I hope you don't take my reply as a criticism, direct or otherwise. I was only expanding on the calculation and offering some broader context.B.Goode wrote: ↑Fri Mar 29, 2019 10:48 amHaving been directly criticized twice for my reply, can point out again that the OP only provided two "facts' as a the basis for their question:
i have a raspberry pi 3 b+ and i have a 20100 mah external battery
I tried to indicate, perhaps too gently, that a reliable reply could not be provided from those supposed 'facts'.
My tl;dr summary wasYour experience with the battery in question and with the RPi running its anticipated workload is the only thing that matters.
[ETA] I see the posts you are referring to now.
You are quite right in pointing out the limitations of calculations from limited data and the importance of real world tests.