In this paper. the Dual Kalman Filter (DKF) is used for the parametric identification of an RC model of a Polymer Electrolyte Membrane Fuel Cell (FC) stack. The identification is performed for diagnostic purposes. starting from time-domain voltage and current signals in the framework of Electrochemical Impedance Spectroscopy (EIS) tests. https://parisnaturalfoodes.shop/product-category/vit-a-w-e-oil/