Just got a "new" SHARP calculator (more about it later). There were
batteries inside (2xAA). They are labelled "Jade in Japan" and their
production date is 06/1986. They are dead now, of course (it's 2020,
after all) but they look intact: no shape changes, no leakages, even
case color seems to be still same. Someone forgot them inside and they
made no damage to the calculator (it works great with a new set of AAs.
They are labelled MADE IN JAPAN. It says it all...