Welcome to the other side brother, explore Jehu's youtube and educate yourself.
https://www.youtube.com/user/jehugarcia 


"Tesla Batteries" could pertain to a variety of differently spec Lithium Ion cells, most likely your referencing the 18650
https://www.google.com/search?q=lithion+18650&rlz=1C5CHFA_enUS717US717&oq=lithion+18650&aqs=chrome..69i57j0l5.5735j1j8&sourceid=chrome&ie=UTF-8