From what I can figure from teardown video’s Anker is using 18650 cells in their larger powerbanks.
Does anyone know they have plans to start using the superior 21700 (21-70) cells.
While only slightly larger those cells offer 40% more capacity.
The slightly smaller 20700 cells offer 31% more
capacity, but I think those cells won’t really make it, because 21700 is the standard
in electric cars (Tesla)
That means more research, which means it is to
be expected capacity will increase more in those cells.
That’s why the bigger 26650 performs much worse
when comparing on volume. And the niche market 32650 does even worse.