yashsingh1/xdaforums huggingface dataset:
[Galaxy Note 8.0 (Tablet) General] gramps50:
I have a 5110 and right now my battery is at 65% with a screen time of 3h22m. Power Saver is off, Brightness is Auto. I don't use any of the battery saving apps, for me none I have tried worked. I do run my battery down to below 20% once a month. If it gets below 50% and I am by power I will p;ug it in when I am not using it even if it's onlyb15-20 minutes. Short charges are better than continually running the battery all the way down. On a normal day I will do a full charge over night. If it's above 65% I usually won't put it on the charger at night.
[Galaxy Note 8.0 (Tablet) General] rtiangha:
My note would die after about 3 hours. I tried everything from battery saving apps to trying to discharge beyong 0% in recovery mode. Nothing worked. In desperation, the thing that ended up working for me was taking the unit part and disconnecting the battery for about five hours. Reconnected it, left it plugged in for most of the day before turn in it on, and now I get more than 10 hours on this thing, like other people and reviewers were getting. I love this unit now.

So as a last resort, if you've already tried absolutely everything, try disconnecting the battery for a few hours and see if that'll reset the battery calibration chip. It worked for me.
[Galaxy Note 8.0 (Tablet) General] dewadewi:
could this be the reason of poor battery life?

and how to disconnect the battery from the unit or in any way, reset the fuelgauge soc may I ask?

I also suspect the battery capacity detection posibbly goes wrong... after doing some googling the note 8 use economically (shame on u samsung) max17047 fuelgauge, which is doesn't have true capacity sensor but it relies on a model which observe and study long term voltage activity which is called the m3 modelgauge...

what I'm afraid is the magnetic case that I use before (no longer being use because the case causing the device to turn off if the magnetic part touch the back area) or device miss use on early fuelgauge learn phase (ie, frequent restarting the device) may cause the detection false and inaccurate.

other thing's that I've observed is when the device on heavy load, gaming for example's the battery voltage is drop down very deep which causing the battery capacity detected drop very quick, but after the device load dropping and entering relax state the voltage is increase and corrected, unfortunately the battery capacity wasn't corrected, could this be the reason why the battery droping very quickly while gaming?

but I heard is that we can force the fuelgauge to forget what it's has learned by remove the battery or reset the SOC, but couldn't find any proper way to do that...
[Galaxy Note 8.0 (Tablet) General] fajabird:
Seems very similar to my problem:

My unit won't charge correctly anymore, i.e. charger will not become warm and percentage will increase very slowly (like 10% in an hour). Then (I'm using the app battery logger to monitor the charging process) the percentage will jump from e.g. 14% to 100% suddenly, and charging stops. While the tablet "thinks" it received 100% charge it did'nt actually because it charged just an hour and did so even without taking the necessary current (charger not becoming warm), and after disconnecting the charger voltage will drop to e.g. 3,7 Volts. Then I reboot the unit (will boot with e.g. 93%) and I charge it again. This time charger becomes warm and it take 3 hours to get from 93% to 100% which is fisible (this time voltage drops only to 4,03 after disconnecting). To me it seems the gauge is the culprit not the battery. I already tried to clear batterystats.bin after charging to 100% and verifiing the voltage is not dropping below 4volts. Then I let the tablet to go off at 0% and tied to fully charge it again - but same issue (will not charge lineary to 100% but will jump at some point and charger is cold)!!! It always takes me multiple attempts to get the battery charged above 4 volts.

NOW reading this post I tried this:

echo "1" > /sys/class/power_supply/battery/batt_reset_soc

according to the source-code of "battery-factory.c" it should react upon receiving an "1". It did this after charging to 100% and clearing batterystats.bin in the same time. I will report my results soon. Honestly I'm very close to returning my unit for service.

BTW. I'm using the orgininal magnetic sleep-wake-up-cover from hour 0. I'm on the latest UK-stock-rom (rooted using framaroot@4.1.2 and OTA-Rootkeeper) flashed via ODIN on my german N5110.
[Galaxy Note 8.0 (Tablet) General] gooberdude:
I noticed my 5110 would suck battery power... but I was installing custom roms, new apps and configurations.

I think clearing cache on all the apps and performing a ODEX helped. Since then I am getting 8+ hours.

Yes it is best to let the battery run down before charging. But even better to keep the battery connected to power when able to do so.

I have a 9 year old laptop that is still running on the original battery, and still gets 3 hours of run time when out and about. :o)
[Galaxy Note 8.0 (Tablet) General] rtiangha:
I used these instructions as a guide to disassemble the unit and unplug the battery:

http://xdaforums.com/showthread.php?t=2337067

But if there's a way to reset the fuel chip via software, that would be better.

---------- Post added at 06:20 PM ---------- Previous post was at 06:07 PM ----------

Yeah, I had the same sorts of things. It would sometimes jump in percentages, or quickly discharge but stay at 1% for an hour and a half before finally dying. I tried the same things you did, but I knew it had to do more with the fuel chip's calibration, and the only way I could figure out how to reset it was to physically disconnect the battery for a few hours, and that solved it for me. I'm running stock non-rooted so I can't delete batterystats, but in my case, I didn't need to.

Would love to hear if echo 1 to batt_reset_soc works for you. I wonder if it would work on other devices too?
[Galaxy Note 8.0 (Tablet) General] dewadewi:
actualy I've tried that procedure before posting my previous comment but no luck, but perhaps fajabird gets different result we shall wait n see..

but... on the site there actually is, a way provided by the factory to reset the fuelgauge soc, unfortunately I'm no coder or techsavy... all we need is helping hand from kickass developer :angel:

here is the source link about the max17047 chip's

http://www.alldatasheet.com/datasheet-pdf/pdf/453287/MAXIM/MAX17047.html
[Galaxy Note 8.0 (Tablet) General] 25jan:
If I get 4170 mv on fully charged battery (by *#0228#) ... do u think things is normal or have to do something u mentioned here?

---------- Post added at 11:04 AM ---------- Previous post was at 10:23 AM ----------

Thx 4 the advice .. when dissconnect the battery was the battery fully charged? Empty? Or wt?

Thx
[Galaxy Note 8.0 (Tablet) General] TheNeighbor101:
Gaining Back the Original Full Battery Performance

http://www.flickr.com/photos/92800985@N06/11027793396/

Hello, I'm so glad you posted this, as I was about to sell my Note 8 with its strange battery performance of late. I had all the symptoms you mentioned. I was getting some above 3 hours of actual screen usage time, with sudden power drops and sudden full charging from the 80% mark.

I opened the back based on a YouTube demonstration with the proper tools and disconnected the battery for a few minutes.

After putting everything back together, the battery shot up from 40% range to some 60%+ (the graph below). I'm writing this post with the battery indicated at 28%, with a total of 5 hours of screen time, with my Note 8 passing its 14th hour from the last charge.

I'm just so glad that it's going to give me the usual 7 hours I've first reported last April. Thank you.

I'll be testing this for the next 2 days to be sure and will post my findings.
[Galaxy Note 8.0 (Tablet) General] rtiangha:
Even with my messed up battery chip, it was reporting 4.1 volts when it was "charged" at 100% (which is why it wouldn't charge past that), but who knows if that was really the case? Like I said, the only thing that helped me was to physically disconnect the battery to reset the battery chip and force it to revert to the default curves. Then it would charge properly.

I don't remember the exact percentage it said it was at when I decided to disconnect the battery, but I know it wasn't full. I think it was at 60% before I removed the battery. But like I said, after I reconnected the battery, I left the device off to finish charging; I'm not sure for how long as I did it before I went out shopping.

---------- Post added at 06:25 PM ---------- Previous post was at 06:23 PM ----------

Good to hear that disconnecting the battery worked for you. I'm not sure how long it has to be disconnected for the chip to reset; I did it for half a day as I disconnected it before leaving for work, but it's good to know that it doesn't have to be for that long. Keep us posted!
[Galaxy Note 8.0 (Tablet) General] 25jan:
Thx 4 the reply .. wt max volt it read now when full , using *#0228#
[Galaxy Note 8.0 (Tablet) General] TheNeighbor101:
Status After Unplugging from A Full Charge

Two days ago, my Note 8 would usually end after just above 3 hours of accumulated screen time. Now (after yesterday's battery unplugging to wipe out the battery's memory chip manager) my Note 8 reached that same screen hours with 61% still remaining, after doing some internet browsing, Youtube and playing Plants versus Zombies 2 within the first 3.5 hours after unplugging this morning. You can look at the battery graph here:

http://www.flickr.com/photos/92800985@N06/11044935885/

On the 50% battery level, exactly 5:56 hours after unplugging, I had a total of 4:18 hours of actual screen on usage with further browsing.

http://www.flickr.com/photos/92800985@N06/11045034486/

This was all done with wifi on, using only the default browser, screen on auto brightness, with only Plants versus Zombies & Titanium Backup apps installed. So, in theory, the Note 8 would give me up to 8.5 hours of continuous screen on usage with casual medium graphic gaming and browsing. I used Greenify to hibernate all the apps anyway and this test serves to prove that the managing system for the battery becomes inaccurate after a few months. More on this tomorrow.
[Galaxy Note 8.0 (Tablet) General] Zaybatzu:
How do you disconnect the battery? You opened the tablet?

On my tablet, the battery discharges quickly 100% -> 80% at 1 h 20 min (low use)

Deep sleep is working properly, if the tablet is not used (the battery still 100%).
[Galaxy Note 8.0 (Tablet) General] drezman:
Yup. The back cover can be popped of just like the back of most phones, with a safe removal tool (or a guitar pick or possibly some other slender object) it is pretty simple if you work your way around the cover slowly and don't force anything. I think there was even a link to a video showing how to do this posted earlier in the thread. After the cover is off you simply need to unplug the connector for the battery (it's fairly obvious which connector. The battery is the big white thing that takes up most of the space, and if you follow the wires coming out of the battery you'll see the connector) to undo the connector you need to pry the middle part of it straight up. Sorry if that isn't quite clear, I'll pop the back off and see if I can take a couple pics when I get home.

I left mine disconnected for about an hour, then put it back together and charged it fully and it was a night and day difference. Before I'd be VERY lucky to get 3 hours of screen on time with light use. Now I've got 3 and a half hours and still have 65% left. It also seems to have fixed the weird jumps to 100% when charging.
[Galaxy Note 8.0 (Tablet) General] drezman:
Here are some pics of the back cover removal and the battery disconnection.
[Galaxy Note 8.0 (Tablet) General] rtiangha:
It's weird that so many of us have had the same issues, along with roughly the same runtime (3 hours or so), but good to know there's an easy fix (for those who feel adventurous enough to crack their devices open, that is).
[Galaxy Note 8.0 (Tablet) General] 25jan:
The ppl who dissconnect the battery kindly let us know wt is the reading of max volt on fully charged battery using the *#0228# code .. thx
[Galaxy Note 8.0 (Tablet) General] Zaybatzu:
How to type *#0228# in N5110? I haven't got dialer.
[Galaxy Note 8.0 (Tablet) General] bryanblue24:
Any method how to improve battery life? Custom kernel or custom rom any suggestions? I have newly purchased 5120 and the battery seems to be disappointing. I tried to play injustice it worked flawlessly but it consumes too much battery 35% for just 2 battles, brightness at lowest.

Update, after 2 mins of playing battery just shut off from 45% to 0% and the device powered off. Any fix? Im on stock 4.1.

Also noticed that battery voltage dropped to 3.2v/ 3200 after playing, then while charging, after 5 mins battery voltage went up to 4.2v/ 4200. How to solve this? Any fix/ remedy? Thanks!
[Galaxy Note 8.0 (Tablet) General] drezman:
Here ya go, 4226 mV
[Galaxy Note 8.0 (Tablet) General] bravogee:
TNX! you simplified an otherwise scary procedure--with pics even! my note is now open & battery disconnected..just waiting an hour to reconnect & charge..will post my results later
[Galaxy Note 8.0 (Tablet) General] xonyl:
Mine too! :laugh: Wide opened on my desktop, my colleagues pacing around and staring at me...

---------- Post added at 03:06 PM ---------- Previous post was at 02:59 PM ----------

I really wish it'll work. I barely had 3 hours of screen time / 6 hours overall, these past days.

I have the N5120 model.
[Galaxy Note 8.0 (Tablet) General] TheNeighbor101:
Mine says 3688mV. I'm really getting wonderful screen time at more than 7 hours just like when I first got my Note 8 N5100. I'm doing a test now with power saving off. I'll post a summary of my testings soon.
[Galaxy Note 8.0 (Tablet) General] 25jan:
Waiting 4 ur results ppl :D
[Galaxy Note 8.0 (Tablet) General] intelliriffer:
I can too confirm that it works,

Though i was not having any major battery issues (might be because my tab had already been to service center and had mobo and screen replaced).

Here is a small finding , may or may not be relevant to others.

After you boot your tablet (i.e after reconnecting battery) and charge it to 100% let it sit for a while, use it a bit and reboot.

Mine battery meter got stuck at 100% and was not updating until I rebooted and it went to 98% and has been fine since.

As of mv, with my old mobo it used to max around 4280 mv , with the replaced mobo, it maxes around 4285-4290mv

I use the battery monitor widget to keep track of charge cycles etc. I have seen it 100% at as low as 4265mv at times in logs. so there is a lot of variance in metering so numbers should not be taken for granted as absolutes.

as for Battery Eating : Google Now's location related services seem to be biggest culprit for me in drains. (I am with wifi on 24x7). Turning location services off helps a lot, but might not be feasible to everyone.

Turning on S-pen battery saving also helps a tiny bit (around 0.1% /hr).

btw:Mine is N5100.
[Galaxy Note 8.0 (Tablet) General] rtiangha:
Try the 'Disconnect-Your-Battery-For-An-Hour' trick; it might help as weird voltage spikes seem to be the symptoms of a miscalibrated power chip.

I wish I took better statistics back when I was affected, but when I was having issues, I was monitoring battery voltage and noticed that it would randomly spike downwards before going back up again. Unfortunately, the battery monitor would record the lower percentage, and even though it spiked back up later on, it would still keep it, so the unit thought I had less battery capacity than I had.

I've noticed that after disconnecting my battery, those random spikes in voltage in various directions no longer happens, and the power discharge is much more consistent and stable. Honestly, I really was about to sell this unit as it barely got 3.5 hours before powering off.

---------- Post added at 02:55 PM ---------- Previous post was at 02:51 PM ----------

I've got the Wi-fi version, so no dialer. I'm also running Stock non-rooted at the moment. Is there an app that'll easily display that info? I'd rather not cat something in proc, mainly because I can't remember what flag battery voltage is kept in at the moment, and typing it all in is kinda painful, LOL.
[Galaxy Note 8.0 (Tablet) General] bravogee:
i disconnected battery for an hour & after reconnecting battery, i charged for 7+ hours w/out turning on the unit, i got so scared because after turning on for the 1st time, it booted but blacked out afterwards..i could not turn it on again! it will only boot/turn on if i attach to charger..then i read the post by intelliriffer that he booted his note after reconnecting battery..i again removed battery & reconnected after a few minutes & thank God, note boots normally! been on youtube straight for more than 4 hours already & still 48%! im so happy..thank you all!
[Galaxy Note 8.0 (Tablet) General] 25jan:
Hey ppl I opened it wz something like this :D
[Galaxy Note 8.0 (Tablet) General] fajabird:
Hi all,

some days ago I did reset the soc chip via sys Filesystem, at least I tried to do so. The next 0 to 100 charges looked like this

1. no problems, first charge since problem noticed without a jump, very happy

2. jump at 83% , very disappointed

from now on I did not discharge fully until unit powers down to prevent damage to the battery. charge looked like this

3. 9 to 100% , jump at 93%

4. 5 to 100%, no jump

I will give it some more charges from something between 10 and 5% to 100 and report.

conclusion it that resetting seem to helped at least with charger not being cold anymore. No jumps like from 20 to 100% so far.

I attached some Screenshots:

First is showing possible negative voltage drops. Is that normal, 3.3 volts at 45% charge and then going up to 3.8 volts at 40%?

Second shows charging curves before reset and calilbration (both jumps to 100% and too quick charging without jumps)

Third shows first two 0-to-100% charge cycles after SOC-Reset by Software

Fourth shows next two charge cycles to 100% without running the battery to 0%

btw: screen-on-time never exceeded 4 hours (actually 3+ hours), I'm still very disappointed and close to open up the unit.
[Galaxy Note 8.0 (Tablet) General] fajabird:
Could someone who belives his device is not affected (anymore :)) by this issue (7+hours screen-on-time) post one ore more charging curves as a reference? I would like to see at least one from 0% to 100%. Thanks.

The App I'm using is "Battery log" from the guy "Hwang Tae-rok"@play-store. I like this one because it does just listen for battery-state-changes and is not polling the status, so very battery-friendly.
[Galaxy Note 8.0 (Tablet) General] fajabird:
Hi, tried what you suggested with one variation: after the device powered off twice yesterday and was off over night I switched it on today for another verification and got another 1,5hours usage from the "empty battery" before it swiched off again. I waited for an hour before started to charge it. It charged ok from 0 to 20% and then it slowed down and after reaching 40% it jumped to 100%. NO success for me.

Enough is enough, today I opened up the case and now I wait some hours before I reconnect the battery. I really hope that this fixes my problem. So far it resited everything I tried (your suggestion, clearing batterystats.bin, resetting SOC via software, some other battery calibration procedures).
[Galaxy Note 8.0 (Tablet) General] TheNeighbor101:
I could say my battery has the same performance now as it did after unplugging and replugging the battery. Absolutely ressurected the screen time from 3 hours back to 7.

For those willing to try, only open it with plastic prying tools. Never force open with flat screw driver or anything metal or you definitely damage the exterior.
[Galaxy Note 8.0 (Tablet) General] rtiangha:
I hope it works out for you. Your symptoms sound just like mine. There probably is a way to force a reset with out cracking open the unit; on my Galaxy Tab 10.1, the fuel chip in that unit could be forced to take new voltage readings if you could make it lose about 40% capacity at a constant rate and then let it rest for five hours. It's probably a different fuel chip than in the Note 8, but it's probably the same concept but maybe with different variables.
[Galaxy Note 8.0 (Tablet) General] 25jan:
I can confirm, dis/reconnect battery really works just fine

As for charging it jumps from 97 to 100 yet continue charging after that

Also the deep drops of voltage dissappeared
[Galaxy Note 8.0 (Tablet) General] fajabird:
my note 8 is now on again. this are my findings after disconnecting the battery;

when i booted my unit right after reconnecting the battery the percentage droped from about 90% to about 50% which seems fisible.

i then powered it off and fully charged it over night, now its on again with 100%@4200mV. Before it would not go over 4100mV and mostly it was 4050mV right after disconnecting from charger. seems much better now.

What a diffrence:

After 90 Minutes sceen-on-time (mostly browsing the internet) (over 3 days period!!!) only lost 21%.

Next conclusion is that an "echo 1 > .../batt_reset_soc" seems to have no real impact, at least when issued while tablet is normaly bootet. I tried that multple times, when battery was charges as much as possible and when it was empty as much as possible - no difference, no success. Only disconnecting seems to help like already stated by other guys here. Thank you very much.
[Galaxy Note 8.0 (Tablet) General] oinky_08:
I was also having this battery problem. I can barely reach 3 hours of playing nba 2k14. There is one time that I got 100% to 25% in under 30 mins playing NFS. I tried draining the battery letting it play video with 1% charge and it lasted for about 3 hrs same as many of us here. Then when it finally went off I continuously turn it on again until it turns off again. Then i leave it without charge for almost 3 days hoping it would reset the chip,

(missing it so much) but to no avail. When I charge it up to 100% and turned it on again, same performance only lasted for almost 4 hours browsing via data. I have n N5210 version. Today I opened my tablet and remove the battery connector, I'm leaving it for a couple of hours before turning it on and charging it again. Hope this will solve my problem.
[Galaxy Note 8.0 (Tablet) General] gafri1:
my battery

Screen on 2 hours

i disable radio
[Galaxy Note 8.0 (Tablet) General] fajabird:
I would like to evaluate if the magnetic cover is the culprit or at least is raising the change of getting into problems with the battery. Could everyone who is affected by the issue post if or if not he/she is using an magnetic cover and in case he/she is which one.

I'm using that original samsung flip cover, so +1 for magnetic cover in use from the first day.

Here is the (updated on 03.12.2013) survey summary:

Affected users with magnetic cover: 4 (me, alvinlts, dewadewi, rtiangha)

Affected user with no magnetic cover: 1 (TheNeighbor101)
[Galaxy Note 8.0 (Tablet) General] dewadewi:
I also using the magnetic cover from the 1st day...

not the original samsung flip cover but it not interfere with the s-pen (I tested with drawing line on the very edge of the screen and it's fine) so i guess it's good built quality, however... when the magnetic part touch the back part of the device it's instantly turn the screen off...
[Galaxy Note 8.0 (Tablet) General] intelliriffer:
Been using the magnetic cover since june. no battery issues related to cover.

Mine is a aftermarket one and thus had to remove magnets from back as that was causing s-pen problems, front magnets on cover cause no issues.

also would like to point out that the device is internally magnetically shielded (wacom EMR architecture) to a certain extent from the front/sides but not from the back.
[Galaxy Note 8.0 (Tablet) General] fajabird:
I hope we can count at least one which had no magnetic cover but was affected, it would mean that its not related. At least my original cover by samsung has a magnet on the back and two at the front. The rear one is shielded by the cover itself to some extent.