I
highly doubt you could use lead in a cell.
The only reason lead can "withstand" the sulfuric acid is because of its own electrolysis of its self during recharging. See the sulfuric acid bonds with the lead when electricity is allowed to pass(ei. when its loaded). So as the lead becomes fully Lead sulfate(sulfide, sulfite. I don't remember with one) the battery dies. But when you recharge it. It electrolyzes the the lead sulfate and becomes lead and sulfuric acid. So lead is not resistant to acid. (I might have the charging and "decharging" switched. I haven't looked at their cycles in awhile. So it might be fully charged when its all lead sulfate but can't remember.)
Plus. Something called lead poisoning. Its when lead reacts with water. It creates PbO. Lead oxide(might be lead dioxide. I'm a bit rusty on my chem.haha.). Thats why the Greeks(think it was the Greeks who had lead pipes.) had so many problems with their drinking water. Its also known as metal heavy poisoning.
So after writing all that.. I'd have to say Lead is a no go for electrolysis.
But They do claim Stainless steel is safe. But safe is such a relative term.
-Randy