The Note 4 does not get better battery life then the Plus, it comes close but it isn't as good, this is a fact and has been established in a few reviews and also benchmark testing aswell. This is obvious once you look at the spec sheet, the Note 4 uses a Snapdragon 805 on a 28nm process node which is noticeably more power hungry then the 20nm Apple A8, and it also has to power a Quad HD display and the GPU has to push more pixels, how hard is it for you to see that lol? fanboy's these day's man..
one thing I do give credit to the Note is the rapid charging, that is very convinient and nice and somewhat reduces the fact it has lower battery life
"The battery performance on the Note 4 isn't quite as good as the Galaxy Note 3 then (which lost 13% in the same test), but with day-to-day usage you're unlikely to notice much of a difference."
One of many reviews saying virtually the same thing. And you do realize GSMarena and PhoneArena are associated with each other lol? what a fail..
http://www.tomsguide.com/us/galaxy-note-4-battery-life,news-19770.html
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"Samsung's Galaxy Note phones have a well-deserved reputation for delivering long endurance. The new Galaxy Note 4 looks to keep that streak going, packing a high-capacity 3,200-mAh battery. While good, its runtime isnt best in class.
"On our battery test, which involves continuous surfing over 4G at 150 nits brightness with background data and other radios turned off, the Note 4 lasted 8 hours and 43 minutesWhile the new phablet's staying power is long enough to provide all-day power for most normal users, it's behind several competitors, including the Galaxy S5 and iPhone 6 Plus."
http://www.anandtech.com/show/8613/the-samsung-galaxy-note-4-review/3
aaand Anandtech's review on the Note 4, showing it gets too less battery life then the Plus...
if you want to get taken seriously around here on these forums, I suggest you post with credibility and use reliable sources and reputable sources. One of many reviews and websites saying essentially the same thing as posted above.
/thread
And like I say when does surfing web is the indicator for battery life like in 2 references (anand and tom) you gave? Why dont we use video playback as the only factor for battery life. In this case Note4 will thrash the 6plus.