Went to go out this evening, and neither of my two keys will unlock the car or do anything at all. I know the batteries in the keys are fine. I get no response from the car at all (no hazard lights or alarm blip). Could this be a flat battery in the car? The red dashboard LED is happily flashing away as usual - would this be possible with a flat battery, or is the electrical draw so low it doesn't matter? I haven't tried unlocking the car manually for fear of setting the alarm off as it is getting late now. I just wondered if anybody had experienced this before? The car is 53 plate with an alfa battery (not sure if original) and the car has been parked a couple of days, though it seemed fine before.