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2012 Nexus 7 Discussion Forums (1st Generation) => Nexus 7 Help => Topic started by: Maverickman360 on October 11, 2012, 11:06:12 PM
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When I first got my N7 (3 weeks ago) it had wonderful battery life. I could go 2-3 days with medium to heavy use just fine. Now that the excitement of a new device has worn off I am not using it as much.
The past couple of days I noticed a drastic change in my battery life. Now with minimal use I can possibly get 3 days at best. I have started keeping it in airplane mode and only turning on WiFi when needed but the problem seems to just keep getting worse. When I do charge my N7 it is over night so I'm not sure if maybe that was just taking a toll on the battery or what.
Any help or recommendations would be helpful. I have provided a screenshot of my power usage bellow.
Thanks,
Maverick
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Just to note. My battery was at 51% when I started typing that post. It is now at 45%.
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Whenever battery usage shows screen using less than 95%, I look at the apps that are running, and force stop the unnecessary ones. These battery hogs are typically Google data mining apps like media, maps, and Android system. One time it was Facebook, and after I closed that, a Facebook sub-app called Facebook.katana.
Your battery stats show some invisible process is using 30% of your battery. Run OS Manager to see what you battery killer is.
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Is OS manager a built in function? All I found on the market was is monitor. From what that is telling me, my CPU is being hogged by an app that. Have already deleted. It was an off market app so my guess is it left something behind when I uninstalled it.
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My bad. It's OS Monitor, as you deduced. Now you need to figure out how to stop that zombie application.
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No idea how to do that. Nice name though. I like it.
Anyone have any ideas? The only thing I can think of is a factory reset.
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Even if you can remove the apparent code left by the app, do you really want to trust, that their app did not leave behind a sniffer or other rogue code. My suggestion is to do a factory reset and be sure that it is gone.
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Can you check yours and see if there is one called system with like the picture? K used to have an app that had that name and symbol but it seems odd that it would be taking up the much of the CPU unless it was actually the system.
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Just saw your comment prime. I will probably end up doing that tomorrow.
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Mavericknman,
Yes, I have a system app with the same icon, & it uses ca. 5% of the cpu load. I've seen Android system take 30% of the battery usage in the settings graphic.
You can kill a process in OS Manager by tapping on it, and choosing "Kill Process," but I agree with you & S. Prime it's safer to do a factory reset.
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Alright well thank you guys for your input and I'll do that and put me results back up in a day or two.
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I did a factory reset and the battery life seems about the same but my battery percentage seems a bit fishy....
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Either you have a nuclear reactor powering yours or that is just wrong.
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What does OS Monitor show? Something is still hogging your battery,as the screen should account for 98% of battery usage.
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Is monitor does now shoe anything hogging up the cpu but I did just find this. WTH is Google services and why is it taking up so much battery!!!
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Can someone post a screenshot of their battery status screen for comparison?
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Here's my battery screen shot.
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and mine.
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And mine...
(http://i725.photobucket.com/albums/ww256/JayJ-1974/Nexus%207%20Forum/Screenshot_2012-10-20-05-27-17.png)
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And mine. :))
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My guess is that Google Services is a blanket for a number of processes such as file transfers, data streaming, speaker output, etc.
I suggest the OP go to > settings. > apps. Identify what's running, and force stop anything he's not actively using. I have had to do this a few times myself when Android has gone haywire.
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I have done two factory resets since this thread started and I have had no improvements. The second time I installed only very essential apps.
Could this have anything to do with the fact that my nexus is rooted? The only thing I can think of now would be to unroot and relock my nexus and see f it changes anything.
Thank you again guys for all your help.
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The rooting process changes nothing that would cause this to happen.
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Have you flashed a new ROM on your device. Jay J is accurate, in that when you root, no change will occur to your battery usage, however, when you flash a new ROM, a new kernel gets flashed also, which does effect the battery. During the root process, did you over clock the device, or mess around with the voltages at all?
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I am on stock ROM and kernel. I have never done any over clocking or voltage stuff.
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The problem is battery usage varies device to device and user to user so in all honesty comparing battery stat screens isn't really helping anybody, it can give an indication or sometimes help weed out a rogue application but because we all use our devices so differently and not only that we can use them differently ourselves each time we reach for them the battery stat screen isn't really going to shed much light on this issue.
It's a harsh thing to do but I would suggest backing up your devices internal memory and doing a factory data reset, then start installing a few important apps at a time and see how it goes. Time will tell...
EDIT- Just to add to the above and after reading your OP again, I use my N7 medium to heavily and I don't get 3 days out of it. Wi-Fi is nearly always turned on, I use MX Player to watch movies and play games like Horn and GTA3, post in here via Tapatalk but the usage my N7 varies hugely from day to day.
You mentioned you charge your N7 overnight, I do this with my phone and have no problems but I don't do this with my N7. Do you run the battery down before charging or do you charge it irrelevant of what charge it has remaining?
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I usually wait until it gets below 30%. If it is above that it is enough to get me through a school day. On the weekend however I usually charge it for an hour or so in the morning regardless of the battery. Unless of course it is like 80% or above. Or if at the end of the day it is below 30% I will charge over night. I have done a factory reset 3 times now and only installed apps I really need for everyday use and it may have helped a small amount but it is not noticeable.
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To add to JJ's explanation, to determine whether or not it is a rogue app, start you device in safe mode, then install the apps, one by one, and see if there is a marked change. This will give you the ability to rule out troublesome apps.
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What exactly does safe mode do? I will try that when I get home.
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Safe mode on the phone is similar to that on a computer. Basically, it opens an app free image of your device. This gives you a free slate to add your apps, one by one, and find a troublesome app. The cool thing is your not wiping your device, so when you get out of Safe Mode, your device is as you left it.
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Here's a link on how to boot in safe mode. (http://www.gottabemobile.com/2012/08/02/how-to-boot-the-google-nexus-7-tablet-in-safe-mode/)
Edit: I just tried this. It disables widgets, removes third party apps/widgets icons from the apps/widget screens, and leaves your home screen shortcuts available for running/testing.
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Bit of a noob so this may be a stupid question but how will safe mode let me identify rouge apps?
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Boot into safe mode Check battery usage. It should show screen using >90% of the battery. Refresh the display, run your favorite app for 5 minutes, and check your battery usage again. Repeat with your next app. Your rogue app will be the one(s) that drop(s) screen usage the most, down to 70-80%
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My apologies for not adding it earlier. Here is the link:
http://www.gottabemobile.com/2012/08/02/how-to-boot-the-google-nexus-7-tablet-in-safe-mode/ (http://www.gottabemobile.com/2012/08/02/how-to-boot-the-google-nexus-7-tablet-in-safe-mode/)