The cells inside a Tesla S are off-the-shelf Panasonic catalog parts and are identical to parts found in some laptops (and flashlights, and so forth). Tesla's contributions are entirely in the controlling electronics, integration, cooling, etc.
[1]: https://electrek.co/2017/05/04/tesla-battery-researcher-chem...
The "advanced chemistry" that Tesla moved to after a year of S production was a SiO-doped anode, exactly the difference between the B and BF part numbers from Panasonic-Sanyo. The cells weigh a gram less. This makes the charge density appear higher when the denominator is in terms of mass.
Tesla has done a wonderful job of selling their brand and convincing people that their batteries are other than off-the-shelf technology. In reality the same chemistry is available to anyone who calls up Panasonic and orders a hundred million batteries.