Quick Questions from a dummy

Gold is reusable like many other commodities
So
What happens when a lithium battery is stuffed-ie is the lithium re usable or does it become junk?
So Lithium is not and endless resource
So if everyone and thing becomes Lithium intensive how long will the Worlds supply last??
I base the last on the fact that if Lithium is spent once the battery is stuffed etc etc etc

Like I said in the heading, questions from a Lithium as a source of power dummy

Was going to do the hole Google thing but thought someone may already know and be able to answer and save my fingers from searching

Oh yes tomorrow is the day we get something