There was a similar product until I accidentally stepped on it. I had this so I could plug the cable into the charger's fast charge port C. When mine broke, I was in dire need of a replacement. I bought this pack of two and two days later it arrived as planned. Now it is connected to my phone. In about three minutes it went from 0 (zero) to about 16%. That is fast! So I think the element works well. [Charging took about 10 or 12 minutes. It's now 50% charged] So my guess is that a cell phone charged with a "fast" charger will go from zero to full in about half an hour. Great, no more waiting for hours.
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