At least I don't think it's possible... Jump start an ICE. I'm getting my old car ready to sell. It's been sitting for a couple of months as a whole bunch of life stuff seemed to happen at once just after getting my Model S. I found the battery was so flat the other day the dome lights wouldn't come on. I jump started it with my SO's Impreza. It had to run a while to charge up the Buick's battery enough to start the car. As I was doing all this I looked at my Tesla in the garage and thought of the irony that the S has more battery power than any car in the world, but I can't use it to get the Buick started. I know the Tesla has a 12V battery, but I don't think it's a high current system. I believe it's only used for keeping the electronics running. I got there in the end anyway.