Just took the batteries out of my mark VII, which has been displayed with the plastic tabs in for the last month or two. No leakage. Almost stripped one screw but managed to get it out... And noticed that one screw was missing entirely lol... Email to sideshow coming up.
However, I did check my baggy of other batteries from transformers I have taken out, which has been there for a good while now, and tho I have checked them several times, of course right after reading this thread is when I open the baggy to find they are almost all exploded. Burned my damn finger through the plastic.
I stored all my iron man batteires by wrapping the ones that go together in cling wrap (like three times around each battery before adding the next one, then putting each of those in tissue paper and those in a bag. Thing the cling wrap will keep them from exploding?