I bought four or five of these cables because they were good value for money. They worked for most purposes I've tried, including data transfer and charging. However, when I connect the 30W USB-C Car Charger (https://www.amazon.com/gp/product/B08G1MS6JW) to the NEXPOW Jump Starter Power Bank (https://www.amazon.com/gp/ Product/B082ZZ2W14), will not charge with this cable! If you replace the cable with another USB-C cable, charging will begin. I tried a few other cables, including one that measures voltage and current (and showed 9V and 1.7A flow). The defective cable is model JUCX01, serial number CQ1A1609002044.