Haha yes for this trip to sux flags I'd go with the batteries and note 4. Haha esp since you can't get it in time.
Below is the one I have which has been great. It absolutely says "fast charger connected" when I connect, and does charge fast. These external quick chargers are game changers! They finally made me feel ok with not having removable batteries.
I've seen the same exact shape/specs/etc as the one I got below under several different brands though. I'll bet they're all from the same factory on China.. But it's been working great!
Don't forget about the Samsung official external quick charge batteries too!
[Qualcomm Certified] Aukey Quick Charge 2.0 10400mAh Portable External Battery Fast Charger (16.2W / 5V 9V 12V Supported, Quick Charge Input and Output) - Silver
https://www.amazon.com/dp/B00UBDI7E...ag=hawk-future-20&ascsubtag=UUacUvbUpU4625534
https://forums.androidcentral.com/e...s-accessories%2FEB-PN920USEGUS&token=rGPyDHUc
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