I set up my cell yesterday, have not powered it on yet though. I bought the liquid lighting from Walmart too. I looked up the MSDS by the web site listed on the bottle I believe, or maybe I Google searched it. But what I found says that it is only something like 60% sulfuric acid. ( sorry I don't have my notes in front of me ). This could be why some people are having too much copper going into the acid. If too much water is present in the cell it will get hot fast.
I put my liquid lighting in my crock pot, out in my shed, set it on high for 3 days . When it finally stopped heavily steaming and forming bubbles I shut it off, let it cool, and checked the specific gravity. According to notes I found on here it looks like I now have something like 85% sulfuric acid.
Will 85% be OK for my cell?
Thad