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In this application note, electrochemical impedance spectroscopy (EIS) is used to test a commercial battery connected in two different ways. In the first EIS measurement, the battery is connected in a two-terminal sensing configuration. In the second EIS measurement, the battery is connected in a four-terminal sensing (Kelvin sensing) configuration. The difference in how the leads are connected results in different measured impedance values for the battery. 

 

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