I worked at an alternator shop in Delray Fla. for a year, way back in 1980. 95 degrees at 9 AM in the summer, we had big three foot fans mounted in the back of the bays! You got used to it.
There's another book I could write. It was in the same lot as Evaul's Auto Repair. Bob Evaul had a great customer relationship; he would SCREAM at his customers. They were mostly elderly condo-dweller retirees from all over the country, those were the days of the Dodge Darts, Chevy Novas, Ford Mavericks. He had a great customer base hahhahahah, he did honest repairs. The guy looked like Rod Serling, we could see his shop caddy corner to us on the same lot. We all thought he would stroke out, it was entertainment to see him stamp across the lot cursing.
Anyway, point is, in those days I knew the complete chemical cycle of a lead/acid battery. I could draw you the schematic of a Delco alternator. We carried Interstate batteries, always thought that is a great brand. When the lead plates get sulfated, and recharging can't drive the sulfer back out of the plates into solution, that's it. There was a trick that never really worked, of dumping the electrolyte and refilling a bad battery with pure distilled water. Charge the hell out of it, and there's a slim chance the plates will recover.
Somebody just gave me a Murray mower, I tried to charge the battery, it is a stone dead plastic box, no hope for it.

also JB welded a hair line crack on the exhaust manifold to the Ford 8N--I'll 2nd coat it tomorrow AM --been sitting all day w/ 1st coat--