Here's my review of the Goal Zero Sherpa 100AC, which is compact, weighs 2 pounds and charges charges the Phantom 4 batteries without a hiccup. This also compares the Sherpa100AC to similar power banks.
I was not compensated in any way for this review or posting.
The Goal Zero Sherpa 110AC...
I have 5 batteries but they do me no good if the controller dies. What can I use to charge the controller while I'm away from civilization? The controller has no USB input so I can't use a regular power bank. Thanks.