According to link dated April 2023 manufactured by Johnson Controls.
Who Makes Duracell Car Batteries? Who Makes Duracell Car Batteries? Duracell is a trusted name in batteries, and for good reason. Duracell car batteries are so
autoemc.net
"Although Duracell is owned by Procter & Gamble, the batteries themselves are actually produced by Johnson Controls, a large multinational corporation based in Milwaukee, Wisconsin."
I know I'm dragging this thread back from the dead a little, but just saw this response.
Besides reading from multiple sources a while back about where Duracell units were made, the CCA numbers lined up more with Deka batteries than Johnson Controls (now called Clarios after they sold off their battery division to an investment group) or Exide.
Generally, all you have to do in a single battery size (e.g. H7) is identify where one battery is made. Every one of the big three manufacturer's batteries usually have slightly different amps/CCA in any single size. While Deka may have 800 CCA in a particular size AGM battery, Johnson Controls may be 850, and Exide may be 900. (Random numbers I came up with just for sake of argument.)
Once you identify one, you can immediately tell across the board (for that size) who makes the battery. So using the example above, if O'Reilly's AGM battery in that same size is 800 CCA, its probably made by Deka. If Autozone's battery in that same size is 850 CCA, its probably made by Johnson Controls. So on and so forth.
Obviously thats not a guaranteed thing, but a "general rule of thumb" so to speak. However, even when you have IDed the maker, with today's prevalent outsourcing and everything else, its a little like oil filters. Sure, the 2022 batches of brand XYZ were great, but then they switched factories or sources, and the 2023 batches of that same XYZ brand may be mediocre or worse. This is evident by a few members posting earlier in this thread about supposed Deka batteries from Turkey.