I am demoing a lemon battery made with a copper sheet electrode and a galvanized nail for the Zn electrode. I get a voltage of 0.954 volts from the battery which slowly decays over time. Why is my voltage this close to the 1.1 V expected value if my concentrations of copper and zinc ions are so far from standard conditions? Does anyone know the actual half reactions at work? How can I increase the current from the cell other than placing several lemons in series? In other words, what is likely to be limiting the current? Why can't I hook up multiple electrodes in series in the same lemon and get a higher voltage? Why do texts make it seem like a salt bridge is mandatory in electrchemical cells when this example proves it clearly is not?