I did a little research and this is what I found:
"Current is the flow of electrical charges (usually electrons) in an electrical circuit. When you hook a lightbulb to a flashlight battery, the current flows from the negative terminal to the positive terminal, always in the same direction. This is called DIRECT CURRENT. Electrical current from a standard household outlet changes direction 60 times each second (50 times per second in Europe). Because the current flows first in one direction and then the other, this is called ALTERNATING CURRENT."
Our RC CARS use DC. Thats why I think we should have our best battery in the negative to sustain the pack and lessen premature dumping. Because if it is the other way, if the worst battery is in the negative and it dumps, no matter how much is left on the other cells, you race is over, but if the best battery is in the negative, it will keep sending "electrons" over the cells that is low or have dump. And hopefully prevent DNF....ouch!!!! But , then from what I have heard, this is also the cause of "reverse polarity". That is why, it is absolutely important to have a truly "MATCHED" pack.This is my suggestion to folks like me who got just a few packs to race with, unlike Factory Guys who have almost perfect "matched" pack.
Maybe if you can get one of the electrical engineers to shed some light to this, will be greatly appreciated. Thanx