Robotics · 9 November 2026 · 3 min read
Musk says a 40 kilowatt-hour Cybercab is coming. He did not say when
On 7 November Elon Musk wrote that efficiency improvements will allow a 40 kilowatt-hour pack, and that Tesla will also build the car in liquid silver. He named no date, no range and no present pack size. A sentence on X is not a car off the line.
Elon Musk wrote on 7 November that “there are efficiency improvements coming that will allow for a 40kWh Cybercab pack,” and that “we will make this in liquid silver, so the colors are not too monotonous.” Coming is not a date. He did not say what the efficiency change is, what range a smaller pack would give, or what the pack in the car is today. A later reader can do the arithmetic against a guessed present size. He did not.
The same post is mostly about people, not cells. Musk wrote that there are few enough engineers to go round, and that keeping a Cybertruck line, supply chain and engineering team would take the factory space he wants for Cybercab. That is a priority. It is not a count of cars, and it is not a cell contract. The line tour earlier in the month described 4680 cells potted in modules, so a failed module could be swapped. A module is not a kilowatt-hour, and that tour did not put 40 on the pack either.