Audi A4 2003 battery change how?

I formulated this same question a few days ago, but now that ATT and Yahoo joint strengths..or so they say they deleted all my email and my questions. Has anybody done it, or has a real knowledge about changing it, my friend 'a mechanic, told me not to cchangebecause the computer will be reseted and would not start the car again I need to get a cigarette lighter adapter with a (9 or 12 volts ) battery connected while changing it, I received 5 answers very well presented yesterday but no one since to have a real knowledge of this specific car and situation I have connected a 9 volts batt to a cigarette lighter adapter and I am about to change it the car is out with no power and I find ludicrous two it to have the battery changed.Audi A4 2003 battery change how?haha wow idk what the heck ur friend is talking about your car will start everything will get reset and you may need a radio code if the radio goes into safe mode but you should have that in ur manual but itll be fine just go do it.Audi A4 2003 battery change how?lol plug it into an outlet...idk...Audi A4 2003 battery change how?you will be fine. the car will still start.Audi A4 2003 battery change how?The car will still start but everything will run through a %26quot;start up%26quot; of sorts and as stated above youll need to enter a radio code. I would keep the charger hooked up while you replace it, just makes it easier.