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Earth batteries fall into that category of interesting but mostly useless knowledge. They have very low energy density, low voltage, are terribly unreliable and can not be recharged. To get anything approaching useful power the size of the plates would have to be so large as to make the project far more expensive than buying a good battery.

There are many many ways to make a battery. Pennies and vinegar, a lemon and two pieces of metal, etc. but for a reliable power source a FLA (flooded lead acid) battery is the most practical way to go. Period.