You have to drill or cut into the skull for plenty of medical procedures. I don’t think getting a dime sized piece of skull removed at the crown of your head means your head explodes when you hit it on something.

As for the charging thing, there are plenty of solutions. Wear some kind of headband for one.

Ah see, the problem is you were looking in /sdcard0/ which of course, refers to your internal storage and not your SD card which is probably called /0xgg0gdjdsjgg/ or something.