I think I have a problem charging my transmitter for my Phantom 2 Vision +.....When I turn the transmitter on there is only three of the four lights on, so I decided to charge it up to full capacity. I plugged in the usb to the transmitter and the other in into my computer usb, well some time later over an hour I unplugged the transmitter and turned it on and again only three of the four lights are on. Can any one shed some light on this for me...Please!!!!!