However, the time required to perform a GITT measurement remains one major drawback. In order to reach the equilibrium condition, the test cell has to be relaxed substantially longer than the time spent on applying current. This results in an experiment that can be anywhere from 8 to 100 times longer than a typical galvanostatic test cycle. Although the test may be accelerated by increasing the duration of current pulses and selecting only the initial datapoints for the analysis, this reduces the number of measurements of diffusion coefficient. In addition, such a test protocol makes it difficult to couple GITT with simultaneous materials characterization, e.g. diffraction or spectroscopy, which can provide valuable structural and/or chemical information at the moment where the process under investigation takes place. In other words, the length of time needed for a typical GITT experiment essentially precludes its use in operando methods, and hence the coupling of operando methods with diffusion coefficient measurements.