I wanted to get an extended battery for my note 4 , but i only use shock resistant holster cases (because of work enviroment) so this was not feasible. While searching around I found this:
Does zero lemon make quality products, it looks well built in the picture they provide, has anybody owned a zero lemon product? The only downside is no built in screen protector (which I prefer) But I could get a nice tempered glass screen protector to go with it. Also another concern is that there is no plastic framework that snaps over the TPU body of the case, this is usually what keeps the TPU material in place.
if you want ridiculous battery life, you wont regret it.
i own a note 3 with a zero lemon extended case, and the battery life is ridiculous. it is a bit clumsy,but you can easily change it out for the standard battery and case if you don't need it. the case is a few pieces, and the rubber shell is captivated by 2 nubs on either side as well as a lip that goes the entire length. the outer shell is held down pretty well on my note 3 version, so i would think they built the note 4 version the same way.
i had a tempered glass screen cover, and it doesnt affect the way the ergonomics of the phone, but it will save the screen by essentially making it a laminate, in which my cover did. i actually removed the screen cover and shortly after i cracked my display. adding the glass screen cover makes impacts that hit the display perpendicular much less likely to cause damage, especially rare things like cracking JUST the display and nothing else -_-