6 Cent LED Throwie




About: Ask me questions. I know the answers.

Make an LED Throwie for 6 (six) cents - it's the cheapest Throwie ever!

LED Throwies are popular contraptions made of a battery, an LED, and a magnet all taped together. This version does not include a magnet, although it could.

This project uses the same principle as Tool Using Animal'sPenny Battery and Brenn 10'sPenny and Nickel Battery. It uses pennies as electrodes and vinegar water as an acid you make a battery that will power the LED.

The video that this is based on can be found here.

If you like penny batteries, you're going to love the 500 lb. potato battery.

Step 1: Get Your Supplies!

For this you will need:

  • 6 pennies
  • Section of matte board or porous cloth
  • Vinegar
  • Salt
  • LED
  • Tape
  • Sand paper

Step 2: Sand the Pennies

Use sand paper or a sander to completely remove the copper on one side of 5 of your pennies. If you're using an electric sander please use appropriate safety gear, and do not sand yourself.

Step 3: Mix a Salty Acidic Solution

I used mostly vinegar and a little water, then stirred salt in until it stopped dissolving.

Step 4: Soak the Fabric and Start Stacking

Place one penny with the zinc side up, and place a piece of soaked cloth on top.

Place another penny facing the same direction on top of that.

This is one cell. Now, keep stacking to make your battery stronger.

Cap with one un-sanded penny.

Step 5: Finish It Off

Once you've capped it, carefully tape it (if you like) and insert your LED, with the positive end on top.

The LED should light up.

It's not very bright, but then again, it's running on only six cents!



    • Pets Challenge

      Pets Challenge
    • Sensors Contest

      Sensors Contest
    • Classroom Science Contest

      Classroom Science Contest

    134 Discussions


    10 years ago on Step 1

    i'm spanish and we do,'t have penies, u think that could work wiyh euro cents?

    6 replies
    I Love Gunsampeyro

    Reply 10 years ago on Introduction

    Euros won't work because you need both zinc and copper plates touching to work, such as inside a penny. Euros are made from copper and steel. Oh, if you dropped the e in penies it would... be rather amusing...


    7 years ago on Introduction

    what if you just get a a lot of batterys and make a unicorn so you become a penquin bounty hunter of the coast of mc donalds. mmmm.. but if you do the math in youre head youll come up with 5 trolls and the divide that by burger king and youll get one half a wizard of oz and 1 fourth 4th of a dorathy, lion, tinman and a scarecrow.

    1 reply

    I'm somewhat confused as to the meaning of this message, but I'm fairly certain there were some questionable substances used in its production.


    7 years ago on Introduction

    so can i make bigger battery and not use coins??


    8 years ago on Introduction

    AWESOME!!! i was going through some pennies and i found a 1943 steel penny.


    8 years ago on Introduction

    Rule 1: Follow all rules.
    Rule 2: Never have more than one rule.


    10 years ago on Introduction

    Cool Idea. I do recommend TESTING YOUR PENNY (especially in CANADA) to make sure it is COPPER. to lower the cost, our government (Canada) now makes the penny out of steel and plates it with a tiny layer of copper. that copper will sand off during the cleaning of the penny. Verify it is copper with a MAGNET as a real penny will not stick Mitch

    1 reply

    Reply 10 years ago on Introduction

    i read once that if the penny was solid copper it would be worth approx. 5 cents...

    hmmm that gives me an idea. Get a hundred dollars in pennies and sell them at 5 cents each 5x100= $500!
    then get the 500 in pennies, 5x500=$2,500
    You could be a millionaire in no time!