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With the increased pervasiveness of Lithium-ion batteries, there is growingconcern for the amount of retired batteries that will be entering the wastestream. Although these batteries no longer meet the demands of their firstapplication, many still have a significant portion of their initial capacityremaining for use in secondary applications. Yet, direct repurposing isgenerally not possible and each cell in a battery must be evaluated, increasingthe cost of the repurposed packs due to the time intensive screening process.In this paper, a rapid assessment of the internal resistance of a cell isproposed. First, this method of measuring the resistance is completed on cellsfrom twelve retired battery packs and one fresh pack using a hybrid pulse powercharacterization (HPPC) test as a benchmark for the analysis. Results fromthese tests show relatively constant resistance measurements across mid to highterminal voltages, allowing this metric to be independent of state of charge(SOC). Then, the relation between internal resistance and capacity across thevarious packs is discussed. Initial experimental results from this study show acorrelation between internal resistance and capacity which can be approximatedwith a linear fit, suggesting internal resistance measurements taken above athreshold cell terminal voltage may be a suitable initial screening metric forthe capacity of retired cells without knowledge of the SOC.

A Fast Diagnostic to Inform Screening of Discarded or Retired Batteries