In that video, they put a metal that connect to 3 thing: 2 horizontal pins at the back of the phone, the negative and positive of the internal battery, the negative and positive of the external one (inside the case). And I think that the phone can recognize them (or the phone will use both of them by someway??)
So my question is how can it work? Anyone can explant for me please?
And what is the function of 2 horizontal pins of this phone? What is it doing? I know 3 vertical pins ia for wireless charging or for s-view.