yashsingh1/xdaforums huggingface dataset:
[Nexus 9 General] Gormsen:
I tried using chrome beta yesterday, but didn't see much improvement. Instead I'll be using Dolphin browser today, to see if that makes a difference.

Thought the same when I read about the WiFi bug. Google says that its only affecting the Nexus 5, but they're not really sure.

If anybody is rooted, you should head over to Usbhosts kernel thread, he has posted some commands to reduce the interactive governors aggressive CPU ramping.

Smashed down on the mighty Nexus 9
[Nexus 9 General] USBhost:
Haaaa!!!

The battery is lasting to long on this thing

Well i guess thats what i get

When my n9 is pluged in to a computer all day

testing kernels you know

And netflix doesn't seem to use the battery much
[Nexus 9 General] StuMcBill:
Well, after losing 30% with just over 1 hour screen on time, i have just wiped and started again!

I am going to update the stock apps from the play store and not install anything else! See how it goes!
[Nexus 9 General] laill:
I am thinking if my device has some problem.

Apart from my battery performance, I am having some random lag, lag unless I reboot:(

Hope it is not a hardware problem.
[Nexus 9 General] cmit37:
It looks like some application is preventing the tablet from deep sleep. I would do a factory reset and have a conservative approach to installing apps until you find the one that is causing the problem
[Nexus 9 General] Gormsen:
I don't have any problems with deep-sleep. Though I did lose 2% over night.

Today I got 2h SOT and 81% left, so idle drain isn't the problem. (If you want I'll post screenshots later, but I'm currently at work.) I think Usbhost is on to something when he says that it's the touch boost that is way too aggressive. That along with poorly optimized apps (Chrome I'm looking at you!) ;)

Message has been Baconized
[Nexus 9 General] StuMcBill:
Seems to be performing much better after a fresh wipe!

Just over 3 hours SOT with 40% starting percentage!

Will start installing apps again tonight!
[Nexus 9 General] di11igaf:
The problem with that could be lag. Pretty sure that was a part of project butter, along with some vsync changes and how it buffers inputs. I don't have my 9 with me but what governors are included with the stock kernel? If you really want to save battery by not letting the CPU scale to max frequency, use the conservative governor, (may need to recompile the kernel with conservative included in the defconfig) but its probably gonna lag due to how it scales. On demand by default will basically scale right to max frequency when a certain load is hit, conservative will do it in smaller steps.
[Nexus 9 General] USBhost:
su

echo 3000 > /sys/devices/system/cpu/cpufreq/interactive/above_hispeed_delay

echo 1020000 > /sys/devices/system/cpu/cpufreq/interactive/hispeed_freq
[Nexus 9 General] Gormsen:
I thought Google switched out Ondemand in favor of Interactive?

Not interrested in trading performance for battery. I know that there's always a tradeoff, but at this point I think there's a lot of optimization to be done, which would benefit both performance and battery.

Regarding this discussion: How are you finding these settings, do they improve battery and what's the impact on performance?

Smashed down on the mighty Nexus 9
[Nexus 9 General] USBhost:
There is a performance loss i wont deny that

But the impact is not much. you hardly notice!!

Battery is better and less heat

I first tested with trixter mode

Then i just went a head and found the settings manually
[Nexus 9 General] di11igaf:
They did. I was just saying on demand probably won't be much better battery wise than the default interactive because they are both gonna scale instantly to top freq.

Those are tweaks to the governor, can't speak for usbhost, I'm not sure what the stock settings are so I'm not sure what they're being changed to, its just the interface to change how the governor scales the frequency up, down, and how long it keeps the speed up or down. Google some of the governor settings and what they do, there's a lot and each persons performance\batery ratio will be different.
[Nexus 9 General] Gormsen:
Okay, I might wanna give it a try, once I pull myself together and root this bastard ;)

I know what the settings do. I can't help feeling that something is up with this kernel, along with the interactive governor..

Google released an update just before the N9 got released which was supposed to fix some performance and battery issue, and I think that they're not quite done yet..

Smashed down on the mighty Nexus 9
[Nexus 9 General] StuMcBill:
Anyone else installed gsam battery monitor? Mine shows negative mAh??
[Nexus 9 General] Gormsen:
Its probably not fully compatible yet with Lollipop :)

Message has been Baconized
[Nexus 9 General] USBhost:
Try Elixir 2
[Nexus 9 General] beetmonger:
I have it installed. Seems to be working normally. It just updated for lollipop the last day or so.
[Nexus 9 General] oldswe:
In my case the trouble source is the webbrowsing .

I get 5 to 5 1/2 hours sot when mainly webbrowsing. When watching Videos or playing games I get 7 to 8 hours sot.

I used chrome and cm Browser no difference in the result.
[Nexus 9 General] addicted1900:
Maybe the WiFi connection is the culprit? I've read somewhere that there was battery drain in the previews caused from the WiFi. I really don't know why my sot is so Bad. Can't get over 5,5 hours with really Basic tasks like reading PDF and Browsing.

Gesendet von meinem Nexus 9 mit Tapatalk 4
[Nexus 9 General] kruso:
What's your brightness level?
[Nexus 9 General] addicted1900:
0% as i use it indoor.

Gesendet von meinem Nexus 9 mit Tapatalk 4
[Nexus 9 General] bennyboy_84:
Here is what my battery looked like after exactly one hour of moderate to heavy use (browsing, downloading a few large files, playing a few games for total of 10 minutes or so, auto brightness on, Wi-Fi on, Bluetooth off). This was my 3rd full charge cycles or so. It might have gotten better after a few more cycle but since I have this (4 hours of sot or so) and light bleed, this thing was sent back to Google for refund.
[Nexus 9 General] LinS123:
Auto brightness is not your friend. It jumps up and down for me constantly. I've been getting around 7-9 hours of usage out of my 9, with Netflix and YouTube usage. Seems to me that there's some sort of issue with Chrome and the WiFi connection in general that drains the battery very quickly. Browsing the Web ramps up the CPU usage and heat which kills my SoT. So there's more optimizations to be had.
[Nexus 9 General] jaju123:
Does using another browser help with internet browsing battery life?
[Nexus 9 General] oldswe:
I used cm Browser instead of chrome -> same result
[Nexus 9 General] mcdevtingz:
Yup, I have terrible battery life, compared to the Nexus 7 i still have.

If they manage to fix it and brought a bloody case for it I would love this device, its amazing to use, I can live with the poor build quality.

Battery is still poor on standby so there must be some kind of bug
[Nexus 9 General] Gormsen:
That's the theory ;)

Been using Dolphin, and I get much better results. Currently trying out Firefox :)

Smashed down on the mighty Nexus 9
[Nexus 9 General] scubastevegk:
Not particularly thrilled with <4 hours screen time, with what I would call pretty light usage. Web browsing, Twitter, and email. Battery drops at a significant rate when the screen is on. Seems like too steep of a decline to me, but am I wrong? Also, I'm concerned about the gaps in the graph. Never seen that on any previous device I've owned except when it was off or rebooting.
[Nexus 9 General] Gormsen:
As we've been discussion, Chrome ramps up the CPU like crazy when browsing, so try using a different browser. Right now I'm heading for 5 hours SOT with lots of heavy Real Racing 3. With normal use I can stretch it to like 9 hours (see my previous posts).

Read the thread for more ideas and theories as to why you're getting crappy SOT ;)

Smashed down on the mighty Nexus 9
[Nexus 9 General] scubastevegk:
Thanks for the reply. I did read the entire thread, and I'm certainly going to try other browsers. I was only contributing my graphs as additional data points, for two reasons. My decline rate during periods of screen on seems to be more rapid than most, and most of the graphs in this thread did not have large gaps in the data, so I wasn't sure if the information would be useful to anyone. Sorry for the inconvenience.
[Nexus 9 General] smb209:
I was pretty disappointed with the battery life yesterday but after another full charge it seems to be improving. Two hours of a movie streaming from Google play at medium brightness and another two hours of misc usage and still at a respectable 53%. Total SOT 3:57
[Nexus 9 General] Scotlac:
My battery life seems to be getting better. The first charge only lasted about 5.5 hours but this one (4th cycle, I think) looks like it could make 7.5, maybe 8.

I'm now using Chrome Beta which seems to cause less overheating issues while browsing.
[Nexus 9 General] Migamix:
OK everyone, as we should all know by now, and a sock took the time to explain recently

SOT DOES NOT EQUAL battery life. show the wake lock time of your top power consuming app, then this will be a little more clear. if you are having a wake lock issue with an older app, freeze it and wait for the Dev to update.

as for out of the box battery, mine was low on first initial cycle, I put it on the charger overnight, and into most of yesterday,then unplugged it about 24 hours ago.. I've been using it normal all day and I'm at 70% with about 200 apps installed, about 15 apps in recent (slid a few away recently) , YouTube, chrome, chat, rooted, busyboxed. the battery life should be reflective of your use, not your screen on time. lets get off that bandwagon.

if you are buying an inexpensive device and expect the world, you a) may be too young to remember pagers, b) never had to survive without a computer or cell phone , let alone both that can fit in your skinny jeans. if you are that disappointed and want to return it, then do so. posting screens of SOT does nothing to resolve what really may be dragging the battery down.

kids today, I tell ya.
[Nexus 9 General] ÜBER™:
First discharge and I'm unsure how I feel. Giant screen with a behemoth battery to boot and still only manages 6hrs SOT? And partially only because I watched a movie. I'm sure custom kernels will sort this out, it felt warm even when performing light tasks.

But here are my stats.

http://imgur.com/znJGxhG

http://imgur.com/VVwmoN5

http://imgur.com/YoNfcWn
[Nexus 9 General] Badouken:
So I've been testing the battery life for about a week and on average I get 5 hours of screen on time with moderate use. The best I ever got was 5 and a half hours of screen on time and that was with gaming/videos/browsing with the display at 70% adaptive brightness. The worst I got was 4 and a half hours of screen on time and that was with all syncing off (even Google), 20% brightness and all I did was browse the internet on chrome... no idea how my battery life got an hour worse... if anything I was expecting 7 hours of Screen time with those settings... sorry I dont have any screenshots to share but that's what i've experienced so far... makes no sense...
[Nexus 9 General] accordex:
Does anyone have an explanation for the insane amount of time this thing takes to charge?

I've taken it all over the house, and tried it on different chargers.

Why does my LG G2 take less then a hour with its 3000mah battery to get from 5% to full, and this tablet at 6700mah took !!4 hours!! to get to full starting from 41%?
[Nexus 9 General] bhu1:
Multiple users have mentioned that the charger included in the box has very low output level, also that its the same charger as the one HTC uses for the One m8. U should probably buy a 2.1 A output charger.
[Nexus 9 General] Gormsen:
This thing has a massive 6700mah battery. That along with a charger which only has an output of 1.5A equals slow charging. My OnePlus One has a 2.1A charger and a 3100mah battery. Takes about 1.5 hours to fully charge.

Smashed down on the mighty Nexus 9
[Nexus 9 General] asdf123101:
My battery drops quickly in deep sleep. I unplugged it last night in 11 pm and played with it for like half an hour. Then left screen off at 93% until I get back home just now. The battery now is 58%! Is anyone has an idea about whats wrong? Mynexus 5 with preview is fine. With almost same settings it's 73% right now. Really weird...
[Nexus 9 General] Gormsen:
Wakelocks mate, if you're having bad standby battery, then it's always wakelocks.

If you're rooted, then install Better Battery Stats, look what's cause your device to wake up from deep sleep, and then do something about it ;)

Smashed down on the mighty Nexus 9
[Nexus 9 General] asdf123101:
Gotcha. I'll check what's keeping waking the device.
[Nexus 9 General] FrankBullitt:
After a few days of usage, and after switching from Chrome (and disabling it) to Chrome Beta, I have the lightbleed issue, the uneven lightning issue, the volume buttons issue, but damn, the battery is nice now.

Right now : 1h2m SOT, over 1h of Google Play Music streaming over wifi during the morning and still 86% battery...

Yesterday I had already noticed a much better battery cicle, as I went well over the 4h SOT and was still above 40% when I went to bed and charged it.

Edit: screenshot

At this rate I have two days left of usage!
[Nexus 9 General] googlephone:
I have a HP touchpad running cm11and am looking to upgrade to nexus9 for better battery life. But after seeing all your battery life figures, the HP touchpad has almost the same battery life as the nexus 9 which will loss about 12-15% battery for 1 hour screen on usage.

I deceided not to upgrade to nexus 9 because no improvement in battery life.
[Nexus 9 General] FrankBullitt:
Really? You do know that it's a different league, right? I mean, you can't even compare both tablets and deciding not to move because of the battery lasting "only" ~8 hours of SOT is kind if weird...
[Nexus 9 General] googlephone:
Why do you say they are not in the same league?

They are both tablets capable of running android.

Yes nexus 9 has better screen, faster processor, 2 GB ram, lighter, and better camera.

But HP touchpad can run KitKat cm11 smoothly, will be able to run cm12 in the coming months, and can satisfy most of my needs for a tablet. And I value battery life the most important factor. So for me, I gain little for another $480 to buy the nexus 9. No improvement in battery life and much higher price lead me to deceide not to upgrade to nexus 9. I am looking for a tablet with 10+ hours sot battery life.
[Nexus 9 General] Pilz:
Moderate to heavy usage all day I had one random shut down as you can see, but pretty good battery life overall.
[Nexus 9 General] jd1639:
Anyone else not able to get any kernel wake looks in betterbatterystats? Seems that's not working for me.
[Nexus 9 General] nullzwo11:
Pilz, are you using stock?
[Nexus 9 General] Pilz:
No, I was running elemental kernel v004 for that battery life which has a CPU OC of 2.5GHZ. I just flashed v005 today and I'll see if it's better but both CPU and GPU are over clocked on mine. Also I am rooted but I have 0 root apps on my nexus I just did it for later when apps get optimized for the nexus. So to sum it up everything is stock except the kernel. I'm at 87% battery with 1.5 hours SOT currently do I may beat 8 hours today if that's consistent with the rest of my day. I'm using my nexus to type this too!
[Nexus 9 General] jd1639:
Battery isn't so bad. Give it a few charge cycles and it calms down. 100% stock, rooted
[Nexus 9 General] Ceiryus:
So I haven't had time to play with my tablet all day today, so it has just been sitting idle since I unplugged it in the morning around 8:30 am. So when I got around to check it around 9:30 pm today, it went from 99% to 50% :confused:

So in theory it should just be in deep sleep idle for for most of the day, but... looks like android system and exchange is draining my battery something fierce. Anyone else get this if you linked up your hotmail?

https://drive.google.com/file/d/0Bw07pRrfdFWIMGtqd2ZIa3Z0WGVKS21PaFpOdXdCTkV5em84/view?usp=sharing

(dont know how to submit pictures) :/
[Nexus 9 General] Pilz:
I have no such issues with mine but it could be you sync settings? I might hit 10 hours SOT today (I've been using it all day for school work and it won't die) I'm currently at 8h+ with 30% battery left.
[Nexus 9 General] Pilz:
11 hours SOT using battery saver when there Nexus wasn't being used I got 8 hours SOT without so it does work. That's what I call great battery life! :)
[Nexus 9 General] MetTrax:
Sorry to be a noob but what does SOT mean?

And is the new update helping with the battery?
[Nexus 9 General] jd1639:
Screen On Time. Too soon to tell if the new update is better
[Nexus 9 General] Pilz:
Was there a change log for it? I haven't flashed it yet, but I probably will later.
[Nexus 9 General] jd1639:
Haven't seen a change log so don't know what changed. If you're going to root it don't use cf-auto. I ended up in recovery and had to re-flash the image to get past it. Chainfires manual method works though.
[Nexus 9 General] Pilz:
OK thanks I used the manual method last time it was extremely easy to do.
[Nexus 9 General] mk92595:
I don't get more than 5hrs ost anymore
[Nexus 9 General] DoesntPostAThing:
On first day the battery drained super quick, and the device was hot all the time. Rebooted it that night and second day (today) battery was great. It's been 3 hours with a few reboots and root-related incidents in between and I'm still at 62%. I think it can last all day tomorrow as well. Auto brightness, all stock, rooted.
[Nexus 9 General] mk92595:
Its probably some apps that I have installed. Not sure which ones
[Nexus 9 General] mk92595:
Installed Greenify. Lets hope that helps
[Nexus 9 General] nealkoy:
Watching movies using MX player h/w decoder on this tablet is a champ! Only had 7% drain for a 3 hrs movie @ 60% adaptive brightness. Careful using the S/W decoder as it drains the battey and heats up the tablet like crazy.
[Nexus 9 General] Jeltel:
Hoe are you using MX player? It gives me an error saying I'm using an unsupported android version.
[Nexus 9 General] Dr. Hurt:
What video format?

Do you get HW or HW+ acceleration with HEVC x265 videos?

---------- Post added at 04:48 PM ---------- Previous post was at 04:47 PM ----------

Beta version here:

https://sites.google.com/site/mxvpen/translation/test-build
[Nexus 9 General] Jeltel:
Thanks.
[Nexus 9 General] nealkoy:
HW only HW+ still not supported in beta. File played was .mp4
[Nexus 9 General] oldswe:
In my case batterylife got notably better when I started to use Firefox Beta instead of Chrome. While using Chrome the device got warm near the camera on the back, that is not the case when using firefox beta.
[Nexus 9 General] nullzwo11:
Why exactly do you use the beta verison over the "normal" version of firefox? This is a serious question, although it doesn't sound like it :D
[Nexus 9 General] Dr. Hurt:
+1 for Firefox.

Fewer tab reloading too.
[Nexus 9 General] oldswe:
to be honest I´m nut sure :)

I think there is a feature the beta is capable of the official version is not, probably something Chromecast related.
[Nexus 9 General] nullzwo11:
Okay, because I was just reading about another guy who used Chrome Beta and reported less heat while browsing. Thought it might be something about the "betas" :D
[Nexus 9 General] brushrop03:
Ew my stand-by overnight was horrible. Seems something kept it awake all night though I'm not sure what it was. Was playing games and streaming video for over 2 hours before. LRX21Q
[Nexus 9 General] Pilz:
If you turn battery saver on over night it will lose less battery life. I got 11+hours SOT by turning battery saver on when I wasn't using my Nexus which you can see if you look a few pages back.
[Nexus 9 General] brushrop03:
Hmm I'll try that. I think I had a rogue app in the background too. You can see that it never went to sleep
[Nexus 9 General] Pilz:
Yeah I'm also running elemental kernel on mine which could help. I can drain the better in 5 hours of SOT but it's hard to kill it that fast even with location, Bluetooth, and auto brightness.
[Nexus 9 General] brushrop03:
Yeah, I haven't resorted to rooting just yet. Still want to test it out the default software first
[Nexus 9 General] Pilz:
I like custom kernel's, I'm rooted but I only have 1 root app so our doesn't really count.
[Nexus 9 General] Scotlac:
Hey guys,

I ran some numbers over the last couple of days so I wanted to post this here and hopefully get some feedback from people who are more educated on what normal temperatures should be on an Android tablet.

First off, the heat seems to be primarily associated with browser use and gaming. I have been using the CPU Temp app to monitor. I am unlocked, rooted and running LRX21Q.

Normal running temperatures for forum browsing using Tapatalk or AC App, YouTube and other miscellaneous apps seems to run somewhere between 90-105 degrees.

Chrome Beta, which seems to be the least problematic browser for me, runs in the 105-140 range. Dolphin runs 140-160 and Firefox (non-beta) was running in the 160-180 range. To put that in perspective, Dead Trigger 2 reached a maximum of 178 over a period of about 15 minutes of play.

I charged the tablet to full and ran it down to 90% twice. One time with browser use and one time without. The difference in battery life was dramatic. Almost 1.5 hours when no browsers were being utilized and only 40 minutes when they were being used.

What I'm trying to determine through this is whether or not this is the same issue that many people are experiencing and will likely be fixed with software tweaks or if I have some sort of hardware issue that would require the unit to be exchanged. I am otherwise very happy with my Nexus 9.
[Nexus 9 General] ÜBER™:
I think the problem with battery is how the CPU scales and how its used. Most I can manage is 6hrs screen time with moderate gaming and light browsing... Some YouTube. But yesterday and today I've been binge watching a TV show and managed this 9hr SOT. Soon as custom recovery is available, I'll be flashing a custom kernel to better handle the CPU. Seems to me how is scales is too aggressive.

I'm on the LRX21L build still... No ota and haven't side loaded either due to mismatch recovery issues and what not.
[Nexus 9 General] Pilz:
TWRP is already out for the Nexus 9.
[Nexus 9 General] Gormsen:
Really hope you're measuring in Fahrenheit ;)

Well, this is kind of interesting, don't exactly have the numbers, but I experienced way more heat when using Chrome than Firefox..

Message has been Baconized
[Nexus 9 General] Scotlac:
Lol, yup.... Fahrenheit.

I misspoke earlier. Chrome and Firefox were both betas in my examples above.
[Nexus 9 General] deepskydiver:
Thanks for this - it matches what I am experiencing, though I haven't checked the temperatures. Like you I want to know if this can be fixed in updates or whether I need to send it back.
[Nexus 9 General] deepskydiver:
Just to add to this, gently scrolling up and down this page in Chrome and the CPU temperature is between 135 and 145 Farenheit. Over 150 as I'm typing this.

That's ridiculous, right..?
[Nexus 9 General] USBhost:
That cant be right

Max i get is ~100f on chrome

And max ~140f playing games

room temperature is always about ~75-80f

And cpu is 2.5ghz
[Nexus 9 General] deepskydiver:
http://m.imgur.com/r9o37a4

This is browsing pages in this forum in Chrome.

I get about 2 minutes use for every percent of battery.