Creating light from earth, air, metal and an acidic solution is not such a major task. Oxidation and reduction can be used create a potential difference between two metals placed into an electrolytic solution. These free electrons can be used to power small electronic devices and even recharge an iPod. I noticed that the volume of electrolyte does not overly effect the amount of amps produced and have made a quick video example showing that. 

The following video shows a simple 3 cell earth battery that produces a few volts. The main aim of this experiment was to try to increase the amps of the battery with only a serial series. It looks like the solution of electrolyte can achieve this. The next step is to find the right kconfig of parallel and serial series to produce the most usable power.