I suspect that if you wanted to build a tesla battery out of these at their retail price point, it would cost you more than the car.
That said, as these are among the first commercially available Graphene Batteries, they should currently enjoy a large profit margin.
Nothing in them makes them inherently much more expensive than common LiFePo batteries. It turns out that Graphene is not all that hard to make.
And they DO charge FAST, compared to normal lithium batteries.
~Easy
Apparently, most graphene batteries still use lithium, with the graphene incorporated into an improved cathode.