It was plain that unveil of the roadster prototype suggest Musk is hiding some battery advance beyond the 7.5%/year charge density improvement using current technology so the Bloomberg folks is right to question specs based upon current battery design. Musk has been very skeptical of battery breakthrough claims in the past. I won't want to bet against him not knowing his stuff. Toyota says they have promising solid state battery tech in development. My guess would be that Tesla already is working with the UTexas design and ahead of Toyota.
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