to charge a dry cell it needs to be on the lowest setting possible (lowest amperage?)do not use one of those arlec charges with one setting and yes if they are left uncharged they do not like charging. usually after a couple weeks from my experience.
the battery should not be interupting any of the charging duties of the battery that i know of, i may be wrong.
if the battery was that hot and hissing, its cooked, might be from the charger being too strong. replace and get the battery checked too make sure it is stuffed.