Help!!! Its driving me mad
 

HI all my first time on here so hello to all.
Anyway the issue I have is, have the A4 Quattro Avant 2004 and upon start up last night when keys were put into ignitionand tuned I had a continuous beeping noise comming from what seemed like the dashboard. This carries on when engine is engaged and only stops when keys are taken out of the ignition.
Have been told by one or two people this could be the back up battery for the alarm needs changing I have no idea.
Any Ideas chaps its driving me mental AGHHHH!:(