I charge my Note 4 to when it's at 100% prior to sleep. I turn on battery savings which includes; limiting apps in the background and the greyscale mode. After 6-8 hours of sleep, I usually lose 4% which imo is great.
".... [T-Mobile]→ Samsung ''charcoal" black 32 gigs onboard storage plus a 64-bit Samsung SD card...."
When my note 3 was new and I was conditioning the battery, I had one cycle in which it just slept for the entire discharge time. Over 4 days, with a few peeks at the screen. If the CPU is idling at a low frequency, and the rest of the phone is asleep, almost no current is being drawn. Not just now. We had phones 10 years ago that could idle for 5 days or more. Make 1 call and you've used more charge than a whole day of idling.
I've been very impressed with standby times. As long as the phone is able to go into a deep sleep (ex. minimal wake locks; Awake graph should match up very closely to screen on. See screenshot below), it barely sips any battery. Overall, I'm averaging around half a percent drop (or less) per hour on standby (no power saving mode).
My phone sat overnight for 8 hours last night from about 100% charge. It lost 15% charge.
Then, later today it sat (with zero use from me) for about 5 hours and lost 8% of it's charge.
This is in normal mode, not power saving mode. I'm curious now how power saving mode or ultra power saving mode might have helped. Guess I'll try that tonight.
I was able to perfect my old GS3 to stay at 100% while I slept, but I haven't been so anal with the Note 4. I turned off all the apps I don't use (Mostly google stuff) and I lose about 1 to 2 percent over night while sleeping (8 hours). I never turn off location, bluetooth, or wifi.
The battery life on my phone is amazing! Almost 2 full days, with around 5 1/2 hours of screen on time. Admittedly, it has been in airplane quite a bit (I have been working in. A building with zero signal) the last two days. But still, my old S4 wouldn't come any where near this. I'm happy.
Here's a better example of my standby time. 14% battery used over 39 hours of very light use (total 30 minutes screen on time) which ends being about .35% used per hour.