Here my battery life
4 hours+ SOT with 40% brightness + no power saving mode + 4g mix with Wi-Fi

*stock fw unrooted

bro the answer is one of the below:

If it is an app draining the battery, have a look at what apps that consume most power from the list under "settings" - "power saving"
If u see any particular app that keep showing up in the top 3 u found the culprit. Next would be uninstall the app or find a way to deal with it. If through app setting it still drains battery then Greenify could be your solution here

It also could be a telco coverage issue causing battery drain. If your phone signal fluctuates a lot between 2G-3G-LTE, that will reduce battery life as well. Simple way to fix it is to lock to 3G or 2G, and only enable 2G/3G/LTE when wanna use mobile data

But from past experience, most of the time it is an app related problem

Bro I suggest u look into email sync
Last time my old Samsung phone also got this issue and it was due to stock email app wakelock. I was only pushing 2 email accounts at that time. If u dun mind to get your emails slow a bit u can adjust stock email app background sync timing to be set to maybe once in half an hour or an hour. That would cut down the aggressive background sync

If u still prefer push, I managed to fix it by replacing the stock email app with their respective native apps such as Yahoo Mail, Outlook etc. But the downside is u would need few apps to handle emails instead of all in one

Anyone tried n4 sets from Korea n Vietnam? I feel the phones made in Vietnam feels a bit sluggish compared to made in Korea

Anyone facing the note 4 home button got some feeling of loose. I press it with small pressure it sound like "tada" tiny crack sound like loosing. But sometimes dont have.
Ish

Just send in to replace the home button.

They will examine and replace the faulty parts for you. If possible, within the day can get a replacement.