[Q] Can Rooting your phone ruin your Battery? - AT&T Samsung Galaxy S7 Edge Questions & Answers

I am wondering if rooting your phone causes the OS to eat up more power AFTER you un-root your phone?
Here's my situation. I had my phone working just fine and I ended up rooting it with the MM firmware a few months ago. During that root, everything was great, no lag, my battery was getting 24hrs on a charge with about 8-12 hrs SOT.
Was notified the Nougat update was available. Un-rooted the phone, took the OTA update to Nougat, then rooted the phone with the Eng Img that is available on the forums. Once I got it all set up and adjusted with all the recommendations within that thread, the lag was pretty much nonexistent. But I was getting very bad battery drain. I was only able to run the phone with 10-20% drain per hour and a full charge would only last about 4-6 hours.
I ended up Unrooting the Nougat root and going back to stock Nougat. Now I have the same battery drain as when I was rooted. And I was wanting to know if Rooting could cause the CPU/OS to cause the battery drain even after unrooting?
On an unrelated reason, I am getting a new phone under warranty and wanting to know when I get the new phone, could rooting the new one cause the same issue?

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Possible battery drain introduced in the February security patch?

So a lot of people and myself over on the Nexus 6P subreddit have been discussing about the possibility of some sort of battery drain with the arrival of the Feb patch. On any ROM/kernel combination (and even on stock at some point), my phone very easily reaches 4:45-5:00 of screen time throughout a day that is from 7am-10pm for me. Over the last month, it has progressively gotten worse, on some days reaching low levels with just 3:30 SoT. After using various ROMs, I decided to try out bone stock to see if I would get the same result (this was 3 days ago). And that has been the case... The phone barely reaches 4 hours of screen time.
Well you might suggest: "Disable services such as location and sync" or "What apps have you recently installed that could be causing drains?" And that's the thing. My usage patterns have not changed at all. I barely download new apps and always stick to using the same ones. Today my location was off for a very long time and I've still gotten the same battery. I've been keeping my eye on the awake bar on battery info, and the phone sleeps as it should, so I'm sure there aren't any rogue apps.
I am seeing this as well. I actually went back to stock to see if it was the ROM I was using. Seeing the same battery degradation on stock. Running MMB29Q with Feb security patch as you can see from screen shot. Wonder if Google is aware of this. Cannot be a coincidence.
Me 2
Haven't noticed this at all, I'm getting the exact same battery performance as I always have.
I haven't noticed any extra battery drain either.
I definitely noticed this myself.
I did a factory reset and it seems to have helped, but I've only tested it for one day since.
Heisenberg said:
Haven't noticed this at all, I'm getting the exact same battery performance as I always have.
Click to expand...
Click to collapse
I'm with you. Same battery as previous factory image.
Sent from my Nexus 6P using Tapatalk
I have bought this phone in the beginning of February and my battery experience is TERRIBLE. It drained 20% battery in 16h with 17 mins SOT. I'm extremely disappointed in this device. I tried Stock, chroma and Pure Nexus and even when 0 apps are installed my battery goes AWOL. Really this is a nightmare where I paid alot of money for this phone and it acts like a personal energy waste device.
VnnAmed said:
I have bought this phone in the beginning of February and my battery experience is TERRIBLE. It drained 20% battery in 16h with 17 mins SOT. I'm extremely disappointed in this device. I tried Stock, chroma and Pure Nexus and even when 0 apps are installed my battery goes AWOL. Really this is a nightmare where I paid alot of money for this phone and it acts like a personal energy waste device.
Click to expand...
Click to collapse
1.2%/hr drain isn't great, but not bad either depending on reception/installed-apps/notification/etc
I'm running 6.0.1 feb patch. Get about 0.6%/hr screenoff drain, but I'm mostly on good wifi connection. If running around town on LTE i'd get some where around 1% screen off drain.
I've noticed that ever since the Feb security patch, the battery has drained a little faster than usual also, with no change in usage behavior.... Can someone please notify google about this?
I have not noticed anything different.
Running stock with ElementalX kernel.
I've been noticing the same thing. I used to be able to go for 4+hrs of screen on. Now, 3.5 is normal. I am on PureNexus, but I've not changed anything in the last month, after the update.
I bought the phone on 28th February. 30 minutes after arrive at home, flashed Cyanogen, and draining about 1% each minute with screen on.
Yesterday I flashed PureNexus and now reaches 3.5 hours with screen on. Way better, but still terrible.
I've noticed the same increased battery drain. I've been investigating the issue for weeks and didn't know what caused the issue until hitting this thread.
The February update introduced the SystemUpdateService wakelock on my 6P. It kept the phone awake 95% of the time and I couldn't get rid of it. I updated via fastboot with the factory images at the time. I flashed back to the January build and the wakelock disappeared. Flashed the February update again and SystemUpdateService wakelock came right back.
I didn't try a clean install with the February factory images to see if it would fix it. Maybe it would have, maybe not. I decided to give Pure Nexus a try after I couldn't fix it. I'm considering doing a clean install once the March update is released.
Me 2
Same battery issues as described for me.
I am glad to see that I am not the only one having a problem all of a sudden. I am running stock, but was about to root and run a custom ROM after becoming frustrated with the suddenly increased battery drain. I used to drop only three or 4% overnight, but now it is about 20%, with Google App being a prime user of battery even without OK Google being activated. Doze does not seem to be working as it did before. I am going to try shutting off Wi-Fi and Bluetooth at night to see if that makes a difference, but it never seemed to matter before leaving those on. Also, I do not see a way to automatically turn off push mail service at night or on a specific schedule as I could do with previous phones.
I'm glad. I thought I was the only one experiencing this.
Sent from my Nexus 6P using Tapatalk
Interesting - I have noticed that the battery life has tanked on my 5X fairly recently (been using it for a few weeks - will try on the 6P next).
Presumed it was just a rogue app or something, although nothing seems to be causing excessive wake locks etc. It is hard to quantify though, so it could just be looking for a problem where there isn't one.
I'm doing a clean install on my Nexus 6P from the March security update factory images, should be able to see if the battery life I'm getting is similar to January as I have a fair idea of what percentage my phone was usually down to at the end of the day.
A clean install of 6.0.1 with Feb patch and only stock apps. It's been sitting on my bed since a full charge 5 days ago. Looks like the Feb patch is not having much of an impact on battery life.

Nougat, update notification and battery life.

Hey.
I just recieved notification for new update 1.3gb large. Nougat of course.
But I am not sure i want to update. I heard it really destroys your battery life. And well even on android marshmallow I don't have a very good battery life. So what would you advise me? Do i update or not? And if not. How the hell do I remove the update notification?
And if you could tell me how my battery life is. I think it's not that good compared to other people who calim to get 6-7 hrs SOT with 20% left.
Thanks.
Do it, don't look back ?? I kept switching back and forth myself, and now I just can't go back to old mm, nougat is just too much better
Well i guess i will have to. Since i tried everything to rempve the update notification but i just cant and it annoys me.
Did it decrease your battery life? And is my battery life good? Any ideas how to get up to 6 or 7 hrs like some people?
I did not update because I was afraid the battery life would decrease. In the test at Phonearena.com, the battery life was reduced by 10%.
that depends a lot on apps you have.
I've charged it over night, got up in the morning, played net and some ppsspp for about 3h and it went 38%, still over half battery. On MM it would go a lot faster.
key word is facebook uninstall and see for yourself.
Nougat has bad battery but too many good features.i get around 5-6 hrs sot with nougat

Nexus 6P Slow charging after April Android 7.1.2 update - Fix?

My Nexus 6P is experiencing "slow charging" after April 7.1.2 Update (OTA).
I am using stock Nexus 6P charger, which now shows "charging rapidly" on lockscreen with 5 hours estimated time of full charge but is charging 18-20% in 1 hour.
Anyone else having this issue?
Tried rebooting, no effect. Any other fix?
https://forum.xda-developers.com/ne...t/xthermal-mod-fast-charging-cpu-gpu-t3433784 worked on the latest beta, didn't flash update yet
Same here on my Nexus 5x with slow charging. I also got excessive battery usage by the Android os and Android system. They doubled on battery consumption after the ota update. Driving me nuts. I lost at least 3-4 hours of battery time with this update. What used to be plenty of juice now barely gets me through the day. I tried wiping the cache partition restarting and so forth. I am about to flash back to 7.1.1 but can't justify the burden just yet.
L_A_H said:
Same here on my Nexus 5x with slow charging. I also got excessive battery usage by the Android os and Android system. They doubled on battery consumption after the ota update. Driving me nuts. I lost at least 3-4 hours of battery time with this update. What used to be plenty of juice now barely gets me through the day. I tried wiping the cache partition restarting and so forth. I am about to flash back to 7.1.1 but can't justify the burden just yet.
Click to expand...
Click to collapse
Have you done a backup followed by a full wipe if it happens again? Could also be a misbehaving app
mobileman88 said:
Have you done a backup followed by a full wipe if it happens again? Could also be a misbehaving app
Click to expand...
Click to collapse
I haven't tried that but if i decide to go down that route, i will probably downgrade back to 7.1.1 while i'm at it.
Slow charging happens pretty frequently, i can say around 7 out of 10 charges. Haven't properly tested yet but seems to happen when charging at battery levels below 10% or so. I usually do not go this low on battery but thanks to the recent update this became a daily thing. I wonder if the frequent deep cycles will degrade the battery faster.
The android system and android os spends 14% and 11% battery respectively on every cycle. Both the battery drain and slow charge started immediately after the 7.1.2 OTA update. I haven't updated my wife's X5 due to this bug and her's is behaving as usual, spending 8% and 6% for the same android system and os.
The reason for the excessive battery usage is that Google is defaulting the kernel to very high performance settings. They eat up the battery and make the phone run warmer and if you aren't rooted and can't flash a custom kernel there's not much you can do about it. I think Google is trying to burn out these phones. I can't think of a legitimate reason they would run the kernel settings so high.

Why I went back to Marshmallow (Answer: Battery Life)

So I had Nougat ever since it came out and used it a lot, but went back to Marshmallow a couple of days ago because of:
...Battery life. No matter what apps, settings, versions (B360, B380, B381), recommendations etc. - Battery life is simply better and more reliable on Marshmallow. Yes, I know, I did factory resets, downgrade, upgrade via OTA, deactivated this and that, pretty much everything you read on the threads here and elsewhere, it still couldn't catch up to Marshmallow. Don't get me wrong, battery life on Nougat is not terrible - I even convinced myself over the months that it is pretty much the same or even better, but that's simply just wishful thinking. As soon as I downgraded I could notice a significant improvement.
What do I mean by improvement? For once it is more reliable meaning I know what I get. On Nougat I had days where I got 3 hours SOT, then 4 or 5 on others. I had 2 percent stanby drain per hour, then 5, then 1 - it was just more random. On Marshmallow I always get pretty much the same. Stanby drain of 1 percent or less per hour and SOT of 6 or more hours (I'm at 3:40 SOT at the moment with 18 hours and 45 minutes since the last charge and exactly 50 percent battery left). So not only is it more reliable, it also gives me more SOT and lower standby drain.
Regarding the standby drain: When installing apps like ForceDoze on Marshmallow, it lets the device enter Deep Doze the minute I turn off the phone (meaning I often have deep doze rates of above 98%) which leads to little to almost no standby drain without losing any benefits (notifications still come through when added to the whitelist). Deep sleeps rates are also above 90 percent. With Nougat deeps sleep rates are only around 80 percent (given the same apps, settings etc.) and doze rates are much worse. Yes, I know all about light and deep doze, but light doze doesn't start until 5 minutes after the device is turned off (even with apps like ForceDoze) and those 5 minutes add up, especially if you are checking your device often. Also, it doesn't enter deep doze which arguably consumes less power until much later (often hours) and there is also no way I could change that with ForceDoze or Greenify. What's more, the ForceDoze setting of "ignore device movement" actually works on Marshmallow but didn't reliably work on Nougat meaning the deivce enters and stays in deep doze the minute you turn off your phone even if you are moving or driving etc. This made the difference between Marshmallow and Nougat even greater for me when driving or walking around town.
One additional thing I noticed. is that Android System and Kernel (Android OS) usage was higher on Nougat than on Marshmallow, which also worsened battery life on Nougat for me. Again, this could be reliably replicated with the same apps, settings etc.
Granted, everything else is pretty much better on Nougat (speed, UI, notification bar, lock-screen, security updates, additional features etc.), but if you value battery life above everyhing else (which I do), I still think Marshmallow is the best on the Honor 8 and, frankly, I don't see the point of updating to a newer version of Android if it doesn't come with at least the same battery life, as it is one of the most central features of a phone. I don't know and don't really care whether it's Nougat itself or Honor, I just hope that eventually (maybe with B38X or B39X), battery life will fully match that of Marshmallow. What do you guys think? What's your experience?
I never used MM longer than a day or two before upgrading to N, so I can't comment on which is better, but I can confirm that (with N) I've seen random days where the battery drain is unreal during standby, and other days when it hardly drains at all during standby. But ever since I performed a factory reset after upgrading to N, the drain has been very predictable. Standby drain is minimal and SOT is 6+ hrs. Hard for me to complain when I couldn't get that much SOT from the Sony Xperia Z3 Compact on KK, and that was a battery champ! I finally feel like I'm getting the newest features and great battery life at the same time.
You need a choice for people who never used MM in your pole to make it more accurate.
My wife just got her Honor 8 today. It's on Marshmallow. Mine is on the latest Nogat. Each update killed my battery life not significantly but noticably. I can relate to you wanting to downgrade.
While I never had an Honor 8 with Marshmallow, I was about to update her phone to the latest until I saw this thread and am glad I didn't. If Oreo fixes battery life issues, I'll happily update both our phones to it.
For her, this is her first Android and is coming from Apple. Last thing I wanna do is give her an excuse (battery life is a great one) to go back to Apple.
And the funny thing is....she doesn't care about the app tray like most of us Android users lol
Let's see how this pans out!
tiguy99 said:
My wife just got her Honor 8 today. It's on Marshmallow. Mine is on the latest Nogat. Each update killed my battery life not significantly but noticably. I can relate to you wanting to downgrade.
While I never had an Honor 8 with Marshmallow, I was about to update her phone to the latest until I saw this thread and am glad I didn't. If Oreo fixes battery life issues, I'll happily update both our phones to it.
For her, this is her first Android and is coming from Apple. Last thing I wanna do is give her an excuse (battery life is a great one) to go back to Apple.
And the funny thing is....she doesn't care about the app tray like most of us Android users lol
Let's see how this pans out!
Click to expand...
Click to collapse
An older battery compared to a new one. One lasts longer, that's so crazy to think batteries might depreciate over time. ?
I bet you think you can kill your battery by leaving it plugged in too.
agraceful said:
An older battery compared to a new one. One lasts longer, that's so crazy to think batteries might depreciate over time. ?
I bet you think you can kill your battery by leaving it plugged in too.
Click to expand...
Click to collapse
?
I like this guy.
Good to see there's still a few "passionate battery life" folks left on XDA.
I was almost starting to forget how good it felt to run into another one of you.
Keep hope alive my brother!
Keep hope alive

Marshmallow vs. Nougat Battery Life

Hi. I am still on Marshmallow and am constantly being asked to update to Nougat. I am reading the battery performance / on screen time i snot as good in Nougat as it was on Marshmallow. Can you share your experience? One of the reasons I needed this phone was for battery life and I don't want to lose that.
I think mine might be less on Nougat than MM. But, I'm using different apps lately that seem to keep the phone awake more frequently. I'm easily still getting 4-6 hours of screen time from 4:30am to 10:30pm and going to bed with 25-50% battery. Again, it depends on how I used the phone during the day.
Yes, it seems a little worse than MM, but I know I have apps since switching to Nougat that tend to wake the phone more frequently.
I'm definitely not complaining about the battery life on this phone. I often go 40 hours without charging.
So you mean even if there is a difference it is minimal?
Also, do you have the US version?
Yes, US. The longest I went was 3 full days without a charge. Something like Monday 4:30am to Wednesday 10:00pm. Just shy of 9 hours screen time I think.
The difference between MM and Nougat was very little. Honestly, the UI is much better in Nougat than MM. (granted, it still needs work) Positive Nougat UI changes outweigh the battery life change.
Look at it this way... How much use time do you need a day? You should be able to still get 5-8 hours easily depending on usage.
I feel its the same, I've not fully measured it but I'm still getting from 3 to 4 days of battery after Nougat. I mainly use the phone for receiving calls, whatsapp, instagram and twitter, actually Twitter is the app that I use the most.
Right now I have 75% left and still tells me it has 3days of battery left, so that still a great battery duration
Well. I'm on board now too. And you all are right: no noticeable differences at the moment, although I did wipe cache and all data via recovery after update. Liking this phone.
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