Went out Friday night in the car. As i locked it and walked off, the alarm went off. Unlocked and relocked it and alarm didn't go off again. After 2 hours, I go out to my car to find that the fob wont unlock the car, i then realize that the red flashing immob light isn't on either, so I'm thinking flat battery, although its a bit odd to be dead after only 1 hours when lights weren't left on... So I unlock the car with the key!!! get in and nothing lights up. I open the bonnet, swap battery for a fully charged spare from my old A3 and car unlocks with key, turn on ignition and get wood thinking it was just a flat battery and I can now drive home, go to start it and get a click click click from the engine area, try once more and get the same, then car is dead as it was before. I went and got ANOTHER battery from my uncles Astra, put it in the a3 and it was still deader then madeline mccann. Sat morning I tried jumping it from uncles van and was still getting nothing on the dash at all. I have tried earthing using jump leads, checked the fuses that sit in the little plastic bit above the battery, and cleaned some of the rust from a couple of the cables that go into the same box that the 3 30amp fuses are in (after spraying them with wd the car actually came alive, but by the time I had gone to get some gunk to put on the connectors to stop any more rust occuring, car was flatter then a witches tit again ) Anyone got any ideas, suggestions? Bump starting is out the question as it's parked on a majorly steep hill.