Fast chargers for electric vehicles are already available, but their connectors are largely incompatible. As standards wars go, the debate over which will become the industry leader is a version of the battle between Betamax and VHS.

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The story of the 2012 Toyota RAV4 EV represents the melding of two corporate cultures — one a staid but successful Japanese behemoth, the other, Tesla, the disruptive California start-up — into a single machine.

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