Don't detract it just retract it. Just search for them and look at everything they do. The look at the margins they get. Them look at their customer list. You're still not convinced after that ?
Ask Tesla! While you're at that it might be beneficial to look up CATL.
Of course, as with Tesla not everything is publicized in easy to digest form for 'securities analysts'. As with Tesla it takes a lot of work to sort the 'wheat from the chaff'.
Neither BYD or CATL are easy to digest. Both have plentiful information if you'll devote the attention.
Note: I neglected to mention the BYD commercial battery production approach, which is very popular with utilities, commercial and residential solutions in markets they serve.
BTW,
@Discoducky , have you checked out all of your questions for Tesla? Who makes their FSD chips? answer: Nvidia until 2019, then Samsung since then, now ones are coming from TSMC.
Chips, OK I'll begin your BYD introduction with them, with the note that they recently decided not to sell it off partially:
byd-semiconductor-to-put-8-inch-auto-chip-line-into-production-next-month