Tesla is a battery manufacturer that happens to make cars. Remember, they also make the Powerwall and grid-scale storage. I think the bigger question we should ask ourselves is, "What is a tech company?"
https://www.cnbc.com/2022/09/20/tesla-megapack-battery-caugh...
Grid storage might eventually be a major business for Tesla but I doubt that it will drive huge profits. They don't have any unique sustainable competitive advantage and the customers are extremely price sensitive, so I expect long term profit margins to be low.