When the battery is discharged to zero, it charges the car the first time! With half a kick, as they say. Charging is fast, you don't have to wait long. The device is assembled qualitatively, small, convenient. The equipment is serious, the manufacturer did not stint. I bought this device last winter, it helped me out many times, I always carry it with me just in case of a fireman. In an emergency, it's simply irreplaceable. In general, I'm satisfied.