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GM licenses technology that could also make the batteries much cheaper.
As Nissan and GM prepare to ship flagship electric vehicles, Toyota is taking another road.
The company hopes to develop powerful, lightweight lithium-air batteries.
GM plans to develop batteries with A123 Systems for its new electric vehicle.
The next few years will show whether the batteries in electric cars from GM and Nissan are safe and reliable.
A spinoff from the Rocky Mountain Institute has developed a 100-miles-per-gallon plug-in hybrid.
Advanced biofuels, more-efficient vehicles, and solar power top the most notable energy stories of 2007.
The new Prius is designed so that its battery pack can be swapped out for a plug-in lithium-ion battery.