yashsingh1/xdaforums huggingface dataset:
[Nexus 7 General] Emmellar:
I must have a complete dud. Barely anything running appwise and only 2.5 hrs screen time. Ignore the 38% value on first screenshot as that was it after charging for a few hours having run completely flat in standby.

Its the same poor performance whether stock or xenon which is what I'm on now.

I'm pretty scunnered with this as its only 6 weeks old. It's a 32gb with 3g, UK. Problem is I bought it from someone so not sure how that works warranty wise. Regardless, it can't be right. Otherwise the tablet is an absolute delight to use!
[Nexus 7 General] TheFirstFishy:
19h 19min on the battery- 5h 56 min screen time

Tapatalk2 crash when I try to upload pictures, so this is the none-screenshot version.

I'm quite pleased with my battery lift. I'm stock and it can manage a day with my use of 4-6h of screen time.
[Nexus 7 General] bftb0:
@Emmellar

You might want to collect some similar statistics, but with WiFi only or 3G only (or both off while sleeping) to develop an idea about where the power usage is coming from.

I note that the screen-on intervals in your plot that your 3G signal is also comparatively weak. Generally, cell radios alter their transmit power depending on received signal strength (sometimes it is the tower commanding the cell radio based on cell's signal measured at the tower), and they have RF power amps that are capable of 2W output. That's pretty significant considering that the battery capacity is only about 4W-hr.

I'm not saying that is the trouble (esp. since the cell power consumed depends on activity level), but on a tilapia device (N7-3g) it is the first thing I would look at.
[Nexus 7 General] Emmellar:
@bftb

Thanks.

I am running xenon with pretty much nothing on except WiFi. I don't have anything syncing, no NFC, no GPS, no BT, no daydream, screen at the lower end of the scale. The screentime was spent playing bloons and browsing. The cell receiver was on. But that's it! The reason I switched to xenon was to see if that helps but its no better. No worse either mind. Someone else suggested I get wake lock so I'll run that and see what happens. I'll also turn off cell. What else am I missing?
[Nexus 7 General] bftb0:
We won't know for sure until you collect the data. No matter where the problem lies, you are forced to take a divide-and-conquer experimental approach to isolate the cause of the trouble. Toggling the cell radio off is just one place to start, but it potentially can use lots of power.

If you are sure you are going to be using WiFi, I don't see why you would leave the cell radio on. Using the Airplane mode toggle, you can turn both off together - and then re-enable WiFi only with the WiFi control so that it is the only radio running.

Also, if the tablet uses lots of juice while sleeping while all radios are off - that will eliminate the radios as a suspect(s). Turn 'em all off (GPS, NFC, WiFi, BT, Cell) for a couple hours while the table sleeps and check the battery drop. If that is the case, it could still be either a rogue app or some other hardware (motherboard, battery, or other?).

That Better Battery Stats app costs a couple bucks - I'm not sure if there is a cheaper way to measure wakelock usage though - or measure the deep sleep (LP0) percentage when you have the tablet screen turned off. There might be a way to check these things with a before/after inspection of files in /sys, but off the top of my head I don't know where to look in there.

One other thing you might want to look at is the nearly empty and 100% full battery charge voltages. Should be about 3.5v - 4.1v. I suppose that if the battery charger circuit (TI BQ74251) is not operating correctly - for instance only charging the battery through a small voltage range, it's "0% to 100%" range would then over-report the actual power dissipation.

Just out of curiosity, if you charge the device when it is turned completely off, how long does that take to perform a nearly full charge?

good luck
[Nexus 7 General] cesarmanilla:
Oh, sorry for the super late response, I was using NxtGen ROM 2.2 and InterSect kernel when I posted it. Now I'm using PA 3.15 with the same kernel and get around 7 - 7 and a half hours. Maybe I'll return to it (:
[Nexus 7 General] lebrac:
Rasbeanjelly with M-kernel @1.3ghz
[Nexus 7 General] Skyfall007:
only browsing>?
[Nexus 7 General] lebrac:
Browsing, tapatalk, 20 min streaming, a lot of video playing (mx player) and reading
[Nexus 7 General] chrisnewton:
I have about 44% battery life left and have 3 and half hours screen on time so far.... Does that sound Ok?
[Nexus 7 General] bftb0:
(1 - 0.44)* Pct_100 = 3.5 hrs, so - extrapolating: Pct_100 = 3.5/(1-0.44) = 6.25 hrs

It could be better than that if you were just reading with screen brightness turned down (say 8.5 hrs); it could be worse than that if you were gaming (say 4.5 hrs).

So since you didn't say what kind of load/activity you were using, I guess I'll say that No, it's not OK and Yes, it is OK. :p
[Nexus 7 General] chrisnewton:
Sorry yes was a bit vague, screen brightness is lowest and all I really do is surf the Web.
[Nexus 7 General] chrisnewton:
Just more convenient, I have never rooted my Nexus, I thought that was quite good battery life lol

---------- Post added at 06:03 PM ---------- Previous post was at 05:44 PM ----------

I am a now at 33% remaining and 4 and half hours screen on time.
[Nexus 7 General] cas_xp:
Airplane mode

not bad, but is not good as WM5
[Nexus 7 General] TheFirstFishy:
Sry , but what's the point with a tablet if it's not used?
[Nexus 7 General] cas_xp:
That is exact my point. If it is in airplane mode, it shouldn't consume any power (or less power).

My old WM5 device can last two months and battery is still around 60%.

BTW, my N7 touch screen is kind of broken and that is the reason I have this battery test.
[Nexus 7 General] TheFirstFishy:
Compared to my Xperia S my N7 only sniff to the battery. Even en airplane mode my Xperia S is getting raped by wakelocks.

But I can still only manage around 24h with my N7 with my current usage.
[Nexus 7 General] Icefeldt:
My HTC Flyer Tablet was literally able to be in airplane mode for weeks!

Sold it, bought the N7, and now I only get a few days in airplane mode.

WTF?
[Nexus 7 General] Soldier 2.0:
Nice! 4 days standby on 4.1.2!

Sent from my Nexus 7 using Xparent Skyblue Tapatalk 2
[Nexus 7 General] jonny68:
Excellent battery life on Xenon HD ROM
[Nexus 7 General] jonny68:
Isn't the whole point of having a tablet is to actually use it and not leave it in airplane mode.

The mind boggles :-\
[Nexus 7 General] Icefeldt:
...

Using the Tablet on friday.

Being away (outside in the real world) for the weekend.

Getting back @ sunday evening and the tablet is empty .... thats not a good performance.

Additionally: If the HTC can do this, why isn't the nexus 7 also able to do so?
[Nexus 7 General] Soldier 2.0:
Set the Wi-Fi sleep policy to never. Saves a TON of battery!!!

Sent from my Nexus 7 using Xparent Skyblue Tapatalk 2
[Nexus 7 General] Icefeldt:
wifi sleep --> never?

that would mean that Wifi is always on.

thats kind of the opposite of energy saving?!
[Nexus 7 General] ram130:
Don't even need to do this with the iPad...damn I don't want to buy one but battery life is really sub par on the n7.
[Nexus 7 General] Soldier 2.0:
Sorry, it is never keep Wi-Fi on while sleeping. I like it because when I turn on the screen I see which apps are updating and stuff.

Sent from my Galaxy Nexus using Xparent Skyblue Tapatalk 2
[Nexus 7 General] ncguy68:
Here are my Battery Screen Shots

After tinkering with Roms and Kernels for months I have found the best battery life with stock ROM and M-Kernel. With the kernel tweaked I average about 12 hours of On-Screen battery life. The best I have gotten is close to 14 hours (mostly reading with the brightness turned down low).
[Nexus 7 General] ram130:
You plugged it in at some point for a few minutes...so hard to say that overall screen time is good. It seems it more likely would be around 8hours.
[Nexus 7 General] ncguy68:
When its plugged in the count resets. You can easily get 12 hours by simply turning off cores and underclocking.
[Nexus 7 General] ram130:
I'm using the m kernel so not seeing good stand by drain. What did you disable in stock?

I know but it only resets when you charge it 100%, I was saying you charged for a hour or less, so it went up a few % hence the graph showing a little upwards trend. Check the picture and you'll see. I've done it too so I know lol.
[Nexus 7 General] ncguy68:
I have two CPU cores disabled and I have the other two underclocked. Most of the time I use 1ghz, but if I am reading or doing something lite I take them down to 500mhz or 800mhz.

In stock ROM I have background apps set at 4 and I have stopped some of the Google apps from running.
[Nexus 7 General] ram130:
Thanks so much for the info. Awesome stuff. I wont be underclocking though, well not sure how lol and I kind of like my N7 to be lag free as possible. But good to know.

The background apps down that low would affect my multitasking at times but that actually sounds reasonable to do. And it seems Google is still not focus on battery life since most of the drain comes from their apps. Either it's Google Currents or Google Maps draining battery. I realize Google Maps has a option to disable auto updating and that made a huge difference in stand by battery life for me. It also let me keep Google Now.

Thanks again.
[Nexus 7 General] ncguy68:
I use an app called Trickster Mod to make custom changes to the kernel. It can be used to adjust the cores and clock speed on the fly.
[Nexus 7 General] americanflesh:
Using cm 10.1-rc4

Battery usage is excellent compared to cm10.1-rc2

Sent from my Nexus 7 using Xparent Cyan Tapatalk 2
[Nexus 7 General] eliboy:
Media server is the best. ("Server media")

I charged full at 23 to make a record. At 6 in the morning the tablet was hot, like i played on it. Not to mention tat half battery was gone.

Can i do something about it? From that day, media server is a second class citizen for battery usage, first is the display. :)
[Nexus 7 General] dexviajiboy:
Sent from my Nexus 7 Grouper
[Nexus 7 General] fileexit:
Is this normal, battery history shows that I get some free charges every now and then :laugh:
[Nexus 7 General] digitalbot:
looks like im in need of a new battery :p

doesnt even hold charge hahahaha
[Nexus 7 General] dexviajiboy:
My result on PA SaberDroid

Sent from my Nexus 7
[Nexus 7 General] H4CK_H0PP3R:
Sent from Nexus 7 3G using XDA Premium @ Indishell Lab
[Nexus 7 General] H4CK_H0PP3R:
Is my battery is defective ?

Sent from Nexus 7 3G using XDA Premium @ Indishell Lab
[Nexus 7 General] dexviajiboy:
how you feel on your hand? or battery monitoring not accurate? try do battery calibration -100% charging.. monitor 1st cycled SOT

Sent from my Nexus 7
[Nexus 7 General] dexviajiboy:
btw how your SOT?

Sent from my Nexus 7
[Nexus 7 General] Nando77:
Battery drains

Hi, I have a N7 3G with androido 4.3 stock.

I watch that my battery drains very fast although 3G and Wifi are turn off.

Please see us the screen shots an tell me abuot for fix it.

Thanks
[Nexus 7 General] veeman:
It could be just a bad app that you installed. Get Greenify, and greenify apps that are running in the background that you don't want running. And uninstall the crap apps.
[Nexus 7 General] Salty Wagyu:
Yeah it does tend to stay at 100% for longer than usual for me as well, probably not reporting capacity accurately.
[Nexus 7 General] azoller1:
A little off topic, but anyone know the best battery saving app?
[Nexus 7 General] barisahmet:
for those who says nexus 7's standby time is bad. 3 days and 3 hours of screen time and 50% battery left. watched a movie, surf on the web while streaming spotify. I say amazing.
[Nexus 7 General] jabsys:
I've noticed that a few times on mine, it seems to get stuck on 100% but once it starts moving it seems to drop normally.
[Nexus 7 General] Caifan09:
Here is my screencap... Using Jr6 MCR Rom

[/URL] Uploaded with ImageShack.us[/IMG]
[Nexus 7 General] rockaholic112:
Cm10 kang with der kernel at 1.6 GHz.

Sent from my oc'd cm10 nexus 7
[Nexus 7 General] 1993cb7:
Here is mine.....

Not to bad....been gaming and surfing the web.
[Nexus 7 General] clago87:
Here is mine heavy screen staring
[Nexus 7 General] :
Winner CM10 rom

Sent from my Nexus 7
[Nexus 7 General] jphilippon:
Turn off the option in developer options for tilt scrolling. Might be what is using your battery under Chrome.
[Nexus 7 General] regalpimpin:
Stock rooted

Quite a bit of real racing 2, xda, and browsing
[Nexus 7 General] AraDreamer:
Been reading fan fiction and listening to Cirque due Soleil and Nickelback. Amazed it lasted this long on stock rooted. -Ara
[Nexus 7 General] vboyz103:
Here's mine with motley kernel -50mV undervolt and 1.6GHz overclock, with screen off profile using System Tuner
[Nexus 7 General] :
Sent from my Nexus 7
[Nexus 7 General] azoller1:
We should have like a competition on who can make their tablet last the longest!!
[Nexus 7 General] Capt.PP:
Then, everyone would just left their Nexus 7 idle until battery almost died to take a snapshot.
[Nexus 7 General] barisahmet:
Almost 4 days with 5.5 hours of screen on time. I say good.
[Nexus 7 General] sjankis630:
That is the problem. There are several on this thread that are posting their time on the battery without posting the screen time on. For me, without the screen time to tell how much you were actually doing something with the device - and not just having it on idling - then it really doesn't give a true battery picture.

I have been getting both ends of the spectrum. 5.5 hours some days and then others having the device give me battery warning at slightly over 3 hours. This is just surfing the web mostly too.
[Nexus 7 General] anilpalepu:
So true !!! Post the screen time on people.. not the idle time trying to show off how long the battery lasted.. people are posting as if this is some competition.
[Nexus 7 General] :
Just wanted to reiterate the reason why I opened this thread:

Just wondering what kind of battery life you guys are getting out of this magical device. Post your screenshots! **Please include one for overall and one for screen on time.

*Hold power and volume down buttons to take a snapshot of your screen.

Sent from my Nexus 7
[Nexus 7 General] anilpalepu:
Rooted and on stock ROM...

Doing nothing much other than browsing with flash and using xda app..

Screen on time is close to 6hr 30min with 10% battery left.
[Nexus 7 General] azoller1:
Couldnt wait till 1% could of done better though...
[Nexus 7 General] Responsibility:
Stock.
[Nexus 7 General] ragmanchu:
Watching most movies locally and over youtube with browsing and some gaming.

Rom - Team EOS

Kernel - DerKernel
[Nexus 7 General] smirkis:
love this device. live it!
[Nexus 7 General] simms22:
so far this cycle, and with a misbehaving tweetcaster app too(just solved the app problem)..

(trinity kernel with aosp)
[Nexus 7 General] ram130:
My maps and Android OS is waking up my device a lot. Anyone else? Is there a fix?
[Nexus 7 General] veeman:
Was using it as a GPS for a bit then played some games. Now on Tapatalk.
[Nexus 7 General] shahkam:
Im listening alot of music and i haven't picked this up yet but will do soon enough,

I just wonder does it drain alot while listening to music whit screen off ? Didn't felt like opening a new thread

PS: Sorry for off-topic.

Cheers,

Sent From My Sexy Sensation.
[Nexus 7 General] shamo42:
Stock ROM and stock Kernel still gives me the best battery life.

9 hours on screen time over almost 5 days.
[Nexus 7 General] :
Listening to music with screen off does not consume a lot of power.

Sent from my MB860 on MROM
[Nexus 7 General] jaydon34:
So far so good. Battery life just as good as my iPad 2
[Nexus 7 General] FallN:
What battery meter program are you using to display battery percentage in the Task Bar?
[Nexus 7 General] :
That's a custom ROM. It is called CM10 and there are many other customizations besides showing a percentage on the task bar. Your device has to be unlocked to be able to load a different firmware. This process requires some studying of the subject before you begin. If you have never experimented with this it is very easy to break or "brick" your device.

If you just want a percentage indicator I recommend "battery circle" app. It used to work for me on Gingerbread, but I do not know if it is Jelly Bean compatible.

Sent from my MB860 on MROM
[Nexus 7 General] parmend:
Man I'm lucky if I get 5 hrs of screen on time .
[Nexus 7 General] FallN:
Thank you! Not ready to play around with custom ROMs so I'll check out that program. :thumbup:
[Nexus 7 General] nini8:
I am a little bit disapointed, less than 6 hours of surf with minimum screen brightness... how do you get so much battery life ?
[Nexus 7 General] :
Best way I found to get a huge increase in battery life is disable Google Now.

Open Google Now, tap menu, select Google Now from the list, top right corner of the screen switch to off. Fiable location history box at the prompt.

To get even better battery life, disable Gps, location services, and Google Search location detection.

The latter tips are a bit more extreme, but I guarantee you will get a huge gain in terms of overall usage time.

Sent from my MB860 on CM10
[Nexus 7 General] nini8:
I already disabled all location features. I'll try without google now then...

Thx anyway.
[Nexus 7 General] shamo42:
-Go to settings -> your google account and turn everything off you don't need. Like location history or photo sync.

-Don't use too many widgets on your homescreen, preferably none

-Go to wifi settings and set wifi to be only enabled when the screen is on.

-Disable automatic brightness and set it to the lowest setting that is still bright enough

-Use Dolphin Browser instead of Chrome. IMO it's more battery friendly. Disable the shake feature in Dolphin settings.

-Turn of GPS when you're not using it

-Custom ROMs or Kernels might decrease battery life. Stock works best for me so far.

-Games will dramatically decrease battery life. Don't play if you need longer battery life.

-Go to settings, apps, all apps and disable software you don't need (for me google chrome, email, google earth, google movies,...)

-Go to settings, developer options and turn off all animations

-Go to settings, backup, and disable backup

-Don't use live wallpapers

Not sure if this is any good but it might help:

-Install Nova Launcher, disable or uninstall the original Launcher. Go to Nova Launcher settings, disable reporting and install the latest beta. Disable all animations in Nova Launcher settings.

Edit: I forgot sth. Disable NFC if not using it. Go to Settings, more and disable it.

Enjoy 9 hours of battery life.
[Nexus 7 General] :
Thank you for your detailed post. I'm sure a lot of us will follow your advice. Peace.

I included your tips on the second post.

Sent from my Nexus 7
[Nexus 7 General] FallN:
12+ hours and still have 25% battery left!

- WIFI on entire time

- Bluetooth on and connected to headset for approx 6 hours

- NFC on entire time

- Screen brightness on lowest possible setting

- Heavy web browsing

- Heavy video streaming via Play Movies and YouTube

- Played "Dark Legends" MMORPG (WiFi game) for about 1 hour

- Moderate eBook reading

- RSS reading using Pulse, Flipboard and Pocket

- Light emailing

- Light text messaging using Google Voice

I really wanted to do a full battery test with insane usage to see how long the battery could last.

This tablet is a beast! The most battery life I've ever gotten out of any device with constant usage for 12+ hours!

The device rarely went into Standby! I was using this device everywhere I went. I even soaked in the bathtub while reading an eBook on it then streamed videos-- WiFi and BT blasting the whole entire 12+ hours!

Just outstanding performance. I'm a very happy camper. :D

---------- Post added at 11:12 PM ---------- Previous post was at 10:59 PM ----------

More than 12h 35m and only at 21%!! :thumbup:
[Nexus 7 General] exzacklyright:
(2 hours total of games)

How!!
[Nexus 7 General] noneabove:
Stock??? :S
[Nexus 7 General] gogol:
That is quite impressive ...

I saw in the middle, there was no wifi ... and it was awake with screen on.

What was going on during that time? Tethering? :)

And I don't see much other activities except some kind of browsing?
[Nexus 7 General] shamo42:
Yes, I was bluetooth tethering which seems more battery friendly then wifi tethering (for both devices).

The browser used is dolphin browser. As I said before I think it's a little bit more battery and RAM friendly compared to chrome.
[Nexus 7 General] :
It appears that something went wrong with your screenshot?

Sent from my MB860 on CM10
[Nexus 7 General] FallN:
Yes, everything STOCK.

I have not tweaked, unlocked, rooted or hacked anything... Yet, lol. :)
[Nexus 7 General] :
Nexus 7 is now officially supported by the cyanogenmod team. :D Nightlies have begun.

Sent from my MB860 on CM10 (Epinter)
[Nexus 7 General] 1iam5mith:
Didn't seem to upload the image :(
[Nexus 7 General] swolebiceps:
Might want to try juice defender/auto airplane mode. I use them and have no issues.
[Nexus 7 General] jmikeb92:
Just picked up my nexus. This is from today. Used it on my two breaks and hour lunch at work. A little when I got home. And have been power using it for the last 5-6 hours. How does it look like I stack up? I did notice that even when I have WiFi turned off during sleep it still shows that I have it on in the battery usage display. Any thoughts?
[Nexus 7 General] Freshtojeff:
Does this seem to stack up well?
[Nexus 7 General] Dkesler76:
OK how do u do screen shot sorry for the noob question :rolleyes:
[Nexus 7 General] Freshtojeff:
Hold down both the power and vol down button together.
[Nexus 7 General] jarsh92:
Cm10 with faux kernel.

Screenshots not working.:confused:

2 days 5 hours 30 mins on battery

Screentime 5 hours 20 mins.

15% battery left.
[Nexus 7 General] gamesmaster20:
Quite pleased with these batter stats, a lot of the time was spent using the Kindle app to read a book but some browsing and a bit of gaming as well.
[Nexus 7 General] N0J:
completely stock. :D :thumbup:

Sent from my Nexus 7
[Nexus 7 General] jamesst20:
Anyone have tried to lower CPU frequency to 500MHz and lowest screen light how long it last?
[Nexus 7 General] kurigowa:
Stock ROM trinity 50 alpha
[Nexus 7 General] mouse_man:
Stock ROM, Rooted. Just basic website browsing, emails, etc. Nothing too taxing.
[Nexus 7 General] dirtyhamster73:
Stock.
[Nexus 7 General] tmayo47:
Glazed ROM faux kernel.
[Nexus 7 General] imapirate:
I assume you have it set to sleep WiFi when the screen is off, or device is asleep?

Mine is stock, maybe I should do the Root thing everyone seems to be doing.
[Nexus 7 General] Daniel.Infante:
My battery drains very fast.
[Nexus 7 General] Duvuk:
After one charge, not rooted and still locked
[Nexus 7 General] :
Those are some impressive results you got there guy!

Sent from my Nexus 7 on official CM10
[Nexus 7 General] ashclepdia:
How fast? What u use it for?

I do some heavy gaming, browsing, well, EVERYTHING.

Usually average 5hr screen on over bout ten hours with VERY heavy usage.
[Nexus 7 General] iucidium:
Partial charge - fail.
[Nexus 7 General] lanwarrior:
Stock, rooted. Is this normal?

I have 3 Gmail push account, Touchdown app for Exchange (email, calendar), Plume app for Twitter (30 min refresh) and DropSync every 6 hours.
[Nexus 7 General] Duvuk:
That is including putting it into air plane mode with WiFi off during the day (no case yet,so not taking it to work) and the same over night.

Charged it last night and now going to leave it on WiFi all day at home and see how it goes. I'll post my results when its around 5% left
[Nexus 7 General] :
Get rid of touchdown and your results will improve.

Sent from my MB860 on CM10 (Epinter)
[Nexus 7 General] micwill:
Had mine the first day and being really impressed, 8h plus screentime while using it the whole day surfing and reading and listening to music...
[Nexus 7 General] lanwarrior:
Any suggestion for replacement Exchange app? This is the only that works with Pure Calendar Widget to show BOTH Google Calendar AND Exchange Calendard in ONE widget.