Among the many changes, the new rules would require batteries in consumer devices like smartphones to be easily removable and replaceable. That's far from the case today...
I’d imagine you’d have a hard time using USB power banks to form a battery that resembles (for example) a MacBook Air battery:
Considering most power banks use 18650 cells or similar (but even if they are thinner), I can’t really see how you’d form a battery pack that fills the space effectively on most notebooks anyway.
It’s also a lot of work finding the correct cells to use (form and size wise), ordering them, if it’s in a power bank prying that apart, desoldering the old and soldering in the new cells. >= 99% of all people would purchase complete, fitting battery packs for their model of laptop.
I’d imagine you’d have a hard time using USB power banks to form a battery that resembles (for example) a MacBook Air battery:
Considering most power banks use 18650 cells or similar (but even if they are thinner), I can’t really see how you’d form a battery pack that fills the space effectively on most notebooks anyway.
It’s also a lot of work finding the correct cells to use (form and size wise), ordering them, if it’s in a power bank prying that apart, desoldering the old and soldering in the new cells. >= 99% of all people would purchase complete, fitting battery packs for their model of laptop.