I’ve read there’s about a half dozen or less automotive led acid wet cell battery manufactures and from there it’s who’s sticker is on the case.
I’ve bought all of my batteries from Bi-Mart for several decades. Now they only warranty them for a couple year (replacement), although previously they had prorated warranties up to 84 months. I’d estimate about 10% of my Bi-Mart batteries were returned dead (not taking a charge) during the prorated warranty period (I usually have about 5 or 6 vehicles at any given time). The other 90% went beyond with no trouble.
I suspect that manufacture’s continue to make goods less durable, on purpose for the opportunity to sell another one just out of warranty. Plus, there’s enough customers that you can screw a new one every day and never get back to the first one, so repeat customers really aren’t a concern.
Of the two new Honda batteries (not counting the one that was in a totaled new car) I’ve had, one died prior to 3 years (so far, the other one is about 39 months old). After the Honda dealer summoned the gods, played with a fancy tester or or two, squinted at the results in disbelief and Bluetoothed and emailed it to the president (someone anyhow), they replaced my battery and I only had to redo all four fasteners correctly when I got it home.
I’d buy a 3 year off brand battery over a Honda battery with less thought than I’d give buying a tank of gas. In fact, I’d use the cost difference to buy that tank of gas.