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It likely wouldn't be a big bang replace job, just a few cells / year. That won't do much for the total cost of ownership, but would avoid bursts. Also, I don't know what that would cost, nor how much the alternative solutions currently in place cost. I'm sure Tesla will spin it so that their TCO looks a lot more attractive than their competitors.

Also, who knows where battery technology might be in ten years; given that these are modular batteries, they could replace them over time with higher capacity ones.

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