The electrochemical noise of a solid polymer air–hydrogen fuel cell was measured at different loads. Some of the common approaches to data treatment of electrochemical noise were tested. The dependences of the standard deviation and second and third central moments on the constant load current were calculated. The distribution diagrams were constructed. The spectral power density was calculated by Fourier transform using the wavelet transform and also through the standard deviations in the given frequency band. The data calculated by different methods were in good agreement.