I am working in a laboratory practice, analyzing the basic battery cell constructed with copper and zinc electrodes, submerged in an acid electrolyte (like vinegar). I need to relate the area of the electrodes with the acidic environment (and probably temperature) in order to determine which dimensions would be necessary to obtain such a constant current of 10 mA within an acceptable decline (10%) of the terminal voltage (for a few minutes). Please, I would appreciate information about this topic, in such a way to determine if it is possible (convenient) to built this didactical device.