This has almost nothing to do with the battery… the AA batteries you buy down at the corner store now have a 10 year shelf life easy. It has to do with the absolutely picoscopic amount of power required to stimulate a nerve cell. The operating power draw means a primary cell with very low leakage has the chemical capacity to operate something as low power as that for a very long time. Even the RF receiver does not need active power if they use a basic charge pump to trip an input line… totally and ghoulishly insecure, and would be dangerous if used for pacemakers… but this is a tongue stimulator… still… would be fun to drive around with a 1W transmitter just dumping out carrier wave to see who’s tongues start sticking out of their faces as they are walking down the street 
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