I'm quite awe by how everyday household objects ( well except cola since I love drinking water xD ). You are able to make a successful battery that make your LED light O_O ( stands for light emitting diode) . You need the following items cola or in American terms coke , coins , a cup with salt and aluminum foil . It will work
probably about 2 volts and only a few milliamps, but its still can't pass those companies that sell batteries commercially ( obviously )
Credicted to 99media
I heard there's another method which uses lemon to make the batteries.