this: http://www.technologyreview.com/view/424996/why-your-battery-life-is-terrible-in-one-handy-chart/ http://www.technologyreview.com/view/424996/why-your-bat

this: http://www.technologyreview.com/view/424996/why-your-battery-life-is-terrible-in-one-handy-chart/ http://www.technologyreview.com/view/424996/why-your-battery... There hasn't been much improvement in battery energy density over the past 10 years. There are some interesting developments going on promising 3x-30x improvement on li-ion, but none of it has emerged yet. When someone finally cracks this, it will have disruptive effects on mobile computing to electric cars to renewable energy storage and a million other fields.