Hello
Many thanks for reviving this thread. It prompted me to take the back off a rarely used multimeter...... agghhhh green "fur" starting to grow around the end of a 7-years-past-use-by AA cell
I seem to have been lucky - the deposit was dry and the plating of the terminal looks OK so I've wiped on a little WD40 with a cotton bud and fitted a fresh cell, this time with a note in the case as a reminder to check.
BTW the old cell seemed to be still working in that the ohmes ranges zeroed OK.
Bye
Will