Hello, hopefully this will sound familiar. I have an 2001 Audi A3 1.8. with no modifications. The battery has started to go flat. New battery and everything has been tested, alternator okay, no drains when on or off, with or without alarm on. And the electrician could not find any problem. It has got the dreaded 4 beeps coming from the boot. Could the siren battery cause a drain on the main battery? The electrician, is very familiar with Audi, but he didn't make a connection. Also, one time I remember sitting in the car with everything off and hearing something from the boot, which sounded like the CD changer trying to engage. I didn't make a connection at the time because the car was working fine? Any ideas? Thanks for any help.