The majority of lead-acid 12-volt car batteries sold in the US are produced by:East Penn Mfg. Co. (DEKA)Stryten ManufacturingClarios, LLC It’s important to note that each of these manufacturers sell their batteries under numerous brand names to car manufacturers and aftermarket retailers. For example, brands made by Clarios (formerly Johnson Controls) include: Optima, Duralast, Interstate, and AC Delco. East Penn produces NAPA batteries. And both Clarios and Stryten provide batteries for Walmart. If you’re looking for a battery replacement, please don’t hesitate to reach out to our service department and we will be glad to answer any questions you may have