Lime Battery

One lime=0.95 volts
Two limes=1.96 volts
three limes=2.9 volts and lit up a LED
HOW DID WE DO IT?
We put a piece of copper and a nail into a lime and connected it to a volt meter. this made electricity.
QUESTION
will it improve the effect if you put more wires/nails in?
yes! if you were to put in three nails and three copper you get three times as much electricity

lemon battery