In general, when fully charged, a low-power diesel engine (1.6l, 110 horsepower) at a temperature of about zero barely tosses and turns. It can be seen that there is not enough current. As a result, it is impossible to start only on this battery. Can only be used to help a not quite dead car battery. For example, I managed to help a car battery a couple of times at a temperature of minus 10 degrees. But when the car was completely exhausted, this one did not help anymore .