Hi,
I have used TQTHL and "Deep Stretch" extended batteries for my earlier lg g3 d855, and now lg g4 H818N.
TQTHL was/is 7700 mah and works well.
Deep Stretch (available only in the U.S.) has ~ 9000 mah, and fits in the same space/cover as TQTHL. However, in lg g3, I have noticed a 3-5 degree...