The typical working voltage of the battery at room temperature, also called the nominal voltage. It is a selection of different types of cell reference. The working voltage of the battery varies with different conditions of use. Open circuit battery voltage is equal to the positive and negative electrodes of the balance difference between the electrode potentials. It is all about the type of electrode active material, and has nothing to do with the number of active substances. Battery voltage is essentially a DC voltage, but in some special conditions, electrode reaction caused by the metal Crystal or certain membrane phase transitions can cause voltage fluctuations, this phenomenon is known as noise. Small fluctuations in a wide range of frequencies, so they can be distinguished from the self-induced noise in the circuit.