Battery issues after update to Pie - Samsung Galaxy S8 Questions and Answers

Hi, I have exynos version of my s8. It's about 1,5 years old. After update do Pie, I have a lot troubles with battery.
At first, if the battery drops to 8-6% it will die in the next 1-2 minutes. I try to do charging from 0 to 100% to recalibrate battery indicator but this don't helps.
Now I see something new, If I will plug the charger for example at 8% battery status it will drop to 1% (8-7-6-5 etc) and then it starts to rise... I have never seen something like that on my previous phones. All the problems with battery started after updating to Pie... Do anyone else have similar problems? Are there any solutions to this issue?

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Zenwatch battery drop

I was wondering if anyone else was experiencing this. If I have the screen on or off this seems to happen. The battery shows a normal show drain, then ask of a sudden plummets 50+% in a matter of an hour, then stabilized. Any thoughts or suggestions.
I always start at 97% not 100. Android 4.4.4 current android wear version.

Battery problems after Lollipop upgrade, but downgrading hasn't solved the issue.

My Samsung Galaxy S5 started having battery problems after the Lollipop update. Since many users has reported the same thing I downgraded to KitKat, which included a complete wipe of all apps, but that did not change anything. Maybe the Lollipod upgrade had nothing to do with this?
I did a comparison with my SO's identical phone. I fully charged them, put them in Airplane mode and let them be for 100 minutes. The results? Her phone had 96% left. Mine had 82%. **Four times** as much battery used! Battery monitors report nothing except that the screen and the android system uses most of the battery.
Another unusual thing: normally the phone automatically shuts off at 1% but now it shuts itself off randomly at 2% to as high as 12%. Battery calibration out of order or a dying battery? No, because I switched the battery with my SO's and I still experience the same issues.
I still have warranty left, but we all know that would likely mean I will be without phone for a month so I want to try everything I can first. Does anyone have any suggestions on this issue?

Battery drain!

I don't know what the hell is going on with my Note 4 (SM-N910F), but my battery is draining a lot faster then it ever has. A couple months ago i rooted my phablet, tried out two or three different custom ROMS (Omega was one of them), but my Note 4 got so hot it got into a bootloop as soon as I entered my PIN. I reflashed stock ROM and it was back to normal again, but lately it started to warn me for low battery (the 5% warning) and turn off itself in seconds even when i had 20-30% battery left. This didn't happen every day, but it was annoying. So i re-rooted and installed CM 12.1 thinking it was the 5.0.1 and 5.1.1 stock updates. The first night I charged it all night but only got 83% battery when I woke up 9-10h later. Today when I was scrolling FB with 35% battery left, the phone warned me about low battery and dropped to 5%. Is it possible that the battery drain is because the overheating could have caused some damage to the phone/battery? I tried calibrating the battery two times, did everything I could find on the net, but nothing helped. I would like to know if there could be something more than the battery that could cause this because I don't want to buy another one for nothing.
you could try to re-calibrate your battery, you can find a app for that on playstore.
is your phone still getting hot when your battery drain is high?
you could post an image of your battery stats from settings or better battery stats so we can see, why it's empty so fast
I already tried that two times, it did make the battery last a bit longer but the 35%-5% problem is still there. I'm new to XDA so I can't upload the screenshot but I can't see any app or activity that's draining the battery. I've done everything I could find in the forums (lower screen brightnes, turned off auto wake, even downloaded kernel adiutor and changed some settings a guy posted) but nothing has changed.. I'm just wondering if it's the battery that's the problem or something else so I don't fo out and give out money for a new battery if it won't help..
And yes, my phone is still getting hot when the battery is draining fast.. I do have an insurance that I could use but if it's just the battery then I can buy a new one. I forgot to mention that the phone gets pretty hot when I charge it, somewhere above the battery connectors. Eather that or the micro-USB connector, or even both at the same time.. The cable has turned yellow just under the connector so I don't know if it could be the charget that messed it up. This started before I even flashed a custom ROM.
Well I couldn't take it anymore and decided to downgrade my phone back to 4.4.4 which it came with. 9h on battery, Spotify was playing for 3h, played a little on Snes emulator, facebook, chrome, and I still jave 56% battery left. Seems to me that I was one of them who got the f*cked update for 5.0.1 and 5.1.1.. my phone is back to normal with speed, battery usage and heat. I'll let the battery drain completely today and see if it will turn off at 25-5% like it used to. The worst thing is that a game I used to play dosn't work on 4.4.4.. but it's still worth it!

Note 4 battery, signal and performance problem.

I've been having this strange problem these last few weeks. It happens in different ways.
1. Bellow 25% phone randomly shuts off then when i reboot its 0% battery.
2. Bellow 25% at random % I lose phone signal then the phone starts to lag and capacitive keys don't work then the phone shuts off and when i power it on its at 0%.
3. Phone gets to 15% i plug it in to charge, it doesn't charge but discharges to 0% then shuts off and after that it charges.
If i remove the battery then put it back in after it says 0% it may show 30%/20/15/13/25/30 etc. Sometime it doesn't charge after 87% or 92%. Is it the battery or is something else at fault? Also i can't get more then 2h15m screen time whatever i do and wifi drain is 30% in gsam.
Earlier I had same problemes on my Note 1 and it was because of my battery. Probably your problemes are becuse of your battery too.
Ok I will try a new battery.
I have exactly the same problem!!!!
Like exactly.
However I'd like to add some things:
1. Sometimes the radio signal for mobile starts randomly cutting in and out. It will be full bars, LTE, then nothing, no signal symbol. Then Full bars again, then no signal. In 1 minute revolutions. I am not physically moving during this time.
2. Even at near full battery the phone will get super laggy, stutter, and then finally crash. Once it reboots the battery will be 40% or something. Not super low but lower.
3. The camera seems to have a huge effect as well. I will open the camera, take a picture, and the picture won't save...it will just start to freeze the phone up until I have to pull the battery or it reboots on its own.
I also have a new battery coming in the mail.
However I should note that I am Note 4 910-H using a 910-C variant Custom ROM.
I was worried it was the special Modem I flashed to make the C variant ROM work on my H variant phone that was causing the problem.
Great, but unfortunate to see someone else having this issue too.
Ill post results of the new battery here.
Btw, ive been able to resurrect it from a very low state of charge (3% etc). The only way to do this is to use my fast charger. The fast charger is the only thing that will save it. Even then it takes ages to charge and gets white hot while it does. Its like the fast charger is battling for charge against some unknown force.
Post if you remember when you get your new battery. Hope that fixes it for you.
hi
my note 4 910c become very hot when i use the internet , can i change the modem from lower android like 4.2 to android 6 ? is it work ?
I have exactly the same problem and please if any1 finds any solution just share it here... I tried almost everything but not a new battery.
Battery Calibration By All The Ways, Battery Quick Start via *#0228#, Many Custom ROMs, Many Custom Kernels and Many Stock ROMs and the problem still the same even after I cleanly installed stock 6.0.1 ... Any help please.
Thanks in advance.
New Battery fixed 99% of my problems.
However the phone still randomly freezes and disconnects from cell service.
I think its the modem driver. Freezing might also be due to sd card.

Battery percentage display error.

This is an issue I've noticed in not just one, but many ROMs that I've tried on my G5 Plus.
My phone is almost three years old, and with time, battery backup would gradually decrease, which is normal. But in my case, I've noticed that my phone isn’t displaying my battery’s true percentage at times.
For example: I usually don’t discharge my phone completely down to 0%, but what happens is that when I do it and plug in the charger while the phone is dead, the battery indicator doesn’t show 0%. It has showed 15-20% and even percentages like 52% and 62%. I don’t know what's wrong with my device. I used to think its some kind of ‘reserve charge’ and turns out, its not. After some reading, I came to know that my battery needs calibration. I tried doing it today, and drained my battery down to 0%. And long behold, my battery indicator started charging from 26%, instead of 0%.
Can anyone help me with this? Would be great help. Thanks!

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