I HEARD ABOUT THIS BELL AND  I THINK ITS WAS REFERED TO AS A KARPENS CELL !  LARGE THICK PLATES ARE GLUED WITH WHITE GLUE ( PVA ) AND PVA HOLDS A TINY BIT OF MOISTURE SO THE PVA ACTS LIKE A ELECTOLYTE BETWEEN THE THICK PLATES AND THE PVA ONLY CONDUCTS A VERY TINY AMOUNT OF ELECTRICITY BASED ON THE ATMOSPHERIC MOISTER SO THEY LAST A VERY VERY LONG TIME !  THERE IS ANOTHER BATTERY THAT LAST A LONG TIME BUT INSTEAD OF PLATES IT USES LARGE JARS OF LIQUIDS AND THE OUTPUT IS VERY LOW LIKE MICRO WATTS SO IT LASTS MANY DECADES !,(reply>), ACombineSoldier they're screaming,(reply>), YOUR CAPS LOCK IS ON IDIOT