If this can extend the cycles to 100,000 (from the article), this brings it the cost down dramatically. Using a conservative half of 100k:<p>(50,000 x 5.4kWh) = 270,000kWh<p>$3300 &#x2F; 270,000kWh = 1.2¢&#x2F;kWh, more than a factor of 10!