Volkswagen owns Audi.
Excide makes their batteries at this moment 11/2013.
Bosch
East penn
Johnson Controls
Johnson Controls Inc. makes AutoCraft Gold Battery, OPTIMA, Interstate, Motorcraft, & Energizer car batteries.
The RS4 is produced by Audi.
lamborghini,audi,porsche,
Audi R8 GT Spyder, base price is $210,300
Johnson Controls inc
Johnson Controls
Exide