So I was pretty sure after spending all that time charging it and having it not have any amps that it was a bad battery. And when I first brought it home and put the charger on it, it was only at 60%...see previous post.
I stopped off at AutoZone (who does free tests) and asked them to load test it. He had a load tester, so he walked out in the cold to my car and checked the battery I had sitting in the back ready to return to the OTHER store where I purchased it. It tested bad. Ah HA! Confirmation! Vindication!
So I went to that unnamed large retailer and returned the battery. He asked me if I wanted an exchange or a refund. Well, I thought about it and asked him "can you test the NEW one to tell me if it's OK? Do you test
batteries?" He didn't know, but would call. Tried to call the Auto department, and nobody answers! So he doesn't know but probably not. So I'm thinking, "I don't want to go through this again." So I told him to refund the cash to the Credit Card. That's the reason I went to that store to begin with...because cash flow this month is tight, and putting it on a CC was an advantage. But if this crap happens, not fun at all.
So got the refund no problem.

And went back to that AutoZone where they were so nice, and it turns out that my battery that I've had for 4.5 years still has a partial warranty. So I got a few bucks off a replacement since I had purchased it there 4.5 years ago (didn't remember, and didn't expect much back as it's pro-rated after 3 years for a max 5 years).
Anyway, got a new battery, swapped the old one, got a few bucks off, installed it right there in the parking lot (had tools, but they would have loaned them and/or probably even installed it. Only took 5 minutes.)
Off and running on a new battery. Finally.
Moral: Don't
buy batteries from retailers where they sit around for 6 months on the shelf and who can't even test them. Even if you have a CC.
So after that: