When the water content deviates from a pre-defined certain range, humidification or purge operation can be performed. With the development of localised EIS, spatially resolved water mapping can potentially be inferred from the electrochemical measurement alone, with previously correlated neutron imaging and ML providing the model to relate EIS to local water content. A promising way of revealing the fundamental mechanisms underlying local performance disparities is therefore possible, facilitating optimisation of fuel cell structure design, manufacturing processes, and operational conditions. This deviation in water content prediction arises from the coupling factors of the changing water content method and the long-time measurement in this study. When introducing a fully humidified reactant directly, the change in water content is rapid.