hmm...I think 5 mins is not long enough....is like when i switch off the washing machine at the plug..for a min or two the lights stay on..im sure that the same is with a car..that just because you disconnect the battery does not mean that all electrical impulses just go poof!!....Half an hour sounds more likely considering the size of it and all the electrical systems in it,. And what is the difference between half an hour and"at least half an hour"???? ;) No you shouldnt have owned up...........Take some evening primrose oil and you will feel much better with that PMS!! :D