I recently have messed up one of my USB ports on my laptop...the weight of the charger cable and battery plugged in has the black little plastic peice slipped off and now the metal prongs inside USB are exposed...I tried slipping the black peice back over prongs and it kept falling back out and now it's stuck inside my battery charger wire usb connect. Even with it stuck in there I tried putting it back into the USB slot and unless I move and put tension on the cable a certain way that it will make contact it will not charge my battery. Anyways from now on I am sticking with the wall to charge my batts anymore...