The head of Panasonic's US EV business (and in charge of working with Tesla at the Nevada Gigafactory), has revealed details about the company's battery cell technology roadmap. Panasonic expects energy density to improve 20% in 5 years, and significant cobalt reductions even sooner. It's interesting to see Tesla continually upgrading its Panasonic lines, and continue building this relationship ... with rumors heating up about Tesla building its own battery cells in house. The Battery Investor Day speculation continues!