Lime Battery Documentation

We did the Lime Battery test. It was very interesting. We ended up having to use like 7 limes to be connected to get one LED to light up.  We put a penny and a nail we cut a little slit in the lime and stuck the penny in one side and a nail on the other side. The metal nail was the negative port and the nickel or copper Im guessing of the penny is the positive side. When connecting the wires to the lie like a battery we are able to produce a current that eventually charged enough to turn on the LED. Unfortunately I didn't get a photo of when I was doing it but Ill will still post a picture on here explaining the concept.