The US Fuel Cell Council (USFCC) published a standard for single cell testing that includes specific break-in procedures: Verify break-in status by repeating the polarization curve sequence three times, or as necessary, to ensure that the cell is broken-in. Remain at each sequence step for 20 minutes. The cell is considered broken-in when less than a 5 mV deviation from the previous polarization curve is recorded at 800 mA.cm -². A wait period of 10 minutes should be observed between polarization curves. During this period, return the gas flow rates to the equivalent of 10 stoich at 200 mA.cm -² and set the current to 800 mA.cm -².