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Originally Posted by Matterhorn Fan
I've been told that if you touch the battery to your tongue, the strength of the shock you feel is an indication of how much life is left in the battery. Granted, this was told to me by a crazy person, and since I have no interest in subjecting myself to mild electrical shocks of any degree, I will be forever ignorant of whether this was a joke or not.
If you want to try it, go ahead. Let me know if it works.
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Obviously, this (practically) only works with 9 volt batteries (although I would like to meet the person who could get their tounge to touch both the positive and negative terminals on a "D" cell battery).
The jolt isn't too bad - mostly startling. And you have to have a fair amount of experience to know the difference between the jolt from a good or bad battery.
And never stick your tongue in a wall socket to see if it is working.