http://feeds.sciencedaily.com/~r/sciencedaily/~3/sFfBPrSTxfM/150330134602.htm

In the first study of its kind, scientists quantitatively show that electric vehicles will meet the daily travel needs of drivers longer than commonly assumed. They found that batteries that have lost 20 percent of their originally rated energy storage capacity can still meet the daily travel needs of more than 85 percent of US drivers.

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