Last weekend I obtained a pristine Sharp EL-211 for my collection. That device was offered in 1980. I paid two dollars at a church rummage sale. One end of the carton was slightly damaged. Inside I found the calculator, the instructions and a pair of AA cells. The calculator was still in its plastic bag. I don't think that it had ever had cells installed.
The two nonrechargeable AA cells are still in a sealed plastic bag. The nomenclature is Sharp UM-3(E)1.5V. There is no sign of leakage. Will this kind of cell last forever?. Are 32 year old never-used cells of interest to anyone?