GSMArena has completed testing the LG G4 and have published all of the results in their review. If people had concerns about the battery life of the LG G4, they were right to do so. Battery life tests bring to light the poor performance of the G4, losing to its own predecessor, the LG G3.
We've compiled battery test results of the LG G4, G3, Galaxy S6, Xperia Z3, One M9, and also the LG G2 and compared them all. The results are poor for the G4.