Did you ever wonder why 1 group of people will say brand X is the worse battery made while another group will say brand X is the greatest? There is a good reason for this. The following was taken from another web site that explains why. (BTW, I prefer Delco Voyager)
"Lead-acid battery manufacturers, distributors, exporters/importers, large chain/auto parts stores, or major dealers will often private label their batteries, for example in the North America, EverStart is private label for Walmart and DieHard for Sears and Kmart. These stores might have these private labeled batteries made by several manufacturers depending on the location to reduce shipping costs or to provide different types or sizes of batteries. Contracts with manufacturers might change."