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With 10 pennies & Speed Stick Deodorant I will show you how to make a battery to power an led or more depending on the amount of batteries used.  Entered into the pocket size contest PLEASE VOTE

Step 1: small amount of deodorant

deodorant contains zinc that is why it can be used , take a small amount less than the size of a penny when flattened

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good idea, well instructed.... <br>But, once the vinegar dries up, dont you need to &quot;refill&quot;. In your experience, how long it lasts without refilling (re-constructing)...? <br>Any way, thanks for sharing..
I have had my single battery powering an led for almost three months now with no change. I also made a 3.5 volt for my fish tank that I recharge with my solar panel. <br>I don't think it's a matter of the vinegar being &quot;wet&quot; once it is saturated into the cardboard dry or not it will still be there so it should work indefinably.
Entered In The Pocket Sized Contest Please Vote!!!
<p>I remember making a project like this in grade school for a science fair.</p><p>But some things I've learned over the years;</p><p>any pennies made after 1982 are 92% zinc. But, they are coated in copper, so some sanding is required to sand them down. The vinegar, which has acid lets the metal flow as ions throughout the battery. The battery dies once all the potential energy is drained from it, not when the vinegar dries or anything like that. This is a chemical process. That being said, I'm NOT sure hooking up a solar panel can recharge these batteries. I'm looking into that as I type this...</p><p>BUT one thing to be noted, I've seen other people build 10 cell batteries using the method I stated, and it lasted 2 1/2 weeks only powering an LED. That being said, there's no clue as to what happens when it's connected to a solar panel, as I haven't seen that applied to any of these batteries. </p><p>It may be possible, but I have yet to find out. I'll update upon finding the result.</p>
great idea.really awesome.same to you.keep up the good work

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