That would imply a doubling every nine to ten years. A link from an earlier comment... http://www.akbars.net/images/battery%20energy%20density.png http://www.

That would imply a doubling every nine to ten years. A link from an earlier comment... http://www.akbars.net/images/battery%20energy%20density.png http://www.akbars.net/images/battery%20energy%20density.png ... would imply that this is overoptimistic by at least 2x.