More and more LTH batteries are rebranded then sent to the USA.
I have NOT done this in decades, but the *only* way you can determine the reality of origin is to weigh a genuine maroon case T105 or 125 case battery (the one with the embossed letters) then compare that with other samples.
Trojan makes other GC220 batteries and they are all lighter than the maroon cased battery. They have red lids and white cases.
Who is to say East Penn makes only one grade of GC220? I can't.
Nor can I state all Mexican batteries are made with virgin lead. I do not know but I can ask this question: if not Mexico where does all the recycled USA battery lead go?
Mexico does not have different weights of same BCI battery. For instance all LTH batteries weigh the same within their BCI group size. GOHNER the other major manufacturer does not make anything but ill-,regarded calcium/calcium sealed batteries.
I am unable to lift a battery. When my garbage GOHNER battery went dead in a USA COSTCO, both Mexican mechanics I was with hefted a bunch of different BCI grades off the stand and whistled at the heaviness as compared to a Standard LTH battery as sold south of the border. The battery I purchased is a group 34. It is several pounds heavier than the LTH version. Supposedly a Johnson Controls product.
Flooded battery cases weigh within ounces of each other. It would be miraculous for two manufacturers to make a finished product that weighs exactly the same as a competitor's.
Speculation is a waste of time.
Unless a person is in the battery business, only reputation is valid for judging a battery. The fact that Trojan AGM batteries are represented by Rolls & Surrette to me is meaningful. So is the fact that Rolls choice was first Concorde, who refused to sell to them (or anyone else).
Get accurate. Take a scale along.