I see your data coverage is bad. Thats bad for battery.

i got like 3hr20mins++ SOT until 15%
with around 1 day battery life
midnight 1am-6.50am aeroplane mode

Wow great.

Must be the screen lah... QHD really makan battery :S

I think quite sure is QHD. I've tried everything the best i got is 5h+ SOT. Probably additional to that are those touchwiz services which cant be disabled

Note 4 has the best battery life according to a test done by Tech Columnist

Order in which the phones' batteries died:
1. iPhone 5S
2. iPhone 6
3. HTC One M8
4. iPhone 6 Plus
5. Huawei Mate 7
6. Huawei Vodaphone
7. Samsung Galaxy S5
8. Samsung Galaxy Note4 (SM-N910G Quad-core 2.7 GHz Krait 450C)

http://aca.ninemsn.com.au/article/8932913/...ave-your-sanity

I strongly disagree with this test report. It doesn't even state under what conditions was the phones tested
My personal experience with 80% on internet stuffs ( browsing, email, RSS, whatsapp, tweeter), ebooks n some YouTube videos

Note 4 : SOT 6-7 hours
Mate 7 : SOT 9-10 hours
Ip6+ : usage 11-12 hours

How to mod ip6 ? Is not android!!
Out of box since day one till now battery life is excellent. Some users even reported 12-14 hours
I need not do any tweaks. In standby mode , battery level  literally doesn't drop at all.
The only impressive stuff of ip6+ vs Note4
Those here who owns both ip6+ ( not ip6) n Note4 will confirm ip6+ battery is way much better than Note4
With similar usage I only need to charge my ip6+ once every 2+ days while Note4 I'd need to charge it every day

I wont say Note 4 has crappy battery life - what do you expect from a phone with 2K display ? 6-7 hours SOT for me is already very good. My previous 2K display phone Find 7 only 3-3.5 hours SOT only
But Note 4 personally I feel is a way much better and functional phone vs ip6+. Anyway ip6+ file restrictive system is just unsuitable for me. It is so troublesome to locate files, manage files on phone itself , emailing with multiple attachments and very poor sharing info from FB, RSS, Tweeter, Newsfeed. I had given it up and will pass it down to one of my family members for general usage

Buy a spare battery

As reported in xda, all note 4 use sony sensor. old version of firmware is still showing isocell sensor in isp version.  New version firmware already clean up unused  kernel code and show proper isp version which is sony sensor.
Note 4 battery life may not be the best but it is good enough. Based on my own experience/usage pattern, note 4 battery life is as good as note 3 if not better. Besides that,  note 4 sport a QHD screen which is almost double the resolution vs iphone 6 plus or  note 3.

Hmm, confirm that snapdragon is better than Exynos? I read many websites saying Exynos is faster and some say is blazing fast?!?

Is it normal for 4 hour SOT from 100% to 10%?
Although I spend all my time on Reddit.