I suspect this article gets a lot of things wrong, and may be completely incorrect. I am not aware of any reliable information indicating that Tesla is pursuing a battery design as described in this article, but perhaps they are. Tesla Patents Next-Gen Electric Car Battery that Gets 400 Miles on a Single Charge | Inhabitat - Sustainable Design Innovation, Eco Architecture, Green Building Tesla Patents Next-Gen Electric Car Battery that Gets 400 Miles on a Single Charge | Inhabitat - Sustainable Design Innovation, Eco Architecture, Green Building ----
That's interesting. I would expect a metal air battery to be used as a "range extender" rather than it be described as a "hybrid." And you have to replace the battery after you've used it...because you can't "recharge" metal air batteries as the term is used for current EV batteries. Tesla would need a way of installing and removing these batteries...conveniently.
The article is dated Sept of 2013. I remember seeing it then. So old, I doubt there's anything to it.