Tesla’s battery day has come and gone, leaving many experts scratching their heads over what they saw. Instead of the anticipated “million mile” battery we got a series of plans: a plan to manufacture Tesla’s own battery; a plan to process the raw materials; even a plan to mine its own lithium…

Investors were underwhelmed with battery day as well. Tesla’s stock price began to dip as soon as Musk said that some of the innovations showcased at the event were “close to working” and some were three years away from fruition.

The vision Musk outlined on battery day was less about reimagining batteries, and more about reimagining manufacturing, according to Shashank Sripad, a battery researcher at Carnegie Mellon University.

“There were no big surprises in battery materials or design, but quite a few interesting things in manufacturing and engineering,” Sripad said. “It was as much a manufacturing day as it was a battery day.”
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