I have a 2003 18T sport auto. Over the past few months it keeps getting a flat battery.I am at a loss as to why and hope someone here can assist if i give the details. The car is only used at weekends but has always been ok starting. When the car started getting a flat battery i changed the battery,the battery already on the car was only 14 months old and a Audi part. With new battery fitted flat again in APX 3-4 days. Called breakdown to jump and test and was told there was a 0.8 amp drain,which is too high.I took the car to a Audi dealer who did a over night drain test twice.both tests showed a normal drain. I was told that the car should be used daily and that is the problem.I should start and run the car mid-week for 45mins. I have been doing that untill mid-week it failed to start!!! Called break down again to jump start and again they see a high drain apx 1 amp. Booked car into Audi for drain test again.2 drain tests showed below normal drai 0.045a, I think. They told me the drain the breakdown sees is normal.There is a drain in the system for 6-7mins at start up. They told me that the only flagged problem is a radio problem on the A4.The radios in question have a red/orange dot somewhere,which mine did not have. I have been told also by Audi that this is a intermitant fault and unless it occurs while they have it there is nothing they can do. If i park that car on their forecourt i gaurentee it will be flat in under a week,surely there must be a problem to find!!!!! Any help or ideas would be great at the moment it is really inconvient. The breakdown guy said it is proberly the Alternator drawing back current??? but Audi dismissed this. I have not had anything fitted to the car prior to problem.