Hi,
As you can see my battery life is about the same as yours. I don't know what your use patterns are but my phone is used very lightly. Location services generally off, bluetooth off, S-Pen features that use juice are off. The device functions more like a dumb phone with a touch screen as a result of all the things I have to turn off just to get through a day and be able to make/receive a call. I must've had dreams of sugar plums in my head because it honestly never dawned on me that the only way to get a day's use out of this device is to shut down everything that makes it what it is, rather than a dumb phone with a touch screen. The problem is definitely caused largely by the cell radio standby. I have a Moto Droid Razr Maxx and it is not a piece of junk, in fact it has a lot of the features of this device but no S-PEN. Last I checked the phone had been on 7 days and I still had 62% battery remaining. That is with wifi on, power savers off, all my apps immediately accessible, etc. The cellular radio standby DID NOT EVEN REGISTER it used so little juice. Meanwhile the Note 5 uses 12-18% of the total battery (Meaning that if it is the only process running, the battery will be drained to 88%-82% for about 12-14 hours of almost all standby. My moto gets AT LEAST 7x the battery life. Samsung's tablets are great (I have 2 and had 3). The battery life to light up this big 12.2" screen is amazing - sometimes SOT exceeds 10 hrs (of course with the brightness way down between 10-15% which gives plenty of light). The battery is 9500 maH where the Note 5 is 3000 maH. The big tablet has more than 3x the screen real estate and both wifi and bluetooth are running all the time because of my keyboard/case. It lasts a solid 12 hours continuous heavy use with the screen on most of that time. I eked out 16 hours of use once but I generally charge it every other day. I really wonder why Google, Samsung and other manufacturers are so hell bent on forcing the non-removable battery (so you could replace it with a spare), and microsd cards. It seems to me my data is more secure when I remove it form the device than when I leave it in the device, so I don't buy the security spiel about why microSD write permissions were crippled in KitKat. I know I will get labeled a conspiracy theorist but I don't care. It's a heck of a lot easier for Samsung, the ABC agencies, et al, to access your data if there is always a battery in the phone and the onboard storage is the ONLY storage.
The thing that irks me is that an $800+ device has to be hobbled in order to get a full day of use, and that means not using a lot of its superb features. Frankly, I do not believe Samsung does not have access to battery technology that could last days because Moto does and Moto is frequently way behind the curve. I would rather have a plastic back and device that won't leave me high and dry over a Gorilla Glass 4 back that is prone to shatter, cannot be user serviced, and does not protect from moisture damage as the Note 4 did (up to 3' underwater). That is regressive. I wish I had voted with my $$ and gotten a Moto X Style. Granted, it does not have a lot of the bells and whistles of the note but my sister went from LG to Samsung to Moto X Style and loves it. As the French say "Chaqu'un son gout" or to each his own taste. Unless Samsung addresses this battery issue my next Gout will be anything but. Happy holidays to all! dblhelixman