I feel terrible asking this question but I have to know here it is??? I have looked everywhere. 2001 A6 4.2L.

 

OOO OOO I got this one, have you checked under the back seat. There are two screws in the front. Lift up, be amazed at all the interesting things in your car.

 

Eeeee, that's the first thing I do when buying a car check under the seats "for money" lol

 

I found three sets of keys under a backseat once. One benz key, one porche key, and a chevy? key.

 

so if the battery is under the rear seat, am i accessing it through the trunk? sorry I'm a girl and don't get it []

 

As dan908 said its accessible from the rear passenger area. There are two screws to remove under the front of the rear set cushion.

Question is are you needing to access it to replace the battery or for some other reason?

FYI... If you need to jump the car to start it or something like that, you can access a positive post in the engine compartment. If you have the manual it should describe this. But if you do need actual access to the battery for maintenance or replacement its under the rear seat cushion.