I have a question regarding ESD.
My body can be electrically charged, for example if I have walked on carpets. In such a case if I touch the earth pin of one of my household outlets, an ESD will happen and the excess of charges within my body will transit to the earth.
If, instead of touching the earth of the outlet, I touch a pin of a PCB which is battery-powered and has no connection to earth, will an ESD happen? And if I touch any metallic object which has no connection to earth?
If so, why? Shouldn't there be a closed-circuit for current to flow between two objects?