Hello, I have a few technical questions about the xDrive30e that I can’t explain to myself: 1. If the battery is empty, how does the xDrive work? Does it always leave a rest of the battery so that the xDrive can be switched on in any case? 2. What about the boost when the battery is empty? Does the motor always return to the battery boost and xDrive is available? 3. If I drive in cold conditions with electric drive and then overtake e.g., the cold petrol engine starts and turns up? Does it warm up the petrol engine? 4. At what speed does the electric motor no longer work? Thanks for your input!