yashsingh1/xdaforums huggingface dataset:
[Nexus 9 General] serial_carpens:
I took these screenshots a couple nights ago after a lot of chrome use, some games, and video watching. 100% stock. The only thing I did that others might not have tried was disabling the Google Now hotword detection, auto backup, and location. If you're aiming for good battery life those are the 3 things you need to do with most android devices IMO.

EDIT: Forum won't let me post screenshots yet. But screen-on time is 4hr 13 minutes with 40% remaining, 15% chrome use, 7% youtube
[Nexus 9 General] JXulo:
hum, It's not that bad but still no more than 20% of chrome and you watching some vídeos which help a lot. I have this things disable too.

I trade for an iPad mini 2 two weeks ago and i can easily double the battery time. I don't even need to see battery stats. The difference is so big that some days i go to bed with almost 50%. I use less in weekend (for my parametres) and the battery survive two days and still do not reach 0%. With nexus 9 around dinner time is dead most of the times. Go to bed with some battery left was very very dificult most of the days, two days was simple impossible.

This is my first idevice and some things are annoying, i really prefer android but for my use i need a battery like this. Maybe with updates nexus 9 can reach closer...but for now this is what i'm looking in a tablet.

P.S-doesn''t get so hot as nexus 9 too.
[Nexus 9 General] geordie1976:
Battery Drain while on Charge.

I am having an issue with the battery that when playing Minecraft while my Nexus 9 is actually plugged in and charging, that the battery still drains!

I've never had this before on any other device where I still get drain while being on charge.

I'm unrooted stock, version 5.01 and am in the UK.

Any ideas?
[Nexus 9 General] R3Lax1:
Because games consume more power than the charger supplies to the battery, so it's bad to charge it while playing.
[Nexus 9 General] hOrnizuka:
Quick question:

I have a spare Samsung phone charger rated max at 2.0a. Is it safe to use this charger on my N9? I want a second charger to bring to school and if I could use it without spending extra money then that would be great! =)

Thanks!
[Nexus 9 General] madsquabbles:
it's happening a lot more on these more powerful tablets. it especially happens between 80%-100% where most are reduced to trickle charge.
[Nexus 9 General] USBhost:
Your fine

But your charging speed won't change

Unless your using a custom kernel

---------- Post added at 08:15 AM ---------- Previous post was at 08:13 AM ----------

I got 21% chrome

7 almost 8 SOT
[Nexus 9 General] JXulo:
Yes, we already know but you are not on stock and we already know that too so nothing new :).

Geordie1976. Don't do that or you will "destroy" your battery quickly. in no time you will have an old laptop that needs to be always Plug to electricity.
[Nexus 9 General] madsquabbles:
but if we're on xda why should we be on stock:p

i'm using USBhost's k5 kernel but stock rom and getting 8hrs OST mixed browsing, book reading and netflix watching (with speakers on). i last charged my tablet at 50% and had 4hr 13min OST and GSAM is estimating that under my usage for the last few days is 8:10 of screen time. but also keep in mind i've not ever gone over 0% screen since it's such a bright screen and i'm using it indoors.
[Nexus 9 General] JXulo:
Simple, because we pay too much, we shouldn't need the help of notable members like him to achieve that. If the price was lower I guess is a fair trade...but for almost 400 euros we should only buy it and use it without any more preocupations. (I don't even add other problems like the screen).

Imagine you came to my office and pay me well for lawyer work, I receive the money, tell one or two things that anybody else could tell you for half the price and then "if you want to win the case I know some 400 hundred pages books you can read and spent your time making a better case".

Or you just go to the office next door, pay almost the same and the guy just tell you "don't worry, just go home and i will take care of everything".

It's almost the same here, I pay 338 euros for a 16gb nexus 9(promotion) and in simple tasks like browsing I only achieve 5hours sot and almost never can use it all day long, just until dinner time. If I want to make it better I need to spend time and need the help of other people and risk "destroy" my nexus 9.

For almost the same money I can buy an iPad mini 2 and I don't have to worry anymore. Just use it normally like I did in nexus 9 and bang, 10 or more hours, I'm talking about my use (mostly browsing). I have lucky because I catched a promotion and bought an iPad mini 2 64gb for just 200 euros but even without the promotion it worth the money. After only one day of use I immediately returned the nexus 9, the battery difference is huge.

Usbhost prove that nexus9 can do better, but I will not wait to see if Google will make it better or not. They already have enough time to correct things.

Edit: i'm not saying iOS or iPad are perfect. 0% is way too low for me, I used it between 20-30% and it was to save battery because for my eyes 40-50% was what I like.
[Nexus 9 General] USBhost:
You made your case very well

If and only if Google would just fix this one file

they would fix the battery problem on full stock
[Nexus 9 General] madsquabbles:
I've actually bought a few overpriced based on potential of the work the guys here put into it. It sucks for the average consumer to get a half assed tablet.
[Nexus 9 General] chrisnewton:
Spot on.. And that's why I'm sticking with my Nexus 7, because I mainly use my tablet for browsing.
[Nexus 9 General] AstroDigital:
To me it is the best tablet I owned, I had dozens.

THEY ALL COST ME ABOUT THE SAME $500.00

What do you whiners think it should be free, how is it over priced?

Battery life I go two days between charges, moderate use. I am sorry my life is too busy to spend 5 hours a day browsing on a tablet (This is heavy use).

No light bleed, at all... but my Galaxy Note 10.1 had light bleed.

Storage got me an OTG Memory stick and it works great.

The size is perfect and natural for reading (my top use)

Hate the Nexus 9, sell it and move on.

FYI I own an iPad overpriced junk tied to Apple ecosystem and I was glad to get rid of it.
[Nexus 9 General] JXulo:
If you read without google glasses you may had realized that I don't need to sell it, I already returned it and moved on for a better tablet (for my use of course).

And I don't hate nexus 9, sound was awesome for example and I prefer android over iOS. I still have hope that Google correct this things and put nexus 9 in the place it deserves.

If my opinion are bothering you I invite you to ingnore it and move on because your time is short like you said and you don't need to waste it in whiners like me.
[Nexus 9 General] R3Lax1:
Could you please explain what is wrong in it?
[Nexus 9 General] USBhost:
sysfs_write("/sys/devices/system/cpu/cpufreq/interactive/hispeed_freq","1530000");

That right there

Needs to be 1ghz not 1.5ghz
[Nexus 9 General] R3Lax1:
Ah, yes, I have it set to 1020mhz
[Nexus 9 General] Migamix:
sad thing is, it does function perfectly throttled down from its top performance setting, but manufacturers want to have impressive benchmarks for those antpoopoo benchmarking apps and speed fiends, and top it off at the expense of battery life. when they report expected battery life in sales papers, they must throttle back down and take a different reading.

I have found just slowing a particular setting down oh so slightly, I'm getting more realistic battery life for the size battery in it, with absolutely no noticeable function loss.

it just look at the annoying amount of people posting their benchmark scores with pictures (where the ASCII text numbers will do) and you will see the obsession with speed vs life I'm referring too. (the speed demons still ***** about battery life). this setting change I did is giving me much better idle battery too. I unplugged my tablet 3 hours ago, and it still read 100 (realistically may have been 99.3 since after a couple of min, it went to 99)

we are NOT trying to shoot a missile in a 2 meter hole, we don't need to go in full throttle!

on a grumpy note, I will say some of lollipops faults are from AOSP trying to emulate iOS. we don't need so many slow animations that waste time and system resources.. if the battery saver option didn't put a nasty orange on my menu, I'd be running it more often.
[Nexus 9 General] :
Do I win?
[Nexus 9 General] borchgrevink:
Easy to do?
[Nexus 9 General] USBhost:
Nop not easy

You will have to end up compiling the ROM
[Nexus 9 General] R3Lax1:
Or you can just change the parameter via a kernel tuner.
[Nexus 9 General] USBhost:
I know that lol
[Nexus 9 General] R3Lax1:
Obviously, but the guy who asked you doesn't :).
[Nexus 9 General] borchgrevink:
So, not possible to make a zip file you can run when rooted?
[Nexus 9 General] ram130:
Agreed. I've already done that. I now have an N7 and iPad mini 2. I'm much happier. Especially when I don't need to worry about tweaking or removing apps.p for battery life. Frankly. After two weeks my iPad battery got even better. I still long for a better N9 though. One day.
[Nexus 9 General] farmerbb:
Wow, changing this to 1020000 via the kernel parameter is giving me about two more hours of SoT, and significantly reducing the amount of heat as well... thanks for this!
[Nexus 9 General] :
Whatever u guys are talking about u should tell google so they put it in the next update

Sent from my Galaxy Note 4

https://www.skypixel.com/user/eric-long

http://www.youtube.com/mustang2005
[Nexus 9 General] USBhost:
See google needs to fix that
[Nexus 9 General] mhannigan:
Perfectly safe. The charge current is limited at the device. Power is "drawn by" a device and not "pushed to" a device. So the Nexus will only take what it wants.

Mike

---------- Post added at 04:02 PM ---------- Previous post was at 03:52 PM ----------

What if that "same price but go home" lawyer told you to go home and he'll take care of it, but when you call him to find the status, you go straight to voicemail, when you visit his office, the door is always locked, and you can't even see inside, much less find out your status because when he told you not to worry about it, he meant it. You would love to just believe it is taken care of, but a year later you see on TV that he's moved on and he's representing Amanda Knox in Italy appealing her murder conviction... you are nothing to him now and you can't even access your own case files... like Apple.

Mike
[Nexus 9 General] JXulo:
I don't understand your analogy, can you explain it better? Are you saying that Apple doesn't give support to their customers?
[Nexus 9 General] madsquabbles:
i get what JXulo is saying, he's got every right - as do we all - to expect to see this 9.5hrs of browsing time google claims for a tablet that costs $399USD. even at 0% brightness on stock there's no way to achieve this. something got screwed up since the initial reviews and the final shipping edition.

one thing that does puzzle me is why come here, a development community, and whine about how you have to tweak and mod something to get it working the way you want? that's exactly what this community is built on, people who look forward to modding their toys. be grateful that there are guys here that are willing to take our toys and mod the hell out of them for us, risking a loss of a tablet if anything goes wrong.

i agree 100% that google and htc are hurting themselves with these serious bugs. but it's like i said before, i love this forum because i can make a purchase based on specs and potential and know that someone here is gonna max this thing out for us and unlock every bit of power and battery life it has. i can understand that you're not willing to do so, but you really can't expect guys who love modding to totally agree with you.

also, i won't recommend this tablet to anyone that's gonna run bone stock 'til it drops $100USD and google fixes the browsing drain.
[Nexus 9 General] :
My n9 lasts about as long as my note 4 i have no complaints

Sent from my Galaxy Note 4

https://www.skypixel.com/user/eric-long

http://www.youtube.com/mustang2005
[Nexus 9 General] rumactifin:
Well, it looks nice. :)
[Nexus 9 General] Faxx4840:
Hi guys.

I takes 4 hours to reach 100% from 50%. Think its very long. Someone notice this ?

Envoyé de mon Nexus 5 en utilisant Tapatalk
[Nexus 9 General] madsquabbles:
occasionally my tablet acts up and won't charge at the full speed. replugging usually fixes it.
[Nexus 9 General] jason-tech-uk:
I've tried a few different things to try and prolong the life of the battery but find that it doesn't do too well when I'm using it for videos. Normally find that after one or two movies it needs charging. Had an iPad before which had a great battery life so this one is not as good.

Any tips of how you've managed to get more juice out of it?
[Nexus 9 General] nklenchik:
It's a known issue. You can flash a new kernel that allows for 2amp charging instead of 1.5, stock kernel. I flashed elemental x on the stock rom yesterday and it's charging very quickly (as compared to before).
[Nexus 9 General] ahhahh:
This is just amazing. I'm on stock 5.0.1, only rooted, installed adaway, and changed this parameter through trikster mod. My nexus 9 is now 17% battery left, with 6 hours 50 minutes SOT, 100% chrome use, and 5 days since last charge.

And no performance lost at all. Thanks a lot for this tip, I'm now pretty satisfied with my tablet...
[Nexus 9 General] Metallice:
The N9 is an interesting device when it comes to battery life.

I have to say the power efficiency of this display is astounding. I can easily get over 10 hours SOT easy if I'm using it for reading PDFs, papers, books, or comics. Considering how bright this display gets I really am blown away. Andandtech gave it a lot of praise over the Air 2's panel in this regard.

Unfortunately as soon as you start touching the screen or stressing the CPU in any way the battery life plummets. I don't even think the GPU is that battery taxing. Possibly because it's hard to stress it. I get pretty good battery with KOTOR, San Andreas, or Wolf Among Us all maxed out. Even though KOTOR stutters some at max my battery life is still fine. Although my tablet doesn't ever get hot like others. That could be a factor. Both sand models (Dec models) I had were pretty great in this regard compared to the 4 whites I returned (3 Oct/1 Nov)

It seems to me the CPU is the big hog here. NVidia did some interesting stuff for performance with all the code morphing and in order execution, but not much in the way of battery life. No ARM big.LITTLE or nvidia companion cores anymore.

The stupidly "loose" interactive governor doesn't seem to help either. This might just be default for lollipop or they (probably Nvidia rather than HTC or Google, the 2012 N7 used Nvidia's own interactive gov for tegra 3 from their kernel source) are purposefully trying to avoid some of those occasional pauses or hiccups when cold starting some apps from home screen or through the recent apps screen. Not sure haven't really looked into it.

Unfortunately due to how well the K1 performs everywhere else this looks to be a problem with K1s unique design and can't be truly fixed by favoring high frequencies. (See Andandtech's review)

Seems to me tweaking interactive or using a modified version of another governor is the way to go.

(Sorry for the short essay!)
[Nexus 9 General] Diaphragma:
Came home from work and found my nexus 9 at 98% battery left.

Standby battery life is pretty impressive! Only 2% used in 10 hours!

I have set "Keep Wi-Fi on during sleep" to only when plugged in.
[Nexus 9 General] madsquabbles:
I've also notice that the screen touch seems to be the battery killer. Using cpuz you can put your finger on the screen and see the cpu go to nearly full speed at 20% utilization. I've been using fire ice kernel and applying the govfix script and now it only goes to ~500Mhz when interacting with the screen. I haven't done a full drain test but gsam says that going by my average usage I can get 8.5 hrs screen time.
[Nexus 9 General] rolling_thunder:
I got my nexus 9 on saturday the 14th, so four days with it so far. Im getting 5- 5 1/2 hours of browsing with chrome. Its stock btw. Not really all that psyched about that, maybe 5.1 will help
[Nexus 9 General] madsquabbles:
Right now the way nly solution I've found is to install a custom kernel, then you can edit the gov settings to keep it from ramping so damn high every time you touch the screen. Under clocking the GPU helps too. I'm getting about 8hr screen time. I almost never over 0% on the screen since its so bright.
[Nexus 9 General] USBhost:
Not bad for a day of reboots flashing kernels and etc...
[Nexus 9 General] willows:
Can you give me the detail about edit the gov setting?

Thanks
[Nexus 9 General] madsquabbles:
I'm using usbhosts fire ice kernel. He's got a gov fix script included but I couldn't get it to run reliably after reboots. SetCPU can work also, but I use elemental x kernel app so I can tweak the gpou too.

The only change I made was to set lowest freq to 204, the in gov options change the hispeed_freq to anything less than the default. I have mine at 714, just 200 more than usbhost govfix script. The gpu is set to half the default.

I don't play games on the rablet, but I now get tons better battery when surfing and reading... Tons is exaggerating, but it is better?
[Nexus 9 General] polish_pat:
I concur. When browsing the web, reading emails, ebooks and other light stuff, I get good battery life, can go to 2-3 days with moderate use. Today, i streamed 2 periods of a hockey game on the nhl app on wifi, also with no sound because i had music playing in the house. I unplugged from full charge at 6, the game started at 7:30 and by the end of the second period I was down to 50%. That means that in less than 3 hours, streaming a game took half of my juice. My Note 4 does a much better job and pushes a smaller screen but about as many pixels as this screen. I watched an entire hockey game on LTE a day when i came back from work and had no electricity, when I got home, i had about 60% left, at the end of the game, i had a bit less than 25% left. This tablet's battery life is really all over the place. Now that I saw your post, I can stop worrying that I got a defective unit because I was literally worried my brand new Nexus 9 LTE had something seriously wrong with it.

I really hope Google, HTC, and Nvidia work out the battery issues because this is one of the worst battery problems i've ever encountered with any device i've owned. I just can't believe I can kill the battery so fast just by streaming.

Also, the battery stats say facebook is my biggest battery sucker and NHL is only 1%. I have a lot of trouble believing that
[Nexus 9 General] m2thedeep:
Is there a kernel tuner that's recommended for the Nexus 9?
[Nexus 9 General] Dark Jedi:
I feel battery life is pretty good for the device. I think by now with as many devices that's been released over the years take the battery life stats given by the manufacturers. Their stats never matches up to ours. Here's what I got on a full charge. Think good screen on time.
[Nexus 9 General] GibsonSGJ:
Hey, I see that you are not using Chrome. That seems to be the main battery hog for me. What "Browser" are you using and about home much of your time was spent using the browers? I love this tablet BTW. The video watching time you get with this thing through MX Player is amazing.
[Nexus 9 General] Dark Jedi:
I am using the browser that came with slim lp 5.0.2. I use Facebook quite a lot Which is known to drain a battery quite good. I was mostly getting to the point of with all the devices that has been released over the years has proven you will never get what the company says they got when testing. For all we know they could have a very stripped down version of lolli or even a special in house version of chrome. Everyone uses their devices differently. I will test chrome and chrome beta and see how it goes but I play that trivia game and other things That can be looked at as battery hog. I do disable GPS and WiFi turned off when screen is off. I just feel that this device is decent on battery life. I just think people can have high expectations when it comes to a new device. That can never be satisfied.

My HTC one on the other hand can drain fast no matter what I do with it lol
[Nexus 9 General] jd1639:
Note the averages over a three month time frame. The battery can be good on this device. Used mostly for browsing, some you tube and social apps.
[Nexus 9 General] quimpudim:
Hi guys, I have a question

I just love to play world of tanks blitz, for hours and hours and was wondering if it´s ok to use the N9 with de battery fully charged and plugged. Just like on a PC exetp that we can´t remove the battery.

Or maybe is not good idea?

Sorry for my english

Cheers
[Nexus 9 General] joao44289:
I can barely get 5 hours of screen time . How the hell do you manage to have 7+?

I have stock ROM and kernel and non-rooted perhaps some of you that 7+ hours of screen time have a different ROM ?
[Nexus 9 General] Hiro Nakamura:
It is the best to avoid playing and charging at the same time because charging causes extra heat to the battery and playing games heats the device up too.
[Nexus 9 General] octagonPerfectionist:
I feel like the battery life is significantly better when doing things like reading pages of text and not doing a whole bunch of things in quick succession. The CPU seems to be extremely inefficient when starting new tasks and performing operations which are non-recurring. For those who don't know, the CPU runs all instructions given to it through a software code optimizer and looks for recurring code to use in the relatively numerous native execution units.

Now I'm not an expert by any means but it pretty much seems as though only very specific tasks use the CPU efficiently, and everything else pretty much drains the battery very quickly. Reading long Wikipedia articles results in extremely good battery life, but browsing the web and rendering many new pages kills the battery, far moreso than it seems it would on a device with any other chipset.
[Nexus 9 General] aoleg:
I think it's even simpler than that. Every time one touches the screen, the CPU goes full power. This, in theory, should provide the smoothest usage experience with the least lag. In practice, it causes severe battery drain. Interestingly, some synthetic tests trying to emulate casual Web broswing demonstrate a much, much longer battery life compared to myself doing the same.
[Nexus 9 General] Ace42:
Touch boost tends to be overkill, if not always. On my Nexus 4 & G2 I disabled any boosting because it not only kills battery, it also makes the device too warm, which makes it uncomfortable to hold. Also you will want to pay close attention to the parameters of the CPU gov you're using, chances are that it's biased towards remaining at the highest clocks. When I get a Nexus 9 I'll compare the perf/battery when using a conservative setup.
[Nexus 9 General] Dr. Hurt:
I've seen lots of commits capping CPU and GPU frequencies in 5.1 flounder AOSP. Hopefully this will have a positive impact on battery life after the update.

Can't wait!!!
[Nexus 9 General] borchgrevink:
Great news. Source?
[Nexus 9 General] Dr. Hurt:
The device tree commits over at AOSP.
[Nexus 9 General] USBhost:
I have to say a new best for me

11h
[Nexus 9 General] seanashmore:
wow, is that with 5.1 AOSP? Or have you been messing with other stuff?
[Nexus 9 General] izan007:
Uffff, unbelievable for my nexus
[Nexus 9 General] USBhost:
5.0.2 AICP SaberMod version

FIRE-ICE K8

Its very believable
[Nexus 9 General] seanashmore:
I put that setup onto my tablet but it wouldn't detect the Google Now Launcher so I went back to stock but with Fire and Ice K8. I guess the kernel will do more for battery life than the rom anyway.
[Nexus 9 General] matejilic:
I get 5 hours of SOT over a day and a half, but this is my first charge cycle and am hoping for better. With the Nexus 10 I got about 8 hours.. Browsing just destroys this tablet.