It looks like another breakthrough will help solidify the transition to alternate energy. With the level of energy per pound going up, the transition to energy sources that need a battery for a buffer is made easier. This also helps with the range and efficiency of electric or hybrid cars.

From the article:
"A company based in Berkeley, CA, is developing lightweight, high-energy batteries that can use the surrounding air as a cathode. PolyPlus is partnering with a manufacturing firm to develop single-use lithium metal-air batteries for the government, and it expects these batteries to be on the market within a few years. The company also has rechargeable lithium metal-air batteries in the early stages of development that could eventually power electric vehicles that can go for longer in between charges."

This is an exciting step forward. Check out the related link for the whole article.