I bought a 'new' (2004) Subaru Forester last week. The other day, I took it in to have the wheel alignment checked, and once they had finished aligning it, they came back and said "the battery was flat when we tried to start it to take it off the ramp" - and lo and behold, when I tried to start it to leave work later the same day, it was indeed flat. The car hadn't shown any signs of a weak battery beforehand, and when I got home, I measured the voltage on the battery and it showed a healthy 12v (and started again happily), so had presumably charged itself up fine on the way home.
So the question is, what on earth did they do to the car, in 20 minutes, to flatten the battery?
(needless to say, I won't be going back to the same tyre shop!)