"What is more important after you focused on the Anker aspect is your device. You have far more control of what those mAh does in your choice of device."
While I agree with that, with all respect, that's not what I asked.
No matter if a powerbank has an efficiency of 95% or 59%, things like less screen brightness can help a lot. So consider that done.
Yes 2x 10000 is an option too. But in my case a more expensive option without any advantage because I already own a smaller powerbank.
Most models of any brand, including Anker , are off my list because I really want faster charging times. (2x 2A input).
EasyAcc speeds that up even more because they use 2A + QC instead of 2A + 2A
Anyway, thanks for your answers. You just don't have the answer I'm looking for. That's no meant as an insult because I don't know either. I do know that the efficiency of some Anker powerbanks was on their site in the past.
Final question, does the PowerCore II 20000 support pass through charging?
Anyway PowerCore II 20000 was high on my list, but now I have to act fast because it's one of the discounted summer sale products