The A/C adapter on my laptop is loose, and my laptop will go off of A/C power, and run on batteries. That is fine if I am using the computer, as I can wiggle the plug on the back a little bit, and things are fine. But if I am running a process overnight, the laptop will hibernate when the battery gets too low. Is there a way I can charge my laptop battery through the USB/firewire port? I have done a google search, but have not come back with anything yet.