that is completely accurate, but that is graphene on its own, if it is manufactored on a substrate (surface of another material), the cost plummets, like around $100 per square centimeter (why thank you wikipedia), which ultimately be where applications come from (at least in my opinion of extremely limited ability in electronics), to build a battery, you need a conductor, an insulator and another conductor, and so on, then a cathode and an anode, all of this is in an acidic solution within a housing and you have the anode and cathode as the outlets as the positive and negative sides of the battery (and this is as far as my understanding goes, although I might have mixed how capacitors and batteries work), I could only speculate that because graphene itself a single layer of atoms, that could ultimately be the limiting factors with the use of an acid, or graphene could be what makes super capacitors able to be built on a huge scale, which could be what replaces batteries in hybrid drive systems (over a battery that wears out from being drained and recharged, a capacitor by design doesn't) or even in electric cars
honestly, it might be more likely that graphene will be the holy grail with semi conductor electronics, or at least in the near future, I can't speculate that much beyond what I have already stated as I don't have experence in this field, also physics magazines have a large price tag on the subscriptions and I don't understand (yet) how the physics and chemistry involved works