Like an idiot I attempted to charge a separate laptop battery by taking a usb cord that I cut and placing the positive wire to the positive side of the battery and negative wire to the negative side of the battery. Once I plugged the usb into my usb port of my HP envy it instantly killed all power to the HP and won't indicate any power is getting to the HP now and in addition to this I tried accessing the hard drive through another laptop and it shows that the hard drive is empty. I realized that what I had done caused the power loss to my HP so my questions are why would my attempt at trying to charge that battery cause my hp to crash? And why would it have erased my hard drive? And is there a way to retrieve the information that was on my hard drive?