Does my car battery emit Hydrogen Sulfide gas when charging, or just Hydrogen gas?
I bought the battery around July 2014 (brand new), and because I did not drive my car for a period of one and a half months, it went completely flat. I tried charging it with my 3 stage charger, which did not seem to work - there was a constant rapid flicker of the charge light, I had the battery out of the car on a rubber mat, and charged for minimum 12 hours with no result. I then did the intelligent thing and connected my battery to my dad's old fixed-volt charger, which did the job.
However, because I do not use my car regularly, the charge in the battery has dropped low again. When looking at the battery now, it has dry residues around the terminals and on top of the case. Just wondering if the battery fluid might have been boiled by my dad's fixed-volt charger, and whether it's safe to use my 3 stage charger on the battery. My concern is that the battery might release Hydrogen Sulfide. I know batteries release Hydrogen gas as a normal part of the charging process, but do they release Hydrogen Sulfide gas, ever?
Note: the structure of the battery casing is completely sound with no signs of obvious damage from charging (unless you count the dry residue around the terminals), and I have always kept the cells topped with distiller water. And yes, I charge my car batteries in a well ventilated area so Hydrogen gas build-up is not an issue. It's he corrosive Hydrogen Sulfide gas that concerns me.