I have the LG G5 and love the ability to swap batteries when necessary. As an illustrative example, it proved invaluable during the Pokemon GO craze where I could swap batteries on the go, without the need for a charger...

I also have a 200GB microSD card in it that has not worked much (storing photos I take with the phone's camera) since I bought it. I'm not sure why but it does work with files already on it.

You could always buy more batteries and charging cradles so that when you're on the go, you won't run out.