Much of the modern world depends upon batteries. We have more and more portable gadgets that require batteries for the electrical power they consume. (Since requiring a wall-plug would make them significantly less portable.) Good batteries could also free us from the tyranny of gasoline, having cars powered by electricity made by whatever fuel source is cheapest this week.
Discovery News is reporting that a new battery technology would make batteries with ten times the capacity of the previous lithium-ion batteries, thus allowing your gadgets to run ten times as long. Hallelujah.
The new discovery isn't all rainbows and sunshine, though. It's difficult and expensive, involving carbon nanotubes laid exactly-so, so these miracle batteries would cost an order of magnitude more than the ones you have now. You may gain huge benefits, but you'll pay through the nose to achieve them. At least until the technology improves, and the batteries get so commonplace, that they get cheaper and cheaper.
Still, one step closer to decent electric cars, laptops that run for days at a time, and pacemakers that require much less maintenance. Everybody wins.
(Also, this is post #500. Woot.)