I wish more felt this way.
I think that more do feel this way, is just in a forum you'll hear far more complaints than people who are happy.
It is the same on every forum here at AC including the G4 forum.
But when it comes to battery life in general, screen brightness has a huge effect on battery life. For example, if two different phones are placed on auto brightness (such as the S6 and the G4), you can get a good idea of what the battery life will be on both phones.
BUT, that doesn't mean that both phones are using the same brightness levels as each other, and one can be far brighter than the other especially outdoors. (example: outdoors, the G4 has a max brightness of only 470 nits. while the S6 has around 560 nits normally and will boost it all the way to 720 nits in ultra bright sunlight. This alone will have a huge effect on both usability and battery life.)
As a result, while I also have another new phone (Zenfone 2) with a much larger battery then what is in the S6, battery life is only the same "if" I use them both at the same percentage levels of brightness. But if I use them both at the same levels of brightness in nits, then the S6 wins by at least a good hour of screen on time if not more. (I use the zf2 as an example because it has the same size battery and almost the same max brightness as the G4)
This is why on the G4 it may win on battery life against the S6 when testing fully on auto brightness. But usability at such brightness levels are drastically different to the point that in ultra bright light the G4 may be almost unusable, while in the S6 the battery might drain fast, but you won't get any complaints about usability in said bright light.
I personally think that the article in question is a great read and fully agree with it based on my limited use and testing on said phones. You'll never get results to match with every test, but the conclusions made at the end I fully agree with. The S6 is a great phone with fantastic battery life. Maybe not the best, but definitely competitive compared to the competition, and all on a smaller battery.
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