what's this "electricity and Epsom Salts" Terry
I'm always keen to try something on a buggered battery.
Well I remembered my father in law (RIP) used to drop some carb soda in the battery in his old XP Falcon whenever the battery was feeling it's age, and up until a few years ago you could buy a little bottle of "Battery Reconditioner" which probably did the same thing in theory, i.e., ate away the sulphation from the lead plates.
I did some youtubing recently and Epsom Salts came up quite regularly. One guy was flushing his old battery out with a slurry of ES and demineralised water, which looked a bit too labour intensive for me, because I couldn't see that he got his battery back up over 13 volts, but other guys were just dumping teaspoons (as many as you'd like, I don't know if there's a magic ratio or not) of ES in as they were hooked up to the charger.
I did the latter, and have been rewarded with the son's battery bubbling away as it's charging, like a good one? I've got a battery tester that puts a load on the battery and usually mine discharge very quickly under load, but not in this case, it appears to be (borderline) good? Not bad for what must be at least 10 years old, and has sat, totally flat, for the last 8? And it's not even a "Quality" brand, it's a "Supercheap Auto" battery, which is even more surprising.
We'll see what happens, but I'm so impressed with this one, I'm shovelling ES into a couple of other bike batteries in the hope that, like Jesus, they'll somehow come back to life. I'm not sure what I'll do with them if they do, because I've already replaced them, maybe I'll have to buy some more bikes that those batteries will fit, so I don't waste them?