Also, I just did some research on the different Anker batteries! Here's what I found out! I obviously HAVEN'T used a MixPre3/6 yet, but after reading this thread and NUMEROUS different cables and batteries for my MP6, here's my conclusions and opinions!
The Anker batteries ALL differ in their output! They make quite a few different models that output 3A@MAX, but unfortunately the Powercore 20,100 you bought, only supplies 2.4A/per port
If you'd have gotten the Powercore 26,800 or a few of their smaller sizes that output 3A, then I'd bet the farm that you'd be FINE with a SINGLE Anker USB A>C cable from the 3A port on that battery! They make a bunch of different batteries, and only a handful of them have USB A ports that can output 3A. So that said, I will DEFINITELY be buying the Anker batteries that can output 3A@MAX, so that they can RELIABLY supply enough power to my MP6 using a single USB A>C or USB C>C cable! As always, I'll keep yinz updated on all of this once I get my MP6 in hand and try out all of the different cables that I got for it
I'll be buying an Anker USB battery with a 3A@MAX USB A output here soon to test it out with the MP6 and my Anker Powerline USB cables and Adapters! Damn, that's a lot of typing USB
And I also plan on buying the 8xAA Battery tray for my MP6! I don't like how cumbersome and how much bigger the L-Mount Battery Tray is, so I'll be avoiding the L-Series batteries for right now! But I like the extra height that the 8xAA Battery Tray gives the MP6, since it's so damn small