I just got out my Nikon F2 with MD2 and MB1 Battery pack which I hadn't touched in 2 or 3 months. It was sitting alone in is bag with nothing else touching it or putting pressure on any switches or buttons. The alkaline batteries were last known to be fresh. But I discovered it a little while ago to be dead as a doornail. I mean totally slap dead with .101 volts at most apiece. What might have caused that?