Or does it keep going until the car is actually turned off? I'm guessing this is what would happen, seeing as there would be a residual charge to keep the car going, in the event one of the terminals came off or close to it.
Reason i ask, is i was out and about, stopped the car momentarily in front of a shop and tried to start it again, completely dead, absolutely no lights registered at all, dash or door lights etc.
Went to check the battery and wtf... one of the terminals was just barely hanging on.. I have an R33 Nissan Skyline which has the battery at the back of the car.. cool huh, not. I had some car audio work done recently and realised the installer hasnt tightened one the bolts on the terminal clip properly!! Didnt have an adjustable spanner handy so managed to get it finger tight. Started the car, and im away again. Home now and have tightened the clip with a spanner.
So to the above.. No chance of the car just turning off if one of the battery terminal clips came off while driving? In one of my previous cars, i blew an ignition module while turning on a roundabout.. car died immediately, power steering died too, didnt complete the turn and introduced myself to a houseowner's picket fence in spectacular fashion.. hoping it's a while before i experience that again!