I copy the list below from an Xterra forum where it was posted in Aug 2019. I'm not sure how accurate the list still is 5.5 years later when I'm posting it in Dec 2024.
Autocraft: Johnson Controls
Sears- Diehard: Lead Acid- Johnson Controls, Platinum AGM- Odyssey, Gold Advanced AGM- Eastern- Penn.
Interstate- Johnson Controls.
Walmart Everstart- Johnson Controls (Exide Contract Cancelled).
Autozone Duralast- Lead Acid- Johnson Controls, AGM- East-Penn.
Pep Boys (including Bosch)- As of Aug 2012 Exide
Napa- Lead Acid- Johnson Controls; AGM- East-Penn.
Optima- Johnson Controls.
Varta AGM- Fall 2012- Johnson Controls in a new US plant.
Costco-Johnson Controls.
Northstar- Northstar and also distributed by Batteries Plus as the X2Power and Exide under the Northstar label.
Duracell- East Penn (Deka)
Rayovac (Batteries Plus)- Lead Acid- Johnson Controls; AGM- East Penn (Deka)
Deka- East Penn
I'll add to that list Oreilly Superstart is made by East Penn. I just bought a Superstart Extreme 34EXT group 34.
Johnson controls is now Clarios, but still same products AFAIK.
Someone else in another thread at this forum said that local Walmarts get their their Everstart batteries from the nearest manufacturer/supplier. Sometimes East Penn, sometimes Johnson/Clarios. If that's correct, then some Everstart are East Penn, and some are Johnson/Clarios depending on where your Walmart is located. Either way Everstart is reputed to be good as are East Penn and Johnson/Clarios.
I think East Penn and Johnson/Clarios both make good products. Who you buy from matters a lot too. Price, warranty, service all matter. Service matters most to me because I'm handicapped. I get best service from Interstate sellers and Oreilly Superstart sellers.
An important, but often overlooked thing is in store battery maintenance. Do they keep their instock batteries charged, or do they ignore them and let them deplete? Interstate sellers and Oreilly put their batteries on chargers regularly. Does Walmart do that? How about other sellers?
Let the games begin! OK, that was overly dramatic. Let discussion begin.