Helped to start the car exactly twice in relatively warm weather in the fall. In winter, after the car was idle for several days, when I really needed it and there was no one to light it at a distance of 25 km, I simply clicked the relay in the cable with crocodiles and winked three charging lights at 75%. I do not recommend to buy. At the right time, you will remain freezing by the car with a charged device in your hands.