Hiked to a convenience store for lunch (1 mile each direction, 30 minute round trip) Wednesday and found this object. The label says "GREENCELL EXTRA HEAVY DUTY 0% MERCURY".
And my favorite part (caps lowered for de-emphasis):
"Warning: May explode or leak if recharged, disposed of in fire or dissected."
"15G R6 Size AA 1.5V Product of Gold Peak Group"