Lithium polymer is solid and rather inert.
Europositron batteries use sodium chloride as the electrolyte.
Supercap "batteries" use an inert ceramic like material.
As you can see, not all high capacity batteries have to be toxic or corrosive and their desirability will include such factors.
I realize it is rather late but you seem a little grumpy. I don't think you really want anybody intentionally exposing themselves to battery components, toxic or not 'k.
No, I don't. But at some point it will happen because AFFORDABLE battery technology means a lot of acidic toxics. At least with petrol, it is sufficiently volatile that it will evaporate off (unless it meets a spark or hot surface), but it's a danger we're more or less used to.