Whats the easiest and best way to check for a drain on the battery? Had a couple of starting issues this winter, 1 i know was from the mrs using it for lots of short journeys with every bloody thing on, heater,seats, stereo blah blah, got it started and put some life back in but wouldnt start last week again. Mr AA suggested checking for any drain, whats the best way to do this? And does it need to be parked and off for a while before doing it, to make sure all the PC's/etc have shut down fully? Think he said leave it 30 mins?