https://electrek.co/2020/02/26/tesla-secret-roadrunner-project-battery-production-massive-scale/

Now sources have told Electrek that the secret project is called “Roadrunner,” and it will aim to achieve mass production of a new battery cell that will be more energy-dense and cheaper.

The cells are using technologies developed by Tesla’s internal teams, including work from its research lab in Canada led by Jeff Dahn, and new technologies recently acquired through the acquisition of Maxwell.