yashsingh1/xdaforums huggingface dataset:
[Galaxy Note 8.0 (Tablet) General] gooberdude:
You probably will get a better response posing in the Q&A section.

this has been covered so many times. Just search for my post on charging and battery or just click on my id and select posts, you should see a number of ways to resolve.

DVFS disabler will correct your battery stats after a shut down and restart, or try another cable. Samsung's charging cables are weak and fail, been through 2 already, and now use Sony Ericson cables.
[Galaxy Note 8.0 (Tablet) General] PauloRMag:
the purpose was to show my results :)

New results
[Galaxy Note 8.0 (Tablet) General] gooberdude:
Sorry... I did not realize i quoted the wrong guy... I was quoting the reply after yours... that is what I get for speeding through and leaving.

Well maybe they figured out their issue by now.
[Galaxy Note 8.0 (Tablet) General] RavenAlias:
thanks :)

I'll try!

Inviato dal mio GT-N5100 utilizzando Tapatalk
[Galaxy Note 8.0 (Tablet) General] bob60626:
I just disconnected my battery. I turned the tablet off at 17% but accidentally turned it on while taking the cover off- it was at 32 then! I figure thirty minutes disconnected should be more than enough.

---------- Post added at 10:32 AM ---------- Previous post was at 10:19 AM ----------

Damnit, I can't get the battery connector completely back in. One side won't snap in. Any ideas?

---------- Post added at 10:37 AM ---------- Previous post was at 10:32 AM ----------

It turns back on (@ 39%), should I be worried?
[Galaxy Note 8.0 (Tablet) General] bob60626:
Hooray!!

Standby time has always been excellent.
[Galaxy Note 8.0 (Tablet) General] bob60626:
I ended up with 7.5 hours of screen time with 9% left, 4g on the whole time and wifi the last hour or so.
[Galaxy Note 8.0 (Tablet) General] bob60626:
A few days later, battery life is still great. I really want to get a 5100 now!
[Galaxy Note 8.0 (Tablet) General] doncerdo:
so I had the same battery drain issues that many people have encountered.so the first thing I tried to see what was going on. now I feel the when the brightness bar is not set to automatic it drains the battery faster than anything that I could do with automatic.after countless times of trying to calibrate the battery I eventually found this thread I actually performed the battery disconnection. before I did the battery disconnection I had about 10% left but when I put back the battery which was a couple of minutes after that, I had 30% battery left.so after this I left a video running with brightness in manual and Full Tilt and let the battery discharge completely. then I tried turning the device on again and the battery was completely dead. So after this I let it charge completely to 100%. It took longer than before and when I turned back the device to use it unplugged with brightness set to manual at full tilt the battery is discharging at a good pace but still fast. I switched the brightness level to auto now and the battery actually behaves at very acceptable rate much better than what I had before and I'm completely happy with how this issue was solved.thank you so very much guys for all your help this is definitely the fix for this tablet it's unfortunate that probably we will have to be opening our tablets a lot of time but at least it works.one little bit of information is that the battery problems started happening when I started using an alternate charger one charger that has 3 USB out and that's when the charging issue started happening so maybe charger help some. Anyways guys once again thanks for everything and I'll be reporting back if I still have any problems after, peace!
[Galaxy Note 8.0 (Tablet) General] Big4570:
I've been having a similar problem as the rest in this thread. I was previously only getting about 3.5 hours of on screen time. I installed battery doctor and now I'm at about 5.5-6 hours of on screen time. I have the brightness on auto at the middle setting and power saving mode turned off. As I did not want to hinder the tablets performance.

Is this acceptable?
[Galaxy Note 8.0 (Tablet) General] cybershawngates:
short of manual battery disconnect has anyone tried ODIN rewriting the entire firmware? You'd think that might work?
[Galaxy Note 8.0 (Tablet) General] dhd1802:
I tried that with a note 8 and a tab 3. Didn't work for me
[Galaxy Note 8.0 (Tablet) General] cybershawngates:
Noticing Netflix has a HUGE drain with our device. Is there any kind of HW/SW acceleration or some setting that might cause this?
[Galaxy Note 8.0 (Tablet) General] User_99:
Deleting the bin file do nothing in case of battery life...
[Galaxy Note 8.0 (Tablet) General] cybershawngates:
<<DELETED>>
[Galaxy Note 8.0 (Tablet) General] cybershawngates:
[MENTION=1873899]User_99[/MENTION] is right - seems rooting and CM11 and deleting batterystats.bin has done absolutely nothing. Symptoms - fully charged then when watching netflix slowly gets to about 35% --> then abruptly to 14% in a few minutes and immediately to 4% and off (all this in 5 minutes while watching netflix.)

So desperate measures call for desperate times, I've opened up the back (used actually a precision flatblade screwdriver and did ok, just be very careful and pry small amount and keep moving along and it will gradually pop right off. So the battery is disconnected 20 minutes. I guess I'll wait the full hour. I use a 3rd party magnetic cover.

UPDATE: 1 hr later I have reconnected battery - it has jumped from 1% to 41% that is really strange but consistent with what others have posted here. I will charge it now and observe.
[Galaxy Note 8.0 (Tablet) General] cybershawngates:
Battery life shows the sudden drop I was used to experience and then also the fix after reconnecting the battery.

Anyone know how long this fix will last?
[Galaxy Note 8.0 (Tablet) General] bob60626:
Mine has worked fine since I did this, a few months ago I think. I noticed a slightly faster drain when I unrooted to try to install the 4.4 update, but I'm not super sure on that. Imo, the manual reset is good to go.
[Galaxy Note 8.0 (Tablet) General] cybershawngates:
yep mines been great since the disconnect. I'm actually gonna switch from CM to Stock (I feel like the screen brightness isn't as great as stock). See if the great battery life continues. UPDATE: Drain came back with stock.
[Galaxy Note 8.0 (Tablet) General] server5:
Haven't others already mentioned that the disconnect was a temporary placebo effect?

This sounds purely more and more like a software issue as the disconnect resets voltage parameters.

I do know one thing, after updating to the latest stock rom battery life stabilized greatly but still could use tweaking. I might just give the disconnect a shot just to be sure.
[Galaxy Note 8.0 (Tablet) General] rtiangha:
The trick is that for the fix to stick, you also need to disable Dynamic Voltage Frequency Switching (DVFS) otherwise, it'll come back over time. That means running a 3rd party ROM or a stock ROM with Xposed and one of the modules that disables DVFS. The battery pull just forces the fuel chip to reset itself once it becomes borked.
[Galaxy Note 8.0 (Tablet) General] rogerperk:
Shelled out the bucks for a new battery and it hums right along now. Just sayin'. A lot easier than tinkering with the guts.
[Galaxy Note 8.0 (Tablet) General] Athinared:
Just a newbie question, how long should our battery last? Let's say with the everyday use of wifi, no games just browsing every now and then. Thanks:)
[Galaxy Note 8.0 (Tablet) General] misternagoya:
Did you get an OEM battery?
[Galaxy Note 8.0 (Tablet) General] cybershawngates:
Will cyanogenmod automatically disable this
[Galaxy Note 8.0 (Tablet) General] Dan330:
I am so glad to find this post... :)

just got my used NOTE8 last week from craigslist. AT&T LTE version SGH-I467 (so many different model numbers)

battery is Terrible!!! lucky to push 1.5 hrs out.

last night I tried to take the back off with a plastic credit card.. only got one side off.. I gave up.

need to go find something at home depot this weekend to use.

but I did try to drain the battery.. after a little more than 1 hr.

It was at 1 %.. it only lasted about 15 mins there. :crying:

and died. rebooted to 0% many times.. and it would shutoff 1 min later.

left it off over night..

got to work and plugged it in (still off).

it took the battery indicator about an hour to reach about 10% (estimate).

30 mins later.. it was at 100%!!!! CRAP!!!! :confused::crying:

turned it on.. it was at 88%.

turned it off.. and plugged it in to charge.. it showed about 85% charged.

I think I need to find a way to open this thing up!!! :mad:
[Galaxy Note 8.0 (Tablet) General] rtiangha:
Yeah, it gets a little tricky near the buttons. You just have to gently keep at it.

Hitting a music store to get some cheap guitar picks would work too. The stuff that ifixit used to sell in the beginning before they started manufacturing their own stuff were essentially glorified guitar picks to be used to pry stuff open.
[Galaxy Note 8.0 (Tablet) General] PO47:
disconnecting the battery works.

After update to 4.4.2 I had the same problem of quick battery drain + device overheating error.

first I downgraded my note 8 to jelly bean which solved the "overheating issue"

(Even though charging the battery is tricky when the tab is off. But still better than overhanging issue and force close)

Then I removed my battery like others (at 40 percent) then after an hour reconnected it. After that it had 89 percent left to my Surprise!

It's now working fine like before. No drain issue or sudden jump off Battery percentage when charging.
[Galaxy Note 8.0 (Tablet) General] Dan330:
I was at Walmart getting stuff...and a saw a plastic putty spreading tool in the paint section.. for $.70.

It worked!

Disconnected at 70%..

Waited 1.5 hrs

Booted up at 70%

Took 3 hrs to charge to 100%

Now battery life is awesome.

Thanks everyone
[Galaxy Note 8.0 (Tablet) General] server5:
Still think this is a placebo effect.
[Galaxy Note 8.0 (Tablet) General] rtiangha:
Just make sure to disable DVFS using one of the xposed modules after doing the battery pull, else you'll be doing it again eventually.
[Galaxy Note 8.0 (Tablet) General] Dan330:
Well.. I am a very hesitant to believe many things. Too..

But I got this note8 used on Craigslist last week.

Since I got it .. it has not been able to get past 1.5 hrs screen time. Sleeping, it drops 5% an hr. Driving me nutz.

Tried to fix it ..with many suggestions

Nothing helped [emoji35]

Right after this battery unplug.

It is 16 hrs since last recharge. .

2.5 hrs on screen..

With 51% battery left

It is only dropping less than 1% per hr while sleeping

That is very concrete evidence to me .

I 100% validate this fix

Can you explain more ..and point to the instructions?

Thanks a bunch
[Galaxy Note 8.0 (Tablet) General] rtiangha:
What you need to do is root your device and install the Xposed platform (Google for it; lots of instructions out there on how to root the Note 8 as well as to install Xposed in general). Then install either the Samsung DVFS Disabler module, or the Wanam Xposed module. Both have options to disable DVFS (it's the Dynamic Voltage Frequency Switching over time that confuses the battery fuel chip into thinking it has 40-50%+ less capacity than it actually has and once the fuel chip becomes miscalibrated, the only way to fix it is to force it to reset itself and the only way to do that right now is to cut power to the chip (theoretically, there should be a way to do it in software and someone here found the data sheet for the chip, but the instructions didn't work; either the data sheet was wrong, it was the wrong sheet (i.e. the Note 8 is not using the fuel chip we thought it was), or we weren't doing it right). A battery pull will do it, but also running down the battery to 0%-ish will do it. Problem is, the reason why it dies so fast is that the chip thinks it's at 0% when really, there's 40% or more of charge left (this is why it only lasts for 1.5-3 hours once you have the problem, rather than the 7-10+ hours it should last), so the only way to run it down is by leaving the device on in recovery mode until it turns itself off (which could take hours), but that's risky since if the voltage gets too low, you may not be able to charge it up again (that's why devices have auto-power off when the battery is almost empty; to prevent it from running down too much to the point where you can no longer charge it up again) so a battery pull is safer but more inconvenient). Once you reset the fuel chip, everything is fine again, but if DVFS is left on, the problem will return eventually.

Using the Wanam module to disable DVFS is better than the standalone module, because there are some other fixes included in it (but like the DVFS Disabler, you have to activate them). You can activate the SDcard permission fix which makes writing to the external SD card behave like it used to pre-KitKat, as well as the SystemServer Crash fix (if you've ever noticed your Samsung KitKat ROM randomly reboots for no reason, this option may help). You can find all of these options under the Advanced menu of the Wanam Xposed module. Or there are separate Xposed modules that can do those too. The choice is yours.

Edit: However, be aware that you'll trigger the Knox flag if you root the device so if you're still under warranty and care about that, or if you actually use the Knox container for work stuff or whatnot, then you may need to consider how you want to proceed. Mine is out of warranty and I don't use Knox, so rooting wasn't an issue for me.
[Galaxy Note 8.0 (Tablet) General] Dan330:
Thanks for the detailed explanation. . I see

No warranty on this used tablet. . Knox is non issue

But does 4.4.2 have any root protection?

Does it prevent unlocking from att?

I like to root my devices .. so that I can still get android updates past manufacturer updates.

This forum seems very slow..

How is the development support?
[Galaxy Note 8.0 (Tablet) General] rtiangha:
It shouldn't. I think you can still use CF Auto Root to root the KitKat ROM, or flash a custom recovery through Odin and then flash Super SU that way. But I have the WiFi version so not sure how it works on an AT&T device. Also, not sure how Sim unlocking works if that's what you mean by unlocking. But I'm sure you're not the only person who's faced this situation on these forums. Maybe try a search first?
[Galaxy Note 8.0 (Tablet) General] kesara:
This is the best to take the back off

Newer Technology iSesamo: Ultra-thin steel pry tool for opening iPods, iPhones, iPads and more. https://www.amazon.com/dp/B00792JJK4/ref=cm_sw_r_awd_73WUub1NTKRMV
[Galaxy Note 8.0 (Tablet) General] Dan330:
yeah.. I was just a Radio Shack to see if they had any tools.

The tech was working on a tablet and showed me the tool Radio Shack had for him.

and it was that tool: iSesamo. I played with it. it was very thin.. strong.. bend a little but no twist.

They don't have this tool for sale!!!!

$6 + shipping ... just the tool

or http://www.amazon.com/gp/product/B00PHNMEMC/ref=pd_luc_t_ttl_rh_sbs_02_01_lh?ie=UTF8&psc=1

$8 free shipping.. 8 pieces and it includes that tool.
[Galaxy Note 8.0 (Tablet) General] Dan330:
ok... to save even more battery life. Get "Deep Sleep battery saver"

I have a smartphone connected 100% of the time to get all my notifications.

I only use my Note8 for reading and play. There is no reason it needs to be getting notifications of emails, texts, news, social media.. unless I wake it up to use.

after I did the battery disconnect tip. it went from 1.5hrs WAKE time to more than 5 hrs.

i created a thread for this here: http://xdaforums.com/galaxy-note-8-0/general/deep-sleep-battery-saver-to-save-battery-t3015530

but.. even when sleeping.. it would drain about 1-2% battery per hr sleeping.

android and system processes! and media updates.

so I found this app called: "Deep Sleep battery saver".

when the screen is off.. it turns everything off.. all connections.

allows NO updates.

you can set it up .. to wake up for 1 minute every hr.. or 2 hrs.. or 4 hrs. l selected "no waking up".

when the screen comes back on.. it lets the tablet get updates. normally there are none, because I have already taken care of them via the smartphone.

now the Note8 sleeps .. and only uses about 1% every 3 to 4 hrs.

I estimate about 10% per day lost if left alone sleeping.

I think if I left the tablet alone for a week.. it would still have a charge!

created a tread of this here:

http://xdaforums.com/galaxy-note-8-0/general/deep-sleep-battery-saver-to-save-battery-t3015530
[Galaxy Note 8.0 (Tablet) General] VIPNobie:
Hi. So I've read that the quick battery drain is not an isolated problem. However, I'm still hesitant in pulling the battery out as this is a work-issued tablet. Will reverting back to an older firmware (4.2.2) fix the battery calibration issue? Thanks!
[Galaxy Note 8.0 (Tablet) General] Dan330:
no.. I have not read anywhere that reverting back to older android version would fix the issue.

but it would not hurt to try.. if you wish..

if it is a work tablet.. then work might have a tech team.

have them do the battery unplug. this might also help them to solve other workers that have the same issue with their Note8s.
[Galaxy Note 8.0 (Tablet) General] cybershawngates:
Only thing that fixed it is the battery disconnect and I went with CM11. for many months things were great. For some reason, I recently decided to go back to stock samsung and the drain came back. So I'm in the process of disconnecting it now and will just stay on CM11/12 and avoid stock. must be something in the stock firmware 4.4.2 and possibly older.

---------- Post added at 09:42 PM ---------- Previous post was at 09:33 PM ----------

No, there is something definitely to this. I just drained by tablet all the way to 0% (it went skipping from approx 35->14%->4% in a matter of a few minutes). I took the cover off, let it wait 10 mintues (instead of the full hour even) and plugged connector and I am at 35% (from 0%!? earlier). And to prove that 35% is real I am able to continue watching netflix....
[Galaxy Note 8.0 (Tablet) General] rtiangha:
It's because the stock ROM has Samsung's DVFS implementation enabled by default. If you want to stay on the stock ROM, you need to root it, install Xposed and then install and activate the Disable DVFS module as soon as you can before DVFS has a chance to bork the fuel chip again.

Easiest way to do that is to configure the stock ROM with Xposed and disable DVFS, and *then* do the battery pull. That way, when it comes back up again, the fuel chip will be reset and DVFS won't have a chance to mess with it again.
[Galaxy Note 8.0 (Tablet) General] cybershawngates:
this is great and makes sense. Best explanation for this issue. It's too bad samsung isn't fixing this (I hope you are reading these posts samsung). My friend has one too, it's his first android tablet, and it's also doing the battery drain thing. He's not someone to root or flash CM (not too tech savvy). Normally he buys ipads and it's embarrasing how an android tablet can be so poorly made. I have an ipad air and I must say the battery life and build quality is exceptional. I can't imagine he'll come back to samsung with quality like this.

Don't get me wrong, I'm a big android fan and hope to see android rule. But I hope samsung gets their act together. I like my note 8, but it's embarrasing to think we have to crack it open to fix this dumb glitch. Samsung please unlock your devices, get rid of touchwiz and bloat and build quality HW.
[Galaxy Note 8.0 (Tablet) General] rtiangha:
To be honest, there's supposed to be a way to reset these things in software, but following the instructions in the data sheet doesn't work.

My guess is either the data sheet is wrong, OR the chips that are having the issue (which, while a sizable number, isn't necessarily all of them) weren't built to spec.

To me, the second one makes the most sense; it would explain why not every device may not encounter this issue, and if the faulty chips were built to the wrong pin out, it could be why they work perfectly fine without DVFS. As soon as DVFS is activated, the driver tries to communicate with the chip according to the pin specifications in the data sheet, but if the chip itself is built wrongly, then it's receiving commands on pins in a format it's not expecting and that's why its internal state gets borked until it gets reset by pulling the power.

My friend was working on a Maker project and bought a bunch of a kind of chip he needed for cheap; he couldn't believe the deal he got...until he started working with the chip, and everything was glitchy even though he was doing everything correctly. He scoured support forums for clues but couldn't find anything except for one other report of someone else having the same issue. Everyone else was fine or couldn't replicate the issue. He bought them from China and didn't want to deal with the hassle of shipping them back as the cost of shipping was more than it would have taken to buy new ones. And they sort of still worked as long as he didn't execute that one command. But not doing so would have defeated the purpose of his project.

He being an Electrical Engineer, he got the idea to test the output of the chip as a last resort to see if that yielded any clues and he ultimately found that the data sheet was correct, except everything was off by one pin. So he had to modify the software driver he was using to communicate the way the not-built-to-spec chips were expecting. He also realized why he got such a good deal. They worked fine until he needed to access a rarely used feature of the chip. And everything worked fine after that and he continued on with his project.

I'm paraphrasing, of course. He was telling me about his project at our last local mini-maker faire and I kind of zoned out for a bit. I got the gist of it though, which was he bought a bunch of chips where the labelling in the schematics was off by one pin.

I wouldn't be surprised if the same sort of thing were happening here; these fuel chips work fine except for the faulty ones that bork when they interact with DVFS because they're built incorrectly. But that's just speculation on my part. Who really knows?
[Galaxy Note 8.0 (Tablet) General] server5:
^ Bingo! ^
[Galaxy Note 8.0 (Tablet) General] Johnsmt:
Hi,

I had similar power issues with my Note 8 GT-5120. Bought this tablet about half-year ago, it was losing mobile network suddenly, even though battery life was good.

Then, after I've used device extesively for about one week, battery life got reduced to 3-4 hours of screen time. It was still loosing mobile network, and screen started blinking when power-consuming apps are running. There was no problem when running WhatsApp or other non-power-consuming apps.

In my case, it was definitely not a calibration problem.

I planned to return the tablet to seller, but found this topic and tried to disconnect the battery instead. Then, using needle, bent pins of the battery connector and put the battery back in place.

Using the tablet for a couple of weeks now, and so far have no signal-lost issues, screen time is ~8-9h charging time from 0 to 100% is ~3.5h and charger gets hot during that.

I guess it can also be a problem with battery connector, as contact gets re-established when you disconnect/reconnect it.

Thanks!