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In theory, neither of the manufacturers would want to replace the batteries under warrenty b/c they're pretty expensive, but they might have felt compelled to have longer warrenties (than battery life) to overcome consumer uncertainty over battery life.

Anyone have solid info on battery life?

Just been listening to a presentation by ECD (who design the batteries for these cars) which touches on this:

(thanks rspiii - )

It would be commercial disaster to warrant for longer than is realistically possible. But if you listen to the presentation it seems they are still testing to see how long these batteries will last. But it's more than 80 - 100k miles.

Interestingly the presenter then talks of the batteries being used for less demanding uses (stationary power backup) when they have passed the peak performance necessary for vehicles.

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