Which Custom Kernel Offers the Best Battery Life? - OnePlus 3T Questions & Answers

Ever since I updated my rooted OnePlus 3T to the latest Oreo Beta 19 update, my battery life has taken a huge hit! I no longer get about 6 hours of SOT. Therefore, I decided to flash Franco Kernel. However, the battery life continues to have the same short life span that I had running the stock kernel. Until OnePlus addresses this issue, I am asking everyone to please help me, along with the rest of the forum community who is having this issue, to please find a kernel that can contribute greatly with extending my battery life. If at all possible, please post a screenshot of your battery life, along with the custom kernel currently on your OnePlus 3T. (Note: Before you ask me, I simply would like to say that I DO NOT have any social media apps installed on my phone, which we all know contributes greatly to battery loss since they like to run in the background.)
Thank you in advance for your cooperation.

Battery life will vary from device to device, depending on the usage of the phone, the efficiency of the ROM on handling Wakelocks and more.
Most custom Kernels are all the same when it comes to battery efficiency and hardware interaction/communication.
I really don't think OnePlus should address any issue as it looks like the issue only persists on your device. I've read many posts about how good the life is on the recent Open Beta's based on Oreo, on the Stock Kernel.
If you don't have any Social Media apps, you must be having other User apps. You can check your Wakelocks and see how your device is woken and how CPU usage is taken up. Kernels won't do you any good if you have unnecessary Wakelocks.
Please try a clean flash without any restoration of data. If that does not fix your issue, I'd say you have a bad battery.
Cheers!

I can recommend this:
https://forum.xda-developers.com/oneplus-3/how-to/advanced-interactive-governor-tweaks-t3476589

Related

GALAXY Note: Battery life is so less. ?? (Please Help)

Hi everyone. My battery life is really sucks. I bought my item two days ago. It is new. And I upgrade my version and baseband , kernel and build version like below :
N70000XXLB2
2.6.35.7-N7000XXLC1-CL1003701 [email protected]#2
GINGERBREAD.XXLC1
I think that this version xxlc1 is last version but I wonder how is my kernel version ?
Battery life is very bad.
Moreover Charging lasts so long. 3 -4 hours sometimes.
PLEASE Help me! please
depends in the usage, rom, kernel, settings etc you are using.
lrcquest said:
depends in the usage, rom, kernel, settings etc you are using.
Click to expand...
Click to collapse
when i see some kind of usage experiences, I am so jealous. How they use this much ? HOW. I only use wifi and radio.
Hi,
What is your battery life on the Note? Does it last a day even two?. If it does, then that is pretty much normal. You whine on a phone that you just use for only 2 days? Stop whining and complaining. You havent have had utilize the full charge and recharge cycles of your battery and now your whining already.. Man, give your Note a week or two and your battery life will be okay.
Hmm.. Is this the first time you use an android device? What phone where you using.before? If you we're using a non android device e.g. Symbian or etc. Then my reaction to your complains (of your Note) is justifiable. Symbian for the fact has always been known to be very good or decent in terms of battery life.
Now android OS, is known throughout (irregardless what smartphone/tablet you have) to have the AOS bug. It is a bug where there's some sort of a battery leak and hencefort most android users tend to root their phones so that they can stop background stock applications from running in the background. The births of custom ROMS and Kernels have given some tremendous wonders also especially on phone's UI and more so on battery management.
Again. Stop complaining and go down root your phone and install battery saving apps or custom ROMs. It's all over the thread anyway.
The sooner you customise your phone to your heart's content, the better you can appreciate it's full potentials.
Cheers!!!
Sent from my GT-N7000 using xda premium
letters_to_cleo said:
Hi,
What is your battery life on the Note? Does it last a day even two?. If it does, then that is pretty much normal. You whine on a phone that you just use for only 2 days? Stop whining and complaining. You havent have had utilize the full charge and recharge cycles of your battery and now your whining already.. Man, give your Note a week or two and your battery life will be okay.
Hmm.. Is this the first time you use an android device? What phone where you using.before? If you we're using a non android device e.g. Symbian or etc. Then my reaction to your complains (of your Note) is justifiable. Symbian for the fact has always been known to be very good or decent in terms of battery life.
Now android OS, is known throughout (irregardless what smartphone/tablet you have) to have the AOS bug. It is a bug where there's some sort of a battery leak and hencefort most android users tend to root their phones so that they can stop background stock applications from running in the background. The births of custom ROMS and Kernels have given some tremendous wonders also especially on phone's UI and more so on battery management.
Again. Stop complaining and go down root your phone and install battery saving apps or custom ROMs. It's all over the thread anyway.
The sooner you customise your phone to your heart's content, the better you can appreciate it's full potentials.
Cheers!!!
Sent from my GT-N7000 using xda premium
Click to expand...
Click to collapse
My battery life is 5 - 6 hours. I am accept 12 hours. I wish it last 12 hours. Before I used Iphone4, it is not so long for battery life , however it is acceptable. I did not understand how notes's battery life so short.
Moreover I can not use custom rom. because they r not good as well as stock rom. ALl of them have some problems. But I can change my kernel.
to get battery life you either
a) dont use your phone or
b) get information to use your phone more wisely
So..
a) download a battery monitor.. there are a bunch recommended..
b) read the other 200 threads on battery life and dont start another one. Each and every question has been asked and answered ad nauseum
while you are figuring out root, and task killers, here are a few easy tips to help..particularly when you are putting the phone down for a while
apps>task manager>active apps> CLOSE ALL
apps>task manager> RAM> CLEAR MEMORY
settings>applications>running services> review and shut down apps/games that may be running in background (and that are not critical)
Again.... RESEARCH the forum.. the answers are already here. and you should read and post in existing threads
eediz said:
My battery life is 5 - 6 hours. I am accept 12 hours. I wish it last 12 hours. Before I used Iphone4, it is not so long for battery life , however it is acceptable. I did not understand how notes's battery life so short.
Moreover I can not use custom rom. because they r not good as well as stock rom. ALl of them have some problems. But I can change my kernel.
Click to expand...
Click to collapse
You could also have a defective battery.
On my iPhone 4, my first of 4 that were faulty, battery life depleted in less than 12 hours of STANDBY only on wifi, nothing syncing. Only being on. Battery life was so bad.
It's not uncommon to get a dud battery sometimes.
Try doing a complete restore, stock EVERYTHING, don't push anything (except email, cal, and contacts, you know, the basics) and see if you're having the same results. If on a fresh, stock, install you're having the same issues, then you've got a defective unit and/or battery.
Hope I've helped.
eediz said:
My battery life is 5 - 6 hours. I am accept 12 hours. I wish it last 12 hours. Before I used Iphone4, it is not so long for battery life , however it is acceptable. I did not understand how notes's battery life so short.
Moreover I can not use custom rom. because they r not good as well as stock rom. ALl of them have some problems. But I can change my kernel.
Click to expand...
Click to collapse
There are quite decent custom roms for the Note. I have tried many gingerbread versions (Chracks, rocketrom, cassies etc) currently on chrack's v18 small (LC1) with speedmod latest kernel.
I have not faced performance issues on this. But each user is different so u r the boss.
Best give the custom kernels a try for now. If u find the battery life better then ur problem is solved. The advantage of custom rom is that so much useless bloatware in the stock is removed for better space mgt & performance.
have provided some tips in the following link, feel free to go thru.
http://forum.xda-developers.com/showthread.php?t=1600691
eediz said:
Moreover I can not use custom rom. because they r not good as well as stock rom. ALl of them have some problems. But I can change my kernel.
Click to expand...
Click to collapse
dude, you are ridiculing some of the well known devs who have made custom ROMS for all to appreciate and use. IF there was and is a problem on a particular custom ROM, it is or might be cause indirectly on the user itself, on what apps he/she insatalled on his phone. Surely you cannot generalize all custom ROMS have problems do you? if all have problems, the devs have some new revisions to fix those bugs and in no time at all your Note would be in tip-top shape again.
If as what you say, Custom Roms have problems.... then why the heck most people I know have used them and have big wide grin on their face to show off what they have and even posting a copy of their latest ROM pictures here... not to mentioned in YouTube as well.
ok. Which rom is the best stable than ? Which I should use ?
go read the threads on battery performance.. loading a new ROM will not fix problems if you do not know what you are doing.
eediz said:
ok. Which rom is the best stable than ? Which I should use ?
Click to expand...
Click to collapse
first quote :laugh:
Hi there.
I had the same issues but only after the update done on ICS.
I have over 140 different application and nearly all of them have been purchased.
What happens is that, when you are not using your phone it should go to "deep sleep". This allows your phone not to run any application and merely use any battery. Your problem probably come from somewhere in your setting an automatic update. That drains a lot....
I downloaded different application hoping that it would work out such as Juice Defender, watch dog and many others. After lots of research, I found out that it is not good for your phone to have an auto killer app or even an application that modifies the functions of other applications.
So I downloaded battery spy and cpu spy on "google play" and followed the instructions.
I needed a deeper analytic application "Kernel" and this was THE application that allowed my phone to go from 6-8 hour to 28 hours.
"Better battery stats", it's not free but was really worth the spending.
Google play chronological download
1) watch dog
2) battery spy
3) cpu spy
4) better battery stats
Good luck
I keep switching my cellphone off while not using, and same goes for wifi. Using it as a secondary phone as well. It lasts only 4-6 hours.. :S I keep closing background apps, and kill app once im done with it..
Also be aware that in areas with bad network strenght, the GNote really suffers.
I normally have no complains (0,6-1,5% battery usage per hour) but where I am now, the GNote really works hard to keep the connection and my consumption easily goes to 4-6% in deep sleep and 15-20% when using it...
eediz said:
ok. Which rom is the best stable than ? Which I should use ?
Click to expand...
Click to collapse
If you like stock samsung looks try CleaNote 3.10 , very good n battery life , I get around one day backup with heavy usage and 2 days plus with moderate usage .
If like pure google , then try cm9 , very stable and quite good on battery back up .
And if you dont use 3g or 3.5 g or any such networks then select GSM only or use 2g networks only ( Settings -> under wireless and connectivity , More -> Mobile Networks )
Also keep your display brightness to minimum , control the brightness manually instead of auto brightness .
Turn off auto sync ( big advantage over battery ) .
Scan for running apps and cached apps and force stop the ones which you dont use .
Use titanium back up and freeze some of the bloatwares ( stock samsung apps ) or uninstall them , like readers hub , mydiary , they are **** .
And dont use task killers , they drain your battery . they may clear rom but some apps restart automatically and that needs more juice than running those apps . Hope all these suggestions help . From my experience with this phone
Tonio78370 said:
Also be aware that in areas with bad network strenght, the GNote really suffers.
I normally have no complains (0,6-1,5% battery usage per hour) but where I am now, the GNote really works hard to keep the connection and my consumption easily goes to 4-6% in deep sleep and 15-20% when using it...
Click to expand...
Click to collapse
I didnt know that, My signal is usually 10-40%. I have bad signal strenght at home.
my battery decreases 1% in around 5 minutes of use or something. Today it lasted me 10% on standby for around 8-10hours.
ryandigweed said:
I didnt know that, My signal is usually 10-40%. I have bad signal strenght at home.
my battery decreases 1% in around 5 minutes of use or something. Today it lasted me 10% on standby for around 8-10hours.
Click to expand...
Click to collapse
You need to purchase and install "better battery stats" and also install cpu spy (I'm assuming you're rooted) and use them to monitor your phone and battery in order to solve your issue. Google both and you'll find several good threads on xda about using and interpreting these apps, but if you get stuck post some screen shots from both and someone here can almost certainly help. There are a number of potential sources of such problems, generally rogue apps, and also a bug or two, but it is impossible to offer help without the details these apps would provide.
hchxoom said:
You need to purchase and install "better battery stats" and also install cpu spy (I'm assuming you're rooted) and use them to monitor your phone and battery in order to solve your issue. Google both and you'll find several good threads on xda about using and interpreting these apps, but if you get stuck post some screen shots from both and someone here can almost certainly help. There are a number of potential sources of such problems, generally rogue apps, and also a bug or two, but it is impossible to offer help without the details these apps would provide.
Click to expand...
Click to collapse
Thanks for that, i will install it. By the way i got the "battery widget" installed, which has gained popularity on the market.
Also im only using 9% of brightness of my phone.
I'm using a rooted stock 4.0.3 and I'm finding battery life its pretty good - better than unrooted GB was in fact. Simply freezing bloatware via titanium and limiting sync on some (not all) apps and services makes a gigantic difference. Design your phone around your own needs and you'll end up with an amazing device that you'll fall in love with all over again.
Sent from my gnote as always

[Q] Help with CM11 based ROMs ! Low performance and battery drain

Hello to all,
I have two problems that are almost making me go back to stock 4.3 ROM
The first is related to the battery, the android system appears first with 25% + battery drain, and in most cases equal to or greater than the battery consumption of the screen! This makes my battery does not pass a day, and the stock I went much further (without STAMINA MODE).
The second issue is regarding the performance measured by AnTuTu. I know that does not mean much, but in the STOCK I get 25.5k and I read out there that people also manages the same in CM11 LBL (the MrSteve555 and also bagyusz), I do not understand why I can here the maximum 22.5K .
Independent of ROM I have put the same results. Tested in all versions of MrSteve555 and in the last two of bagyusz. Also tested in the PAC-man RC-1 neXus PRIME, same result and battery consumption.
In all ROMs I wipe system, data, cache, dalvik cache.
Does anyone have any idea how to solve this? I am discouraged because I love the CM11.
Ps: I use .207 kernel and I've tried with .205 also, same result. (I have LBL)
Damn what is that screenshot supposed to show?? 30 minutes off charge and it is at 99%!!! It's obvious that the screen consumption will be minimum, it was on for a minute or so probably... I know that usually android system drain is higher in cm than stock but you should compare your battery stats at the end of the day...
Please reset the counter by tapping on the trash icon on the activity bar. Then please post a screenshot after hours of usage. This will enable other people to properly interpret your battery stats.
Some tips though, you will most likely encounter a slight battery drain while using custom ROMs. This is due to the fact that stock ROM and custom ROM works differently. You might actually having a normal drain than a supposedly "bad" one.
By the end of the day will be the same... Anyway I will post later.
I attached new images for better understanding.
Does anyone have any idea?
Firstly, Antutu scores mean sh*t...
In the past I've had allot of ROMs with very bad Antutu scores which performed much better in terms of speed and general user experience than a standard ROM with higher Antutu score.
Furthermore, install better battery stats or any other wakelock detector app to see what is draining your battery. The pictures you are showing us now don't help at all.
I've exactly the same problem, android consumes always more than 25% battery too...
Silver Wx said:
I've exactly the same problem, android consumes always more than 25% battery too...
Click to expand...
Click to collapse
As I mentioned above, you need to identify what is causing the wakelocks first. Untill then there's absolutely no solution that can be presented to both of you.
By pointed by Gamm86, it might be due to wakelocks. Once the wakelocks are found, you may use Greenify to hibernate that rogue app. When the app is selected within Greenify, you will find it easier to see the wakeup path and cut it off through Greenify.
Wakelock Detector
Greenify
TechnoSparks said:
By pointed by Gamm86, it might be due to wakelocks. Once the wakelocks are found, you may use Greenify to hibernate that rogue app. When the app is selected within Greenify, you will find it easier to see the wakeup path and cut it off through Greenify.
Wakelock Detector
Greenify
Click to expand...
Click to collapse
It's not always apps themselves that cause wakelocks.
Background services related to phone or app settings are usually the culprits, meaning greenify won't resolve all wakelocks.
Gamm86 said:
It's not always apps themselves that cause wakelocks.
Services related to phone or app settings are usually the culprits, meaning greenify won't resolve all wakelocks.
Click to expand...
Click to collapse
yes I understand. Hmm i believe you are more experienced in this matter. Would you tell me how to stop those wakelocks that caused from other services? I would really appreciate that, cause I find many people solve this problem but they never did expose where they learn from or the methods they use. and yea, I've googled but I got nothing
TechnoSparks said:
yes I understand. Hmm i believe you are more experienced in this matter. Would you tell me how to stop those wakelocks that caused from other services? I would really appreciate that, cause I find many people solve this problem but they never did expose where they learn from or the methods they use. and yea, I've googled but I got nothing
Click to expand...
Click to collapse
Use Disable service app. Check which wakelock is occurring and disable that service.
Or get the donate version of unbounce and delay the wakelocks like every hour or so.
I already use Greenify and hibernate all apps that are not chat, not solved.
I also noticed that while I sleep and the phone remains idle the android system does not consume a lot of battery, something around 6%, but when you turn on the screen and the phone is active it starts to drain. So the problem is not in the wakelock, but elsewhere.
I'm using the applications suggested to post new screenshots later.
I used the apps for a day and I'm posting the screenshots of the result ... the system keeps draining and I don't see any information that would help me on the images.
Anyone have any ideas?
Jeanborba said:
Hello to all,
The second issue is regarding the performance measured by AnTuTu. I know that does not mean much, but in the STOCK I get 25.5k and I read out there that people also manages the same in CM11 LBL (the MrSteve555 and also bagyusz), I do not understand why I can here the maximum 22.5K .
Click to expand...
Click to collapse
I'm on MrSteve555's CM for LBL and was also wondering why I was getting a much lower AnTuTu score than stock. Then I discovered that I get 22.5K scores WHEN CHARGING and 25.5K scores running off the battery!
Jeanborba said:
I used the apps for a day and I'm posting the screenshots of the result ... the system keeps draining and I don't see any information that would help me on the images.
Anyone have any ideas?
Click to expand...
Click to collapse
I have noticed the same issues on all 4.4.x based roms (slimkat, pac, PA etc.). The only fix i found was to disable the automatic screen brightness. After disabling it the system_server service became normal and Android System dropped to 9-8% of overall battery consumption.
Good luck
Diablo.69 said:
I have noticed the same issues on all 4.4.x based roms (slimkat, pac, PA etc.). The only fix i found was to disable the automatic screen brightness. After disabling it the system_server service became normal and Android System dropped to 9-8% of overall battery consumption.
Good luck
Click to expand...
Click to collapse
I've exactly the same problem of you : thanks very much for find!
My phone never enters deep sleep when i lock it with WiFi on, this happens on cm11 by steve it drains a lot overnight
4.00 - 4.30 hours on screen = 2 days with playing fifa 15 and facebook + viber. 1-2 photos, 60 mins browsing and about 30 mins talk good for me without using battery safe apps - lock my bl and using .207's kernel on mr.steve555's Weeklies CM11 lbl
try CM11 Mahdi Rom 4.4.4 with gapps minimal 23mb ,my battery work as well after play music,game and facebook

Paranoid Android ROM battery life issue

I'm new to posting on XDA so I apologise if i posted this thread in the wrong section.
I've flash the ROM with nano Gapps about 2 weeks ago and been clearing cache over time and i still can't get above 4 hours SOT. I personally use a dark theme (substratum) throughout my apps and system apps, Bluetooth and NFC are always disabled and location is set to battery saving. I can't find the app which is hogging my battery. FYI, I rock a similar setup on oos 4.5 and easily it lasts 6 hours of SOT. However, i do think its the Snapchat application but it's an important app to me. Any suggestions ?
Are you Chinese?
Z.boy said:
Are you Chinese?
Click to expand...
Click to collapse
Nope, but English isn't my first language.
Hey,
If you could include a few more details such as your kernel (if you've flashed one) or PA version, whether you're coming from a clean/dirty flash and other additional information, that'd be great, so the community could address your issue better.
Also, you may want to check wakelocks and battery health (NOTE: not Battery Life, Battery Health).
If you're on PA, you may want to revert to OOS 4.1.X, and check your battery life and SOT.
Snapchat is a universally known app that has its' fame for being battery heavy, so if it shows up as a heavy battery user, that's because it is. The reason is, because it has heavy use on the Camera, GPU and mobile network or wifi.
Cheers.
thes3usa said:
Hey,
If you could include a few more details such as your kernel (if you've flashed one) or PA version, whether you're coming from a clean/dirty flash and other additional information, that'd be great, so the community could address your issue better.
Also, you may want to check wakelocks and battery health (NOTE: not Battery Life, Battery Health).
If you're on PA, you may want to revert to OOS 4.1.X, and check your battery life and SOT.
Snapchat is a universally known app that has its' fame for being battery heavy, so if it shows up as a heavy battery user, that's because it is. The reason is, because it has heavy use on the Camera, GPU and mobile network or wifi.
Cheers.
Click to expand...
Click to collapse
I've not flashed any kernel or any other ROMs before and I clean flashed PA 7.3 which is the latest version available. I've also flashed arter97's F2FS boot.img. Wakelock details are provided in the screenshot attachment as well as the battery health condition data provided by Ampere.
I've not had any issues with Snapchat on OOS though :/
Note that I didn't greenify it too.
Edit: I'm having difficulties to post the screenshot
EpicDerpFace said:
I've not flashed any kernel or any other ROMs before and I clean flashed PA 7.3 which is the latest version available. I've also flashed arter97's F2FS boot.img. Wakelock details are provided in the screenshot attachment as well as the battery health condition data provided by Ampere.
I've not had any issues with Snapchat on OOS though :/
Note that I didn't greenify it too.
Click to expand...
Click to collapse
Ok

Pixel Experience Rom Pie

I just installed pixel Experience Rom pie update from the official site. Everything is great. No bugs till now. But battery is draining like crazy. 30% battery drain in one night. Help me please what to do. Should I go back to Oreo? Suggest me any good roms with just as it is pixel experience. I don't need customisation. I need stability.
funnybones said:
I just installed pixel Experience Rom pie update from the official site. Everything is great. No bugs till now. But battery is draining like crazy. 30% battery drain in one night. Help me please what to do. Should I go back to Oreo? Suggest me any good roms with just as it is pixel experience. I don't need customisation. I need stability.
Click to expand...
Click to collapse
Use custom kernel, its help:good:
To me it Looks like a standby time battery drain bug, most ROMs suffer through this at some point. One of common bug.
As mentioned above flash custom kernel or consider going back to previous known good Pixel Experience build you have used or you can try turning on battery saver on standby time.
I also had this issue on Resurrection Remix Oreo build and battery saver helped me to save battery on my device on standby time.
I am currently using Havoc OS Pie Latest ROM it also has tremendous heat issue (battery drain of from 30% to 9% in 15 minutes) without even using device.
I like this ROM for it's customizations and stability but heating issue was causing me to stay away from it.
Just yesterday I've clean flashed Havoc OS latest Pie build on latest Rockstar kernel and it's going great.
No huge battery drain and no heating issue and also battery backup is good.
Try flashing latest Rockstar kernel or other your desired kernel if you wish.
I'm Using Pixel Experience ROM (Go) and it's working fine. I'm using Jaguar Kernel.
Find it on 4pda .ru
Here.

Battery Drain on 9.0 Pie

Hi people,
Can someone give me and opinion of the battery drain with a note 9 on pie?
I bought my Note 9 four days ago and updated to 9.0 pie right out of the box, I think that battery is still optimizing for usage but I find it very bad with battery life and SoT. I'm posting a screenshot, if you have some tips ?
I'm with exynos, 50% brightness display, exynos version, Bluetooth off
ineedandroid said:
Hi people,
Can someone give me and opinion of the battery drain with a note 9 on pie?
I bought my Note 9 four days ago and updated to 9.0 pie right out of the box, I think that battery is still optimizing for usage but I find it very bad with battery life and SoT. I'm posting a screenshot, if you have some tips
Click to expand...
Click to collapse
You answered your own question! Battery is still optimizing for usage! You have to give it 10 or so days before it battery gets better! Also turn off Wi-Fi, Bluetooth, 4G, Sync, turn the screen off turn everything off lol messing with you 2/3 weeks mine took to settle down!
I'm having the same problem. Android System was waaaaay lower before. It's always at the top of the list now. :/
vinyl3131 said:
I'm having the same problem. Android System was waaaaay lower before. It's always at the top of the list now. :/
Click to expand...
Click to collapse
Please can someone give a tip to make Android system's drain lower?
ineedandroid said:
Please can someone give a tip to make Android system's drain lower?
Click to expand...
Click to collapse
There's plenty that can be done, especially if you have the exynos version of the phone.
-Unlock bootloader and install Dr Ketan's rom, it is fantastic.
-Then apply endurance kernel.
-Use Magisk manager to apply module: Universal GMS Doze
-Use Mtweaks to apply a few kernel tweaks
I haven't gone this far just yet as I'd like to see how the phone goes without it for a few weeks but you can also install greenify or if you want to really get serious, greenify xposed module. Personally I find the battery life of the note9 to be fantastic but you must keep in mind that the screen is enormous and hi-resolution. Whenever you are using the screen, especially at a high brightness level the battery is going to drain - it can't run on good intentions.
Try turning down the brightness. If you are absolutely serious about battery life over everything else, you can disable auto-sync, remove the official facebook apps if you have them and replace them with faceslim and lite messenger and modify the notification settings.
Doing all of the above and only turning the phone on when you need to make a phone call or use navigation etc should net you an easy 4 days+ of useage but then again, you may as well have bought a $30 powerbank phone.
Tripping Knox hardly sounds like a good idea if I'm honest.
If your Android System is high then something in the background is wrong. You could try clearing cache then give the phone a couple days to settle
Battery life varies significantly with any phone and any version of Android.
Often we assume, wrongly in my opinion that a very large factor in battery life is the version of Android , hence the numerous posts on this forum who wish to or have gone back to Oreo, for reasons I consider delusional.
What apps you have on your phone and how often you use them are significant, playing games that use lots of cpu and gpu is going to impact battery life.
Web browser and YouTube rather less so.
I have experienced lower and higher screen on time and standby time with the same apps and version of Oreo, and Pie (both on beta and released)
I am on Exynos Note 9
Bought and used since release date Aug 24 2018, haven't used so called battery life friendly charging (20% to 80% etc)
Can run battery down to 0% on occasion and charge to 100% using fast charge, often left on charge overnight.
Yes there are some optimisation that may help and I use a few, I couldn't tell how much they help though as just varying usage is a greater factor in my opinion
Battery performance from yesterday
18.5 hours total usage with 9.25 hours screen on time

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