It seems that whenever I plug my phone in to charge, the battery doesn't go up very much. I'm probably just so used to how my Centro could keep a charge all day with no problem. But I had this thing plugged in for an hour, and didn't use it. When I unplugged it, the battery level did not go up at all. It seems my laptop is not giving it enough charge...but it says it's charging. Has anyone else had this problem?