LG G5 might have a battery that you slide in from the bottom like a gun clip

[cdmagurus.com]

LG is said to be using a modular design for the LG G5 that would allow people to take the bottom of the device off in order to remove and insert batteries at will. Here's a look at what it supposedly looks like.

More... (http://phandroid.com/2016/01/13/lg-g5-modular-battery/)