So the plug in is o e with two(-&+)holes and my laptop takes the round cylinder with small pin in center. My situation does not allow for replacement for some time. I am knowledgeable with electronics but looking for diy advice. I have many extra adapters and wire to work with. Some need to apply the correct + & - to the correct positions and am seeking information with further knowledge to make sure I'm not missing something. Should I run power to the battery or to the power port. I am thinking the usb port wouldn't be safe for the laptop pushing 19 volts in. Any suggestions?