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2012 Nexus 7 Discussion Forums (1st Generation) => Nexus 7 Help => Topic started by: emmellar on April 03, 2013, 03:13:02 PM
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My battery life is terrible! Not running any background apps and Bluetooth off. This is a 32 GB with 3g. Any thoughts welcome but I think I have a dud on my hands >:(
(http://img.tapatalk.com/d/13/04/04/8yje3eta.jpg)(http://img.tapatalk.com/d/13/04/04/6ede6y9a.jpg)(http://img.tapatalk.com/d/13/04/04/9epaquze.jpg)
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Almost looks like a junk battery...
Sent from my SCH-I200
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Almost looks like a junk battery...
Sent from my SCH-I200
Did you get 8 hours of use before you started charging? How bright do you have your screen set at? Did you just notice a change in battery life under the same conditions of use? How many hours of your use are you getting from a full charge compared to what you are saying is poor?
Why do you say it almost looks like a junk battery? There are a lot of variables that are or could be in play before its narrowed down to a hardware issue.
Sent from my Nexus 7 using Tapatalk HD
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Looks like you got only 2 1/2 hours of actual use (screen on). Most of the drain was the wifi and mobile staying on while the tablet was supposedly asleep. I don't have the 3g but in settings, wifi, menu, advanced, you can set the wifi to turn off when asleep. As far as the awake spikes while the screen was off, turn off auto sync in currents, locale, weather etc. On google play is a program called 'wakelock detector' to help track those down. Look at the partial wakelocks (screen off activity).
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I am a little confused with the numbers. You have 38% left but it is charging. It says you had 8 plus hours of use and 2 plus of it was the screen being on. How much actual percentage of battery was used while you were using it for games and whatever. Like Matt suggested. Be careful of apps syncing in the background and take more control of things running while the machine is asleep. Live wallpapers, daydream and such. I disable NFC as well. Is your screen brightness turned all the way up?
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The 39 % charge is because when the tablet got to near 0% it shut down or was turned off. Then it was charged to 39, booted, and the screen shot taken. Notice the vertical spike on the charging graph, when asleep that would have been a gradual rise.
I believe the 2 hours and 29 minutes on the second screen capture was his actual use. Plenty of battery posts on this site, tracking these suckers can get aggravating.
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My head spins when trying to figure out these battery equations.
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I suspect a dead battery because of the battery getting so killed while the 7 is sleeping... as if the battery isn't charging fully or misreporting it's status.
It could also be a very poor Wi-Fi connection... a good strong WiFi will sip juice, but if the signal is weak, it visits the signal.
Try this: charge it fully, put it in airport mode, and leave it with the screen of... if the battery doesn't bleed, it's your 7's WiFi... if it still kills it, there is some other source
Sent from my SCH-I200
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Thanks for all the comments. Yep matt is right about the 38% thing.
No auto sync on anything and I am running things stripped back I.e. no current, no daydream, basically nothing that runs in background - I'm a bit OCD in that respect! I have since posting installed wake lock, turned off 3g and left it in sleep. Below is result. Not sure what it tells me except why is mobile signal still shown?
:-\
I will try WiFi off in sleep now and see what drain down is like.
(http://img.tapatalk.com/d/13/04/05/maruze2e.jpg)(http://img.tapatalk.com/d/13/04/05/evame4e7.jpg)(http://img.tapatalk.com/d/13/04/05/sadarehy.jpg)(http://img.tapatalk.com/d/13/04/05/4utenahe.jpg)
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Did this just start to occur ? Hate to mention the word hard reset but sometimes these battery issues call for one.
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I got it second hand last week. Six weeks old and as new. However who knows how it was initially charged and discharged...
What do you mean by hard reset? I have flashed various ROMS to see if that would help and have done quite a few factory resets through clockwordmod recovery bootloader...is that the same thing?
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Have discovered that turning mobile data off does NOT turn off the actual cell signal. Which is why the signal bar is continuously on in the last set of screenshots. However if I turn on airplane mode and then WiFi back on this kills the cell signal while still letting me browse in the house! Not exactly slick and shouldn't need such intervention but let's see what that will yield battery consumption wise before I turn WiFi off also.
:P
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Not really seeing why the tablet was waking when the screen was off. Do you have your apps set to auto-update in play? Notifications for email, messages, google voice? The router may need some config if it is constantly reconnecting.
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Getting somewhere. See screenshot below. This is after switching into airplane mode, turning wifi off when asleep and thgen putting to sleep for the last hour. Play update was always off and dont have voice or messaging apps installed. All mail syncs turned off.
(http://img.tapatalk.com/d/13/04/05/esu2uqep.jpg)
Sent from my Nexus 7 using Tapatalk 2
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I think you've done it. There's an app called battery widget reborn several on this site recommended. You can set a 'night mode' that turns off background sync and all the radios. It allows mine to consistently fast charge and gives some useful battery info. I'm buying it when the demo runs out.
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If still having problems..
Second hand. I would definitely do a factory reset. It will be like taking it fresh out of the box. Who knows what was installed by the last owner unless you know first hand. You will lose your data and have to reinstall apps but when you have a problem like this it isn't the worst thing. It makes it easier to troubleshoot adding a few apps back at a time. If you have any documents or things that you need I would save them either in the cloud or on a PC and just start fresh.
Factory reset. in Settings menu /Backup and Reset/ reset tablet
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Matt.....Not quite.... WiFi and mobile signal off but still awake in sleep mode and wake lock not showing anything up that matches the durations of waking??.....
Bjs229..... I have reset it so many times when flashing roms but no difference. Is that the same thing?
Anyone know what the two main services that are running are? I don't have Google talk installed and why would connectivity services be running???
(http://img.tapatalk.com/d/13/04/05/e2e8ydyt.jpg)(http://img.tapatalk.com/d/13/04/05/paha8ama.jpg)
(http://img.tapatalk.com/d/13/04/05/a5u9e2am.jpg)(http://img.tapatalk.com/d/13/04/05/8aqamabe.jpg)
Sent from my Nexus 7 using Tapatalk 2
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I use the stock ROM but I am not sure if adding a customROM wipes your whole device like a system reset. A reset brings you back to the last update totally clean . might be worth a try if you are backed up ..you can always flash a backup in recovery.
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Looks like your wifi was staying on until you started charging. No, I was seeing it wrong, let the graph reset after a day. Did you st wifi while asleep to 'never', or 'only when charging'?
You're already ahead of me on the wakelocks, is gtalk implemented as part of google +?
Connectivety,I'm guessing, has to do with wifi update syncs. Double check locale and maps for location reporting sync.Try disabling google+ temporarily. I've disabled 'currents', no loss.
Looks like the (x523) numbers are iterations of each wakelock? What we need is a big red button that puts the tablet to sleep!
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Quoted by Matt
Looks like your wifi was staying on until you started charging. No, I was seeing it wrong, let the graph reset after a day. Did you st wifi while asleep to 'never', or 'only when charging'?
You're already ahead of me on the wakelocks, is gtalk implemented as part of google +?
Connectivety,I'm guessing, has to do with wifi update syncs. Double check locale and maps for location reporting sync.Try disabling google+ temporarily. I've disabled 'currents', no loss.
Looks like the (x523) numbers are iterations of each wakelock? What we need is a big red button that puts the tablet to sleep!
I use GVoice a lot.It is a separate app.I believe Google messenger is part of G+.
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Doesn't airplane mode pretty much put it to sleep?
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Airplane just shuts off radios. Other events, like alarms, or media servers and indexing or other background programs can still keep it from true sleep.
I'm playing with 'power toggles widget' a customizable control set on the home screen. One of the toggles I have set to lock the screen and turn off wakelocks. The 3g toggle may work, can't try it.
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The way I look at it.
I let WiFi run 24/7.BT speaker is on. GPS on.screen set to minimum viewing comfortability. I run videos constantly in the background when in bed and I get a good 7 hours or so before I need to plug in. Struggling for juice with this thing like it is a first generation smartphone points to some sort of issue. Usually not hardware.
From what I have read , When there are screwy readings or unusual hidden apps or processes running it usually means it it time for a factory reset to calibrate things and start anew.
Google Now cards use up some battery as well. I have quite a few of them. Not sure how often they sync. Widgets.
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When I say reset I mean wipe everything and go back to stock. This is one of the reasons I don't install a bunch of different Roms. Remnants happen sometimes and screw things up behind your back. Then you need to know how to start from a clean green slate.
When you bought it second hand was it from a store or a CL type of thing ? Was it reset to stock when you bought it? Meaning did you have to go thru the setup wizard?
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7 hours with wifi? I'm lucky to get 3. Time to hook up a new router! It may be resyncing too much. Thx bjs.
Yesss 4ft. from router and dropped 2% in 1 hour with wifi on. Almost like there's a low power mode with a strong enough signal.
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Thanks for all comments. It was bought privately and was stock. It was reset in front of me before handing over.
OK here I am now with following setup. System panel pro to check usage, airplane mode on to switch off cell signal and WiFi then turned on to give me back my web access, all and I mean all notifications turned off as I am not a heavy social app user. Things are definitely better but I'll run it a couple of days and post back results. Just about everything related to Google has been turned off because if find it far too intrusive. All that is left is Google play!
By the away I use the xenonhd ROM and I have to say it is really really good. Very stable, very fast and very professionally finished.
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Were you noticing these same battery problems when you first ran the stock ROM?
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Nope... ours is bone stock and it has really good life. It sips power when off and really only burns through a charge if my daughter gets hog wild with games. It has burned through a charge once or twice, but that was a runaway process that did it.
Sent from my SCH-I200