I threw that cable out, first time I used it got scorching hot really quickly. I have a 5 usb port charger that I throw each.on a separate cable. I hope mine was a bad unit and you don't have the same problem! The BT20's themselves I love, they are now my daily driver paired with the AS10.
Yeah, bad QC or bad luck of the draw? My two-head cable that came with it works normally, for what it’s worth.