A car battery is made of a box, electrolytes, acids, metals like lead, water and some minerals which create current, a form of energy.
That energy does what it is suppose to light and movement for machines for a certain measured time.
Exactly same a human body works, once electrolytes are done, it stops. Energy zeroes and not fly some where.
All these soul talk are man made, man doesn't want to die for ever, so this is a good thought that soul will live for ever.
Now back to who am I.
You are nothing but a dead battery, soon.