I have revived a few batteries by zapping them really hard for a few seconds with a surge of amps(100+) and then they would take a charge with the regular setting of 15 amps or so. Sometimes there is a small short within the plates and that surge will clear it out...LOL
disclaimer: I would stay away from the immediate area in case the battery busts it's case. Eye protection and keeping some distance would be my recommendation. My F-I-L was twisting the cables on top of a top post battery and the post broke off and created a spark inside the battery that set off the gasses that built up during charging. I had to lead him into the house so he could flush the acid off his face and arms. Luckily he didn't get that stuff in his eyes.
That's some funny words of wisdom right there! Who's trying it first?
Dave
FUeL 69 Camaro RS BuilD by G-Force Design & Concept
68 Corvair coupe
65 Impala SS
64 Corvair Rampside
62 Corvair Greenbrier
Asst. daily drivers