What happened?
My laptop somewhere along the way develop a poor connection between port and the charger barrel. So it caused a lot of resistance (basically turning it into a resistor) when setting my laptop to high performance (the CPU drawed around 20-30 watts). I kept doing this unknown willingly with three chargers that all had their barrel burned or at least damaged. @Puraw said the charger should be 5.5mm x 1.7mm which atleast two of them was, but still they got damaged.
What now?
I intend to replace the charging port by myself, since it looks as easy as replacing a battery, but my only problem is how do I remove the port itself (the metal part) since it looks firmly attached, so if anyone can teach me I would be very grateful.
Misc. question
Could a faulty or old battery also be the cause?