yashsingh1/xdaforums huggingface dataset:
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] sefrcoko:
Can you please post some screen shots of your battery life at the end of a typical cycle? It will help with comparisons by giving us more details on your running apps, screen-on display times, etc. Also, what wakelocks do you have? Use BetterBatteryStats or Wakelock Detector from the Play store for that. This info might help us to identify just how much drain is related to rogue apps or the general battery life itself.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] DownTFish:
Thanks. Just downloaded BetterBatteryStatus. I'll let it run for a bit and see what comes up. I'll post what I came up with with screen shots from it. Thanks for pointing me in a direction.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] roustabout:
Also, it'd help to know how many hours "just plain horrible" is.

I'm not delighted by the battery life I'm seeing, I'm finding I want to charge every night, and that I can easily consume 15% / hour or more even without the screen turned up past 20-25%. (watching video off the NAS in the house.)

Then again, this is the first LCD display I've been able to read in full sunlight, and that's remarkable to me. I often wind up with full sun in the morning when I get up, and am delighted that if I did charge overnight I can use the device even then.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] mingkee:
The battery needs some initial "training".

Charge fully on the first and run it all the way down to nearly zero, and fully charge again.

DO NOT interrupt the initial charge.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] Speedy Gonzalez:
Battery life is great here after 5 cycles running it to 1% and recharging full at first it was draining faster but now I can watch 4 hours of netflix and still have 25% left nice thing is that the battery charges superfast so no worries
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] redpoint73:
10% is just fine, for purposes of calibrating the battery meter. Preferable actually. You shouldn't actually drain the device until shutdown. There are safeguards that are

supposed

to ensure the battery voltage does not drop too low (its not actually zero when the phone shuts down). However, in

reality

these safeguards are not always failsafe and I've seen plenty of cases on various Android devices where letting the battery drain to shutoff renders the battery unable to take a charge (below the minimum threshold voltage). Sometimes, letting the battery charge overnight will bring the battery back. Otherwise, you are pretty screwed, as the only remedy would be a battery meter with a boost function.

In any case, the battery meter is not very accurate, even under the best of circumstances, so letting it drain to 10% is plenty accurate enough. Then let it charge to 100%, and let it sit at full for a while, as fully saturating the battery takes extra time.

---------- Post added at 11:15 AM ---------- Previous post was at 11:08 AM ----------

That said, its hard to say what "moderate use" means. Everyone uses their devices differently. If you are playing intensive games, downloading files, heavy internet usage, it can drain the battery much faster than other activities. And the number of hours of screen-on time is key. So the idea of getting some battery stats and screenshots, is a good one.

I haven't been tracking screen-on time myself. But I find the battery to be decent. I use it a good amount in the evening (don't bring it to work) mostly for reading and web browsing. I have brightness on 40-50% usually (sometimes less, if the room is darker). The battery was just under 40% after 2 nights of use (maybe 40 hours after the last charge). Just guessing, but maybe 3 or 4 hours of screen on time?

Some online reviews mentioned the battery life is not as good as some other comparable devices (such as Nexus 7 and iPad Mini). Not surprising, since the Note 8 has a faster processor and higher resolution screen than either. And so far, battery life is not amazing, but seems comparable or better (better drain while idle) than my old HTC Flyer tablet. So for me, thats just fine.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] sefrcoko:
I got about 4 hours screen-on time on my first battery cycle with heavy usage. Was playing games, movies, internet browsing, etc. My second and third cycles were better, giving me 5-6 hours screen-on time with moderate to heavy usage. Didn't really play any movies, but did play a fair amount of games and stuff.

On those later cycles my screen-on drain represented about 85% of my overall drain. This leads me to say that you can expect 4.5-6.5 hours of screen-on time with the Note 8, depending on usage. Keep in mind that I keep wifi always on, disabled bluetooth/auto-sync/smart stay, stopped some running apps like Maps and Factory Test, and kept brightness down to about 15% of the max setting.

Screen is definitely the big drain here, and these results lead me to believe that even with root and apps like Greenify I would not get much better results. Looks like any further battery savings will need to come from a custom kernel and custom rom (unless maybe you root and then underclock/undervolt using a third party app like Voltage Control or SetCpu). Anyone else have similar (or different :)) results?
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] Bagbug:
dumbest thing wrote in this thread probably. You do not need to train or do a full charge. How come people still believe that nonsense in 2013 ??
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] sefrcoko:
:what::eek:...XDA is for fun and for sharing; not for putting others down. Please be a little more respectful towards forum users when you post in the future. If you disagree with something then just explain so we can all learn together. :)
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] kisrita:
I am assuming the Note 8 has a lithium based battery. I couldn't confirm it though. The below link has some tips for how to care for different type of batteries. Useful reading.

http://www.techrepublic.com/blog/tablets/how-and-when-to-charge-your-tablet-battery/814
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] hertsjoatmon:
Although the battery life is of concern to me, the fact it charges via a micro USB input rather than propriatry cable alieviates that worry (looking at you Apple). I dont think I go anywhere where there isnt a charger available thanks to the amount of devices that use them.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] redpoint73:
While his terminology might have been a bit clumsy, he is not completely incorrect.

The terminology of "training the battery" invokes the concepts of conditioning the old technology NiCad batteries to prevent memory effects, which are not a concern with Li ion batteries, which is what you seem to be referring to. Folks on XDA will often talk about conditioning or calibrating the battery, which can be a bit misleading (as often they have the behavior of the old NiCad batteries in mind when saying this).

However, it is true that the battery

meter

needs to be calibrated to be completely accurate. This calibration has no chemical effect on the battery itself (like it does with NiCad batteries) but simply effects how the current readings are displayed by the % battery meter on the device's screen. Without fully charging and draining the device, it doesn't have fully accurate "flags" associated the current to battery %.

http://batteryuniversity.com/learn/article/battery_calibration

Failure to calibrate the meter won't have a negative chemical effect, like failure to periodically condition a NiCad battery. And therefore it won't have an affect on the battery life. But properly calibrating will give you the most accurate % battery reading possible. The battery meter is not accurate out of the box, after a ROM flash, and an OTA may also reset the calibration.

As I've already mentioned in a previous response, I don't recommend draining the battery to shutoff. As doing so can lead to the battery no longer taking a charge, and the device no longer powering on. Its rare, but it does happen. Fully changing, then draining to 10% or so is enough. Full cycles are also not good for the long term life of the battery, although just doing it once every few months is still acceptable.

---------- Post added at 10:21 AM ---------- Previous post was at 10:07 AM ----------

Pretty good link, thanks. And reinforces what I just said above.

Most any smartphone or tablet made in the past several years uses a Li ion battery. This confirms it: http://www.gsmarena.com/samsung_galaxy_note_8_0_n5100-5252.php

---------- Post added at 10:26 AM ---------- Previous post was at 10:21 AM ----------

The charger for the Note 8 is 2 Amps, while most MicroUSB chargers (at least for phones and other small devices) are 1 Amp. Although this varies, and there are other tablet chargers that are also 2 Amps; but these are far less common than phone charges that just about anyone with a phone that isn't Apple will have.

What this means is that the 1 Amp charger will charge the Note 8 very slowly. I tried mine on a 1 Amp charger just once so far. Left it on for maybe an hour, and the charge only increased by a few percent.

So yes, you can charge with most MicroUSB chargers in a pinch. But it will be slow.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] rEVOLVE:
Don't get the physical plug of a charger confuse you - I believe this tablet needs a 2amp output from the charger, meaning just because your charger has the same end connection, it won't necessarily help you charge this battery. I've had my users come to me thinking their devices are defective because they somehow started charging their tablet with their Bluetooth headset charger.

Someone also mentioned the black wallpaper that might help with the battery consumption - I believe that is only helpful on AMOLED screens that Samsung has used on other devices.

I'm really still on the fence on keeping it after I bought this - I'm coming from a GT 7.7 which had excellent build quality,screen, and battery life. The loss of the AMOLED screen for both graphics and battery efficiency is bothering me. I put both up side by side and feel disappointed that Samsung couldn't just make a JB updated 7.7 with new CPU, 2GB RAM, and stylus with the same design and beautiful Super AMOLED Plus screen. It's not even the price - but just feeling like I'm getting a somewhat inferior device (in a few but important aspects) from the 7.7, when it's supposed to be an upgrade to the older device.

I've seen the news about an upgrade to the 7.7 possibly coming, but will it come with the stylus that is also important to me and the other software enhancements from the Note 8?
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] mingkee:
Funny thing happened on mine.

The battery was VERY BAD the second day, but it could play live streaming for two hours when the battery was 1%. As soon as the tablet went off due to depleted battery, I charged it until it went all the way until the "full battery" came up.

After that, the battery is much better now, so don't say anything "dumb" or any nonsense because it works.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] redpoint73:
That is correct, having a black background does not effect battery life on LCD screens.

On AMOLED screens, black pixels are actually not emitting light (while pixels displaying other colors emit light), which is why a black background will cause less battery drain than other colors.

On an LCD, the liquid crystal layer that depicts the colors is not itself a source of light. Its lit from the back, and the light intensity of the backlight is the same regardless of what color is being displayed. How much light is blocked or let though by the liquid crystal layer varies depending on their alignment (what color is being displayed). But this doesn't affect how bright the backlight is, anymore than pulling a window blind makes the sun burn less hydrogen.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] ncguy68:
Only four hours? My Nexus 7 averages about 10.5 hours of Netflix with 10% left. I wonder how other note 8's compare?
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] FaeMinx:
I would be willing to bet some serious money that it will *not* have a Wacom digitizer, and thus will lack all the pen-centric features.

However, it should trump the Note 8.0 in almost every other area.

Samsung aren't going to make the Note 8.0 redundant untill they release the Note 8:0 v2.

The Note 8.0 is still the device I want. I *need* the Pen.

And guess what? I'm actually glad the Note 8.0 doesn't have a higher resolution... The higher the resolution, the more battery + processing power used, and the more noticeable the brush lag the larger your images get.

For the soc we have in the Note 8.0, the resolution is just fine. :)
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] Speedy Gonzalez:
it's getting better but not close to 10 hours lol any way is decent
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] yeah_mike:
Was really looking forward to this tablet. But numerous reviews so far (sorry, don't have posting privileges yet) consistently show that the battery life is worse than the Nexus 7, and much worse than the iPad Mini.

Now that root has been achieved, has anyone attempted using SetCPU or some other program to squeeze out a few extra hours of battery life?
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] redpoint73:
No shocker there. The Note 8 has a better CPU, and a larger & higher resolution (dpi) screen then either the iPad Mini or Nexus 7. So using more power is pretty logical.

Everyone uses their tablets differently. For me, I'm most often using it for reading, streaming some video, surfing, and downloading files. I leave it at home during the work day, so I use it for maybe a couple hours a night (sometimes more, sometimes less). With that usage, the Note 8 is lasting 2 to 3 days. So to me, it doesn't matter if I'm charging it every 2 days versus every 3 days or whatever.

But if you are playing a lot of games, or watching video heavily, and want to use it for several hours a day, the battery might not cut it. Or if you travel a lot on long flights, its obviously also good to have a nice long battery life.

But for my regular usage so far, its been just fine.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] yeah_mike:
You're right about the Note 8 having higher end specs. High demanding games should run much better on the Note 8 compared to other devices. But ideally, the CPU should down-clock itself when performing less intensive tasks in order to reduce battery use. For example, it certainly shouldn't take all 4 cores running at the full 1.6GHz just to play HD video. I feel this is where underclocking/undervolting the CPU may show benefit.

Now that root has been achieved, has anyone attempted using SetCPU or some other program to squeeze out a few extra hours of battery life?
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] redpoint73:
Of course it does. All smartphone/tablet CPUs will do this out of the box. The only reason it wouldn't, is if the governor was changed to "performance" or similar profile (which has the CPU running at full clock, all the time, which is never the case out of the box).

What you are talking about is further down-clocking below the "official" specs, which of course I agree this might yield better battery life, as well as trying a different governor. But I was talking about the "off the shelf" condition, which if referring to reviews comparing to other devices is what is most relevant.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] mingkee:
After a week of use, I found battery life is pretty favorable, but make sure you have to set "wifi on when charging" in advanced setting. This can turn wifi off when not charging which can save a good amount of battery.

When you use CPU intensive app, you notice battery runs faster.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] elmwood:
My first week, I was having trouble getting through my nine-hour workday without getting nervous about my remaining charge. I used it mostly to stream/play podcasts and maybe do some light web browsing while I code on my desktop.

For me, turning off Smart Stay, and lowering the brightness did wonders. I was on Auto Brightness, but it seemed to be a little aggressive in picking higher brightness levels then I felt like I needed. I keep it low, and adjust to be brighter as necessary.

My first-gen iPad still gets better battery life, but I don't feel like I have to charge it for an hour after I get home to be able to use it in the evening. That said, if it doesn't get a little charger time during the day, I may need to ration it a bit more than normal on the next day if I don't want it to run down.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] roustabout:
I'm noticing that the governor isn't doing a great job of managing hotplugging the cores. I posted this observation in the kernel thread, but I'm seeing situations where a single core is running at high load, the others are at 4-8%, yet all 4 are running at 1.6ghz much of the time within 10-15 minutes of boot.

They do back off later, but I haven't been able to get a good look at that yet.

I've done a little underclocking with setCPU and System Tuner, but of course I then immediately was curious about benchmarks. Antutu overrides the other apps' settings, and I haven't had a chance to look at use carefully yet.

I found a long discussion of the pegasusq governor at

http://xdaforums.com/showpost.php?p=24233103&postcount=3

My thought on the rumored tab 7.7 replacement is that we're actually using it, it's the note 8.

The rumor I saw called out four tabs - a low res dual core tab, an 8" amoled tab, and two 11 inchers, one for Samsung and one for Google.

I think the low res dual core is the tab 3 that was announced yesterday, the 8" device is the Note 8, and that there's been a lot of confusion around that.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] ncguy68:
The Nexus 7 and Note 8 have the same screen resolution. Hopefully one of the good devs will create a good custom kernel that will improve battery life. With stock the note 8 gets about 5 hours of screen on time... it sucks when you are used to getting close to 10 hours. :(
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] roustabout:
Try making a couple of changes to the governor - use smaller steps on the frequency scaling and tell the cpu to ignore processes that are "nice," (the nice flag basically tells the OS a process is low-priority.)

I am in early testing yet but the first change lets my CPU use a lot more gradations from idle to full throttle and the second change seems to let my cpu idle lower, longer as silly housekeeping processes don't flip on all 4 cores at 1.6 ghz.

Last night I used the device for about 5 hours, did a number of benchmarks and reboots, and went from 90% charge when I started to 45% charge when I stopped. If that holds up, that's a decent extension of battery without a noticeable (to me) performance hit.

The post I linked to above goes through the governor settings.

The two specific ones I left changed (via setCPU, but you can also change them with boot-time scripts, explained in the post above and writeable using the init.d mod I outline in the post on how to remount /scard and /external_sdcard) are

ignore_nice_load =1

freq_step was 37 is now 12
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] GalaxyBill:
It hasn't been good for me either. 10 days with this tab and here's what I did yesterday, with great results.

Took it down to 25 %

Disabled multi window

Charged over night

Turned on this morning, performed my usual routine and 14 hours later at 68%

Way better than the last few days...

Just my tweak that seems to be working for me.

Regards,
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] leginag:
Does multi-window use up a lot of battery even if you're just using one app?

It soundsl ike the major change you did was disabling multi-window...
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] tweak.:
Try downloading (if you're rooted) Greenify from the App Store.

I easily tripled my battery life on my phone by "hibernating" certain apps and I get 3 days out of my Note 8.0 now with pretty good use.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] GalaxyBill:
Not sure, I was trying different options to see how it affected bat life. This, so far seems to work for me.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] redpoint73:
That's true, missed that. But of course its still a larger screen on the Note 8, which likely uses more power, assuming other things being equal or similar (screen type, brightness and other specs).
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] bomariam1:
No problem, once charging in day and half, moderate usage.

تم الإرسال من جهازي GT-N5100 بواسطة تاباتوك 2
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] sakalu:
Charge fully on the first and run it all the way down to nearly zero, and fully charge again. DO NOT interrupt the initial charge.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] bbfoto:
IMO, you shouldn't really compare the N7 and N8 as far as battery life is concerned. The N7 JB ROM is what, 1GB? On the N8, with Touchwiz, the S-Pen, and the MANY features that Samsung has added makes this ROM ~6GB! That extra ROM is not static, there are MANY more processes running. Just the Smart Stay, Air View, S-pen/Digitizer, and Multi-Window features consume a considerable amount compared to an N7. It'll be great to see further results of using SetCPU and the like. So don't forget about all that extra stuff that the N7 (or iPad Mini) lacks when making a comparison.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] redpoint73:
Why not? It doesn't matter when the "full charge" flag gets placed when calibrating the battery meter, whether its the first charge or the 40th. As long as it gets a full charge at some point. In fact, it has to be done periodically for the meter to continue to be accurate long term.

http://batteryuniversity.com/learn/article/battery_calibration

In fact, your "initial charge" is not the initial charge at all. The battery always come charged to some degree out of the box. Presumably to prevent the voltage from dipping to low during shipment and on the shelf.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] GalaxyBill:
Well said bbfoto.

Just my 3 cents worth, but here what I found that worked for me:

Disabled PEEL Remote, muti-windows.

Disabled Spen on pull out.

Touchdown push disabled (I poll email when needed).

my batt is now almost where my G Note 10.0 is.

Regards,
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] bbfoto:
^Good info, thanks.

As a side note, for optimum Li-ion battery longevity (to not damage the internal chemical properties) the ideal charge level should not exceed ~80%. Samsung actually implements this charge-limiting feature as a switchable option in their CHRONOS 7 laptop line. The CHRONOS 7 batteries are not swapable, they are built-in just like the Macbook Air and Pro, etc. Is there an Android app that will monitor and shut off charging at a preset level? Is this even possible?

Considering the ROM size and all these extra features/processes, I'm surprised that the Note 8.0 runs as smooth and glitch-free as it does! It's quite impressive to me.
[Galaxy Note 8.0 (Tablet) Q&A, Help & Troubleshooti] janjannsen99:
That's what you're governor does it is called pegasusq and it shuts down cores and activates them on an as needed basis. Your tablet isn't using 4 cores all of the time. It only turns on all 4 when necessary