Test the Strength of a 9V Battery With Your Tongue

About: I'm a Research Engineer at Adobe. Previously, I was a grad student at the Center for Bits and Atoms at MIT Media Lab. Before that, I worked at Instructables, writing code for the website and iOS apps and m...

Wondering if your battery is running out of juice?  Stick it to your tongue briefly to know for sure.

First inspect the battery for any noticeable signs of degradation, rust, battery acid, etc.  If the battery seems reasonably clean, stick it to your tongue.  You will feel a slight jolt and metallic taste.  You'll probably need to calibrate your tongue by testing a fresh battery and a dead battery to get an idea of what to expect.

Luckily my friend SHIFT! was around today to demonstrate.  Notice his pained facial expression in the first image, this is definitely a new battery.  In the second image he seems unfazed, this battery should disposed of.

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    17 Discussions

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    Steven.Work

    6 years ago on Introduction

    Warning - there is a larger voltage battery which is the same shape and general form then the regular 9 volts. 24V - I think. This procedure above will knock you on your bottom.

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    nflpanthersfan

    1 year ago

    Those faces he made are not what he would actually make if he was not doing it for demonstration perposes, i tried it and its only a small momentary "burning" feeling on my tongue

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    chaparro78

    3 years ago

    I did it with a crank generator 100 volts and 10 people holding hands... cool

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    tbarot

    4 years ago

    I had a battery lying around and thought of trying it and just loved it. it's a new experience for me and I tried it 3-4 times

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    KGuy

    5 years ago on Introduction

    Haha......my father told me to do this when I was young. I remember looking at him thinking it was a joke.....but his face was very serious. I still love this way to test it :P

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    KemikalzAreFun

    5 years ago

    I may be a little weird, but when I was younger I used to do this for fun... When you're homeschooled you don't have to many friends to hang with... This was fun :P

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    iceng

    6 years ago on Introduction

    So as a teenager I wanted to make an electrical Popsicle to alleviate sugar from kids teeth.

    In the experimental process my tongue learned  to tell positive from negative and
    voltage within 2 volts up to a painful 12VDC.  Also DC and AC.

    BTW 52 ibles in just a little less then a year ... WOW

    A

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    ejp1087

    6 years ago on Introduction

    I do this all the time to check 9V batteries. I don't see why some people think this is dangerous. I even had one guy warn me that I'm going to kill my self after he saw me do it once :) 9V batteries can't put out all that much current, and the current that does come out just goes from one spot on your tongue to another spot less than an inch away. Sure it might sting a little (it more just tastes funny) but it's nowhere near your heart or brain so you'll be just fine.

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    youn_link

    6 years ago on Introduction

    this is dangerus and irresponsible, and belive me is crazy do this with brakets

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    lord_kian

    6 years ago on Introduction

    This is a good but not ac cúrate método to test a battery a battery solución is buy a cheap multimeter