Good article:
http://www.msnbc.msn.com/id/11812910/
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BusinessWeek magazine reports that when the U.S. Department of Energy investigated hybrid batteries, it stopped its tests “when the capacity remained almost like new — after 160,000 miles.”
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Quote:
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Toyota tells me that some of the original Prius models now have battery packs that have gone more than 300,000 miles.
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There is also some stuff in the article about battery disposal. It's nice to see this topic is getting some decent exposure.