Back up and take another run at it Mr Martin. Was it an inflater that was operated which resulted in a no start? And how long was the CD operated and were the interior lights also on when the no start occurred? I would imagine that if the inflater was run for 10 minutes with ABSOLUTELY no other drain on the battery a good battery should have been able to crank the engine and half an hour of operating the CD with ABSOLUTELY no other drain should have left adequate charge to crank it. But sitting with your foot on the brake pedal and the courtesy lights on for half an hour will take a heavy toll on a battery.