Excide makes their batteries at this moment 11/2013.
Bosch
The OEM batteries for Audi are either Varta or Moll.
Johnson Controls
East penn
Johnson Controls Inc. makes AutoCraft Gold Battery, OPTIMA, Interstate, Motorcraft, & Energizer car batteries.
Johnson Controls
Exide
Interstate Battery Company
Johnson Controls inc
Interstate is a battery company making their own batteries since 1950.
Johnson Controls