I have Jam Hang Up & had problems charging. The thing just would go off even after I charged it overnight. I see that many people complain about the Hang Up not holding a charge, not turning on.
THE SIMPLE SOLUTION:
I went back and looked at Instructions. It is in pictures with no words! I believe they mis-marked the charging port- it is not the one what hold the charging cord. You have to open the covered port and use that to charge the battery. PROBLEM SOLVED!! Jam fix your instructions, they are either wrong, misleading or confusing you clients and costing you. I hope i saved you money and reputation, and help other buyers. I like my Hang UP and my Hang Around.