Clarios was sourcing batteries from a Saudi joint venture a few years ago. As well as the units from their European subsidiaries.
Doesn't seem to make much sense to ship lead/acid-filled polypropylene containers halfway across the world, but it has been a feasible solution for them.
And I wouldn't be surprised to find that Walmart is using Clarios as a turnkey provider, like Costco does, and it's actually Clarios doing the sourcing, and all the heavy lifting, so to speak.
Lead acid batteries are a dirty, and potentially costly business for those making them, selling commodities. To most consumers, they're fungible goods.
Easier for retailers to just to rely on one of the big manufacturer/distributors, and save the potential headaches by slapping brand labels on what you get from one of those companies, regardless of where they come from.