If you want the latest on plug ins and their batteries, read “Plug-in Hybrid Electric Cars: How They’ll Solve the Fuel Crunch“:
Efficient, affordable, 110-volt-powered vehicles could be on dealers’ lots within three years–if engineers can get the lithium-ion batteries right. Popular Mechanics unravels the technology and crunches the numbers.
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Any thoughts on Tesla motors claim to have gotten the lithium-ion batteries right? http://www.teslamotors.com/blog2/?p=50