This instructable is a battery made of pennies, salt water, and nickels. It produces voltage much like a battery, but you use pennies and nickels instead. It is a fun project for those pennies and nickels you don't wish to use anymore. Most of us don't usually go to the coinstars, and our change just piles up, so make a battery out of them!

Go to the next step for Items you need.

Step 1: What do I need?

Here are the items you will need:

For about 1 volt, you will need:

(6)Pieces of paper towel cut to a size smaller than the nickel
(1)Glass of water with 2 Tablespoons of salt dissolved in it

Optional: Multimeter to measure the amount of voltage you have prodced.
<p>Used the experiment to teach electrolysis to my son. It produced a charge of 3.6v. We substituted the paper porous separator with a cotton cloth scavenged from an old tee shirt. 30 minutes later and it still has a 1.9v charge. </p><p>Compressing the pile causes problems. Although placed in a specially designed Lego rig (lol), the compression causes contact between the Penny/Nickel pairs resulting in loss of charge. Next steps to improve the setup:</p><p>1- I believe larger than recommended porous separator dimension would minimize that problem.</p><p>2- 100% synthetic fabric instead of cotton might help.</p>
<p>Hello! does anyone know if there is a way to make them last for longer? if i am correct the only reason they stop working is because the electrolyte evaporates? so is there such thing as an electrolyte that is solid/longer lasting?</p>
<p>Hello! does anyone know if there is a way to make them last for longer? if i am correct the only reason they stop working is because the electrolyte evaporates? so is there such thing as an electrolyte that is solid/longer lasting?</p>
<p>it's so amazing. follow it and i did make my own battery. Thanks,</p><p>http://batterychargersexpert.com</p>
Ever since pennies became zinc with a thin outer layer of copper, I've been intrigued by the idea of building a battery from ONLY pennies. But I can't think of an easy way to get rid of the copper on one side (and part of the edge? Of the penny. Any ideas out there?
Coat one side with a chemical resist(Asphaltum, tar, hotglue, etc). Place in a warm citric acid bath Check every hour or so. The stronger the solution, and the warmer the bath, the faster it'll strip the copper. Citric acid is usually available in grocery stores. Make sure to use the correct year pennies... Some will be all copper, some steel, some copperplated zinc.
Does citric acid really etch copper? I guess the big problem is that it'll eat the zinc away too. I don't think I know of anything that will dissolve the copper and stop when it gets to the zinc.
I think cyanide will but ii is hard to get and toxic.
<p>Ya and how can coins have electricity</p>
sorry for the long delays in responding.... Yes, citric acid works well. Not so much etching, as disolving into solution. In my college "small metals" classes, we used a stainless steel tub with a low LP flame burner under it, as a "pickle tank". Mainly to remove the scale from a piece, after soldering. It's effectiveness is llustrated by the nice blue color the liquid developes after a few days use (copper oxide is blue-to-green in color) it takes a while, but I've had students leave their 20-22 gague wire projects in the bath over the weekend, and come back on monday to fid only the heavier gague plate remaining.
anything after 1982 is copper-plated zinc. Some 82's are this style - some are the older (mostly) copper style
<p>l33tn00b's method uses sand paper or a dremel to sand of one side of the penny. I tried it and It works well and is actually better than this method</p>
belt sander with a jig the size of the penny do it sticks out just a little you you can sand off some of the surface.
ferric chloride solution or sodium metabisulfate in peroxide. same stuff used to etch a PCB should take the copper off.
Sand it.<br/><a href="http://www.instructables.com/id/The-Penny-Battery/">http://www.instructables.com/id/The-Penny-Battery/</a><br/>
They have these nifty tools now called files..:) Or you could try contact electrolyzing it..
We messed around with pennies in metalworks, and figured out that sanding them or filing them will get them nice and silvery shiney pretty quickly. (If you use a dremel with sandpaper it'll take under a minute.)
it's simple i just filed off the copper from half of the penny and stuck it into a lemon ... ishould really make an instructible on that. I GOT DIBBS ON IT!
Go for it! Attaching wires to both sides of the coin might be a challenge...
nice :-) To avoid soldering, try artic silver epoxy? and stick the other wire directly into the fruit :-) Classic potatoe clock, except with a higher amperage?
UK pennies are copper plated steel these days. Concentrated nitric acid will remove copper quite effectively (I've done it, and this is how I know they're steel inside). However, the cell is only going to last as long as the copper-plating
It's the steel/zinc side that gets eaten away. The copper stays relatively unaffected. (at the Zn electrode, the reaction is Zn -> Zn++(aq) + 2e- (and the electronic travel off down the connected wire.) At the Copper electrode, you just have 2e- + 2H+ -> H2 (gas) (electrons from the wire, H+ from the acid electrolyte.) (huh. I spent a bit of time searching, but I didn't find a web page that I thought explained this very well.) The fact that you don't need "substantial" copper is one of the things that makes the copper-plated pennies so interesting...
Iron and Zinc have different redox potentials, I've not found coins made of zinc. However, I may see what can be done...
<p>I'm doing this for my project and did you copy this or did you made it up?</p><p>(:D I &lt;3 THIS PROJECT!!</p>
<p>what if the pennies and the nickels touches each other??? because the paper is smaller....☺☻&hearts;&diams;&clubs;&spades;&bull;◘</p>
Can I use pure copper instead of pennies?
Yes you can.
if your doing this in america, this is illegal. while it is legal for the distruction of pennies, you cannot legaly destroy nickles or any other form of currency.
Where am I destroying or defacing any piece of coinage? This experiment is far from illegal.
zinc deteriorates as it is used with acids and copper. This means your are literaly destroying the money. give it time and you will see the damage. I backed this up when i made a lemon juice battery, and the zince rod flaked apart in the juice and disinagrated. and that would be defacing or destroying government property, which with the exception of pennies, is illegal.
Get A Life. How about if you don't like the experiment move along. We all like it, we think it is interesting. Besides show me one official who would take the time to come after someone using 15 cents of nickels and 3 cents of pennies. Do you have any idea what it would cost the FBI to even listen to your stupid compliant. I wish you would call someone so they can laugh in your face as hard as we did.
Look up your facts-PENNIES and NICKLES are (were) illegal to melt for metal content because the metal content value exceeded the face value FOR A SHORT PERIOD OF TIME. Copper prices are down, so it's no longer illegal because the mint would make money now where they would have lost money when metal values were higher.
Negative. Otherwise those penny presses at Disneyland (the ones that press pennies flat and then engrave a copy of Sleeping Beauty's Castle in to it) would be illegal. Who wants to raid Disneyland?
no, i said it is legal to destroy pennies. i said it was illegal to destroy the nickles.
No, it's illegal to MELT DOWN COINS (specifically pennies and nickles) FOR THEIR METAL CONTENT in batches of more than $5. Art projects involving coils are ok. Look it up on the US Mint website.
no, a law passed states that specifically pennies can be melted ONLY for their metal content. And i've been to that website. It isn't completely accurate. Also, this isn't an art project, it's a science project. Nickles can't be melted at all.
Just shut up and admit you where wrong. Besides no-one cats what you think is illegal or legal. Move along little little girl.
Wow ,,the US MINT dont know SQUAT aboutits JOB ??????
btw there are nickle presses at Disneyland too... and at sea world...... and the San Diego zoo. plus its the US MINT website...... if anyone knows whats illegal to do with US currency. its them. maybe your other source is false.
As opposed to melting them for???? If you can show me the federal code, I'll believe that the US Mint's guidelines are wrong. Until then, I'll believe that the US Mint knows about US coins : ) And nickles melt at about 2700F : )
<p>The exportation, melting, and treatment of 5-cent and one-cent coins are prohibited, except for educational,amusement, novelty, jewelry, and similar purposes as long as the volumes treated and the nature of the treatment make it clear that such treatment is not intended as a means by which to profit solely from the value of the metal content of the coins. See https://www.federalregister.gov/articles/2007/04/16/E7-7088/prohibition-on-the-exportation-melting-or-treatment-of-5-cent-and-one-cent-coins#h-12 for details.</p>
<p>I made this! But no pics</p>
<p>Hi, Im making a penny battery for the science fair! Im in 5th grade I was held back once supposed to be in sixth. way behind on this project </p>
I like you project-I'm in the 5th grade and I wish it was in a smaller photos -and wording so I could print it. I cannot download it. Thanks-
how long do they tend to last
Until the juice dries up, however long that takes.
You can make them last even longer if you seal them in plastic wrap or large shrink wrap to keep the moisture from evaporating so quickly. Just a thought.
Desperate? Yes! 2 multimeters later I still get no readings. What are average results for this if you start with 4 cells and go up 1 by one to 10? Voltage? Current?
This is really cool. I'm sure I've seen it somewhere else a buttload of times but I still think so.<br/><br/>Oh and this is a <em>cell</em>, not a battery. At least I think so, correct me if i'm wrong (maybe if each of the coins is a cell on its own).<br/>

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