I have a Sony laptop with a relatively new battery that was working fine before. But within the past few days it has stopped holding a charge, maybe? Here is what's going on, I have the AC adapter plugged in to charge the battery, the icon on the toolbar says it is charging and the percentage is going up. But when I unplug the AC adapter the computer shuts off. I turn the computer back on and the battery is at 0% and says it is charging again. Also, the battery and underneath the laptop gets very hot, in places where it was not before this has started. What is happening?