a good average temperature for the vast emptiness of space.
EV batteries seem to lose power here on earth at much higher low temperatures.
So, it still remains sounding like science fiction, to me.