Once I’ve run into a problem with my lovely Plantronics BackBeat Pro.
It decided not to charge with any given cable or power source. It just didn’t react on plugged in a cable, while blinking with red lamp saying that it needs to be charged.
After googling and dancing around it, I’ve found a solution: you need to reset the charging system by doing the following.
Press play/pause button and while holding it plug-in your charging cable.