Diehard batteries are made by Northstar and owned by Advance Auto Parts and sold exclusively at Advance, Sears and Carquest.
Penn Manufacturing and Johnson Controls are who makes batteries for Oreilly's.
Super Start AGMs are made by East Penn in Lyons Pennsylvania.
The majority of batteries sold by O'Reilly are manufactured by Johnson controls, the same manufacturer of interstate batteries.
Johnson Controls supplies more than one third of the world's lead-acid batteries to automakers and aftermarket retailers including Wal-Mart, Sears, Toyota, and BMW.
Lead acid battery brands produced under this business unit include Continental, OPTIMA, Heliar, LTH, Delkor and VARTA automotive batteries.
Everstart batteries used to be manufactured by Johnson Controls and it actually stated so on the label.
Walmart offers car batteries under the "EverStart" brand, which is exclusive to Walmart stores.
The manufacturers of EverStart batteries have varied over time, but as of the most recent information available, Clarios (formerly known as Johnson Controls Inc.) is the primary supplier of these batteries.