TeslaTo safeguard the future battery supply chain Tesla took in the recent past many stakes in promising companies. Such as the Lithium resource space. For example, Pure Energy Minerals is only one of them.
But, ask yourself this:
To make a company (Tesla) totally dependent on one single supplier (HPQ) can not be considered as a prudent business strategy.
I know everyone will hate me for saying this.
Only those who were ever in a position - involved in such a decision making process - will understand what I'm trying to articulate here.