If eight flashlight batteries in series have an emf of about 12 V, similar to that of a car battery, could they be used to start a car with a dead battery? Why or why not? My friend posed to me this question and then I just sort of stumbled and was dumbfounded. I answered it by saying the internal resistance for 8 batteries would be too high to be useful for charging, but I'm not quite sure if that's exactly right or if it's the reason why you can't charge a car battery like that. Can someone clarify?