Just so you know, Autozone Duralast Gold batteries are the same as Sears Diehard batteries, and the same as Interstate batteries. They are made on the same line at Johnson Controls in San Antonio. (my brother's wife's sister is the head of Human Resources there, so if you need a job I can probably get you an interview
).
Johnson Controls makes the three above batteries, as well as
some of the Everstart Maxx batteries (Exide makes the marine batteries), ProStart, Costco's Kirkland batteries, Acura, Advance Auto Parts, Autocraft, Western Auto, Tough One, Hellar, Alliance, American Hardware, Ames, Varta, Blain's Farm & Fleet, Bosch, Champion, as well as the OEM batteries for Daimler Chrysler, Honda, Toyota, Nissan and Isuzu.