Can you summarize your test results (browsing and video play) for g flex.
SUMMARY: Browsing life is typical 8-10 hours for me on the sites that I frequent. Camera life, I think it can easily lose 20-30% per hour due to all the factors involved. Video and ebook reading it's basically unkillable so far, I always run out of time on the weekend and need to charge it for Monday. I leave all the radios on, but my only 24/7 messaging is Hangouts...the rest are logged out and shut down unless I need to use them. Well, eM@il and GMail set up normally and constantly ready. GMail is vastly inferior for sending attachments by the way.
I have never gotten less than seven hours screen time in a 24hr period, or less than five in 48. It's better than my 7.0 LTE tablet. I only enable Knockon if it's going to be flat on a desk for hours, saves a few % per day leaving it off. I don't Airplane overnight.
If you read ebooks in grey-on-black night mode or browse dark themed sites with something like Opera Mini, you should get 15-20 hours from a full charge. Videos I strongly agree with the wide 12-20 hour range, longer play for dark and SD; shorter for bright and FHD. Hitting bright sites in a rich media browser at high brightness over 4G, I think you'd probably get five hours in a charge. These are not lab numbers tho. I am on Sprint, ATT models should do better if locked in 3g only.
TL;DR:
I haven't done a lot of rigorous bench testing but over the last couple weeks I've been working toward a balanced video test and reading test that I can semi automate....since the endurance is sharply related to picture luma values.
Er, that is to say OLED screens use power for each lit subpixel. BLACK being about zero and WHITE being max consumption. Pure colors only light Red, Green or Blue and are also power efficient if you can achieve them.
So if one site uses very bright footage like Big Buck Bunny and another uses darker fare like Elephant's Dream, it will have a major impact on battery endurance for the video test. 480p, 720p or 1080p test clips also make a difference, and whether the test was loaded from storage or streamed over wifi ala Netflix. Unless whites were calibrated toward a target value in nits, there again is reduced value in the comparison between models. My screen calibrator broke two years ago and I have not replaced it :/ not enough demand.
As we close in on the end of OLED, AMOLED, P-OLED catching up to IPS color reproduction and frame rates, more and more phones/tablets will see their screen power consumption drop from 50-70% down to 20-35% in a normal day....unless SoC power consumption suddenly drops by half in the near future.
If silver based batteries are realized, power density roughly doubles compared to lithium polymer? So either an even thinner phone or a better endurance or performance. Sammy needs to get off its chair and ship a phone with a new Exynos, 64GB EVO-based SSD and a silver battery....that would be enough to hit low-end ultrabook territory.