The Science of Licking a 9V Battery - News - SparkFun Electronics - Lick a 9 volt battery
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There are plenty of things you should lick in this world: Ice cream from the But if you lick a rectangular 9-volt battery, touching both the positive. Hell, I convinced my 3 yr old daughter to put a 9-volt on her tongue. She thought it was hysterical, did it several times, went out and got her cousins to do it.