I have found that Li-ion batteries that have been used vary depending on the car salvaged from. The LEAF battery has the highest failure rate and shortest life span. When buying used there is the possibility that they have been abused or shorted. Afterwards the voltage will rise back to what looks normal but the battery cell is a goner and will not take a good charge above 3.7vdc per cell. Volt, BMW Bosch and Ford Focus seem to be the best. Volt is the easiest to work with, but modules made before 2015 is not recommended.
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