Guys, I have a problem with water collecting under the battery in the boot compartment. The car is usually garaged but has been outside this week (various reasons, don't ask), it's rained quite heavily this week and I found about an inch and a half deep puddle of water under the battery tray. I've had this problem since I first got the car but since I don't leave it outside usually or drive it in the rain I just waxoyled the boot floor and forgot about it. It looks like the car is going to be outside quite a lot now so I need a resolution to this problem, any ideas? I have noticed a white plastic tube that is under the battery tray and then goes through the floor. Is this something all M3's have or do you think this an attempt by the previous owner to sort the prblem?