Reasonable price but you have to throw in the efficiency of the charger.
Meaning: Coal Power is cheap, even when stored in a battery.
Something to consider...
The current replacement cost of the Volt battery is $8000.
The battery comes with an eight year / 100,000 mile warranty.
Meaning: Coal Power is cheap, even when stored in a battery.
~~~~~~~~~~~~~~~~~~~~~~
The cheapest energy on the planet is a coal fired ultra super critical boiler. If they ever do get thorium power plants going, thorim will beat uranium power but not coal for cost per kWh. But thorium will potentially beat coal for size, portability, and time between fuel up. We could end up with thorium powered trains and ships some day.
What’s holding back battery powered cars is the time to charge them, price of the battery, limited energy density, and size/weight of the battery. As you have just figured out on your own, electric is the way to go if they could just get the battery technology up to snuff.
Really good batteries will change the world more profoundly than the steam engine did.