In this work, an efficient and non-disruptive alternative to the GITT is proposed: the intermittent current interruption (ICI) method. Our group first developed the ICI method for characterizing the porous carbon electrodes in lithium-sulfur batteries, and the method has more recently been applied more widely for different battery cell chemistries. The method introduces transient current interruptions (usually 1 to 10 seconds) while the cell is under constant-current cycling. By analyzing the potential change during the current pauses, quantities describing the time-independent and time-dependent parts of the resistance can be derived, which are termed internal resistance and diffusion resistance coefficient, respectively. With the porous electrode model, it has been shown that the derived diffusion resistance coefficient is proportional to the coefficient of the Warburg element used when fitting electrochemical impedance spectra (EIS). Since the Warburg element describes both the capacitive behavior in porous electrodes and diffusion processes , it is a logical consequence that the ICI method can also characterize diffusion processes in an electrochemical system.