An 9 volt square shaped battery is used for all sorts of small powered electronic devices, from fire alarms to kids toys. If you don't have a multimeter or a special tester tool to test your 9 volt battery, you can test it using your tongue. That way you can determine if the 9 volt battery is fully charged or completely dead, using your own judgement tactics. Don't worry about doing this, sticking your tongue on the 9 volt battery is not harmful, you won't get shocked or die from it lol. This is because it hasn't got enough amps and voltage to do so, so lick with full confidence!
1) Stick your tongue out of your mouth.
2) Obtain your '9 volt' battery and lick the the two 'Positive' (+) and 'Negative' (-) terminals found on the top.
3) If you feel a little 'Sting' and a 'Metallic' taste on your tongue, on the area you licked it, it indicates that the battery is charged. If you feel no effect what so ever, then the battery is dead and needs replacing with a new one.
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