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Just curious, how much does Tesla do R&D for batteries, solar, energy storage, etc.?

For example, as I understand it, Panasonic manufactures the batteries for Tesla vehicles -- does Panasonic do all the R&D for those batteries? Or does Tesla do it and just has Panasonic manufacture to Tesla's specs?

Same question about solar. Did Tesla simply inherit Solar City technology? Or did Tesla invent and develop the solar tiles? (Not sure about who designed/did research for their traditional solar panels).

How about Powerwall and their industrial energy storage solutions?

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