[Sprint  Galaxy Note 4 Q&A, Help & Troubleshooting] died4u525:
I'm not bragging but I'm getting excellent battery life. Couldn't be happier with it. I'm not rooted, yet. Most days I'm getting 8-9 hours of screen on with what I consider to be moderate to heavy usage and 18-22 hours between charges so it is possible and I'm not turning everything off to get it. I'm using my phone the way I want to.

I text and use WhatsApp. Lots of XDA and YouTube. I play some games, though usually not ones that really tax the phone. Constantly looking at Business Calendar Pro. Using the finger scanner to unlock the phone frequently. Using the pedometer, the SpO2 sensor sometimes. Connections Optimizer is on. I leave WiFi on all the time whether I'm connected or not because I use it to trigger my Tasker profiles though I am connected to WiFi almost all the time most days. Brightness is turned almost all the way down when I'm home which is most of the time and when I'm out I have auto-brightness on. No Bluetooth. No NFC. Mobile data off when I'm home on WiFi. I use Greenify to hibernate apps like Facebook but since I'm not yet rooted it doesn't do it automatically. I hit the hibernation widget when I think of it which is only occasionally.

Anyway I'm not sure why I get such great battery life and others are having so much trouble. One thing I probably do differently than most people is something I learned to do on my S3. I noticed when I first got it that if I unplugged it soon after it hit 100% charged the charge would drop somewhat quickly. I've been using Battery Monitor Widget for years so I started paying more attention to it and found that even after the phone said it was 100% charged and I should unplug it, it was still charging at a decent rate. I started leaving it plugged in until it dropped to receiving 1-2 mA. After doing that I noticed a significant improvement in battery life. I got a ZeroLemon extended battery for the S3 and continued charging it the same way. This worked especially well with the ZeroLemon and I actually found it to be extremely necessary because if I didn't let it charge that extra time the battery would lose 15% in about 10-15 minutes, screen on or off!

I tested unplugging the Note 4 soon after it hit 100% when I first got it and the charge dropped somewhat quickly. Switched to my old go to method of letting it charge until it says it's only getting 2mA and I started regularly getting 7.5-9 hours of screen on. I don't believe this to be a placebo effect because it worked on the S3 with the stock battery and the ZeroLemon and now the Note 4 stock battery. It works for me! Anyone having problems with battery life might want to try it. For my Note 4, this usually means charging it for about 1 hour and 40 minutes after it hits 100%. I realize a lot of people may not have the time to do that.

Oh and I also noticed that if the phone is left plugged in for hours after it hits 100%, such as charging overnight or even just charging for a few hours after hitting 100%, the charge drops fairly quickly so there seems to be a sweet spot, IMO. I charge it just about an hour and 40 minutes after it hits 100% and it does great.

Apologies for the ridiculous length of this post. LOL Hope it helps someone!

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