Develop Bugs

Battery calibration app

Could someone please develop a good app that would enable the battery to be drained as much as possible and to charge slower so we could all properly calibrate our batteries?

Do we really need this since it's a Li-ion battery? I know Ni-Mh and Ni-Cad has memory effect, but not on the Li-Ion battery.

I was just wondering the same thing today....simply because there seems to be several different methods to do it. Some say charge 8 hours, turn off, charge and hour, unplug, turn on charge 10 minutes. Then other methods say to do something different....be nice to have an app to walk you through different methods so you know step by step your doing it right

I calibrated mine last night and I'm going to get about 18 hours if not more from it....before yesterday I was getting 9.
The ONLY other different I did was make some profiles on CPU but I cant imagine it would make that much of a difference. I bet its a mix of both

deonjahy said:
Could someone please develop a good app that would enable the battery to be drained as much as possible and to charge slower so we could all properly calibrate our batteries?
Click to expand...
Click to collapse
That is to funny I was just saying to my wife the other day that I should make one of these programs seeing that there are none already. I hate having to manually kill my battery every night before I charge it again.
Is it needed? It depends on your school of thought, some say yes, some say no. All I know is that on the few devices I have had in the past, if I constantly plug them in to "top them off" then the battery never ends up lasting very long after a few months of doing that. So I am a believer in killing the battery before charging on devices like these.
So the bottom line is if there is a desire for this, I may try to put an app together for it, as I know myself I am interested I just didn't think many others would be.

All the battery calibration tools, are basically deleting the file... right?
Is it that hard to boot into recovery and wipe battery stats?

deonjahy said:
Could someone please develop a good app that would enable the battery to be drained as much as possible and to charge slower so we could all properly calibrate our batteries?
Click to expand...
Click to collapse
I think the second part has to do with hardware. The phones hardware just doesn't have trickle charge implemented and instead lets it drop back down to 90% then starts charging it again.
As for the second part, it came on our phones, even has a default widget. 4G
paulieb81 said:
That is to funny I was just saying to my wife the other day that I should make one of these programs seeing that there are none already. I hate having to manually kill my battery every night before I charge it again.
Is it needed? It depends on your school of thought, some say yes, some say no. All I know is that on the few devices I have had in the past, if I constantly plug them in to "top them off" then the battery never ends up lasting very long after a few months of doing that. So I am a believer in killing the battery before charging on devices like these.
So the bottom line is if there is a desire for this, I may try to put an app together for it, as I know myself I am interested I just didn't think many others would be.
Click to expand...
Click to collapse
Um... actually that is (by most accounts) bad for Li-Ion. You want to AVOID completely draining them. All of this stuff is more art than science, but I have way more often heard that completely draining LI batteries is bad. What kills them is the number of cycles they have been through (like -25 +25, -25 +25, -50 +50 would be a full cycle).
You do however want to give them a full up down cycle once in a while (maybe every 1-3 months) for calibration.
Then again, as I said, it is more art than science, and I have heard your method as being better, but the not draining argument seems to be the vast majority.
I'll try to do a little look-see and update this or repost if I find any stronger evidence.

the thing about my phone and battery that ALWAYS baffled me was i would plug it in at night be it at 10% or 22 i would leave plugged in while slept i would wake up unplug and look at battery percentage and it would be like 95.....no other phone has even unplugged and dropped 5 percent by doing nothing????

turn your brightness to 100% and change it so that it never turns off; use wifi tether and play a 720p movie at the same time; oc your kernel to it's highest stable frequency. it'll drain pretty quickly.

I know I might get flamed for this....
Apple suggests, with their laptops, to once a month or so, run the battery completely down. Then let the battery cool down for a little bit. Then give it a full, uninterrupted, overnight charge. I forget if they said to repeat this a second time, then you're good.
This is all from memory of me reading this a couple years ago or so, so our might not be verbatim. Their laptops use lithium ion technology...
(and they used to blow up and melt down too!) Lol!
Wrong word choice and misspelling courtesy of swype.

mykeldrip said:
the thing about my phone and battery that ALWAYS baffled me was i would plug it in at night be it at 10% or 22 i would leave plugged in while slept i would wake up unplug and look at battery percentage and it would be like 95.....no other phone has even unplugged and dropped 5 percent by doing nothing????
Click to expand...
Click to collapse
That's because the phone stops charging when it reaches 100%, and runs off of battery probably until it reaches in the low 90s, then charges again. You won't ever notice this because the light will always be green. However, you'll notice that unplugging it a few moments after it turns green, the battery will stay anywhere from 100%-98% for a while. At least on my phone it does.

Is there any way to make this program "auto run" during sleep so it can do everything it needs to do during the night charge (similar to quickpull for blackberry)

laydros said:
I think the second part has to do with hardware. The phones hardware just doesn't have trickle charge implemented and instead lets it drop back down to 90% then starts charging it again.
As for the second part, it came on our phones, even has a default widget. 4G
Um... actually that is (by most accounts) bad for Li-Ion. You want to AVOID completely draining them. All of this stuff is more art than science, but I have way more often heard that completely draining LI batteries is bad. What kills them is the number of cycles they have been through (like -25 +25, -25 +25, -50 +50 would be a full cycle).
You do however want to give them a full up down cycle once in a while (maybe every 1-3 months) for calibration.
Then again, as I said, it is more art than science, and I have heard your method as being better, but the not draining argument seems to be the vast majority.
I'll try to do a little look-see and update this or repost if I find any stronger evidence.
Click to expand...
Click to collapse
I am by no means an expert so if you find any reliable info on this and can link us to read, I would love to learn more. All I know is that it is commonly said to drain rechargeable batteries and that I have seen that topping them off very often does lead to battery life degradation.

Tyzing said:
Is there any way to make this program "auto run" during sleep so it can do everything it needs to do during the night charge (similar to quickpull for blackberry)
Click to expand...
Click to collapse
There is no need to fully drain the battery. Its purpose in calibration is to configure the software that is correlating voltage to percentage charged. That's all. Regarding the old Apple advice, that is doing the same thing. It will not affect the hardware.
Now, what WILL affect the hardware is charging itself. Every charge/discharge cycle will reduce the total capacity of the battery. This is why the EVO will not cycle on it's own until 10% discharged. It's improving the overall battery life by that restriction.
In short, you will save money overall by getting a higher capacity battery that you don't force to charge too often. Draining your battery does nothing but give you peace of mind and it only really needs recalibrating when it's total capacity has been reduced which isn't often. 3-6 months.
Sent from my PC36100 using XDA App

herbthehammer said:
I know I might get flamed for this....
Apple suggests, with their laptops, to once a month or so, run the battery completely down. Then let the battery cool down for a little bit. Then give it a full, uninterrupted, overnight charge. I forget if they said to repeat this a second time, then you're good.
This is all from memory of me reading this a couple years ago or so, so our might not be verbatim. Their laptops use lithium ion technology...
(and they used to blow up and melt down too!) Lol!
Wrong word choice and misspelling courtesy of swype.
Click to expand...
Click to collapse
Yeah except that's not a good idea, it will kill the weak cells.

I understand. Still think it would be useful if it would do the "juice until LED changes" method while sleeping though

paulieb81 said:
So the bottom line is if there is a desire for this, I may try to put an app together for it, as I know myself I am interested I just didn't think many others would be.
Click to expand...
Click to collapse
I'm interested!

Btw - what are the charging calibrations people are using? Are you seeing one working better than another?

Im a noob, so take what I say worth a grain of salt but yesterday I did the standard method where you fully charge...turn off...plug back in until led changes green and do it a few times.
I went from 9 hours to 17 hours with no other changes except a few profiles in setCPU.
I did this just last night so my results are fresh.

Tyzing said:
I calibrated mine last night and I'm going to get about 18 hours if not more from it....before yesterday I was getting 9.
The ONLY other different I did was make some profiles on CPU but I cant imagine it would make that much of a difference. I bet its a mix of both
Click to expand...
Click to collapse
A few SetCPU profiles is all it takes to see a dramatic increase in battery life, especially while screen off. If you disable it I bet whatever gain you think was from 'calibrating' it disappears.

Battery Charges Only to 99%

I've had my Nexus for about a month, and no matter what ROM or kernel I use it seems that most of the time my battery only charges to 99% an not the full 100%. It will sometimes charge to 100%, but is rare that it happens. I know how to properly take care of my battery, but I'd like to know of this happens to anyone else and if there's anything I can do to fix it. I'm currently using the stock battery.
Thanks.
Sent from my Galaxy Nexus using xda premium

dustrho said:
I've had my Nexus for about a month, and no matter what ROM or kernel I use it seems that most of the time my battery only charges to 99% an not the full 100%. It will sometimes charge to 100%, but is rare that it happens. I know how to properly take care of my battery, but I'd like to know of this happens to anyone else and if there's anything I can do to fix it. I'm currently using the stock battery.
Thanks.
Sent from my Galaxy Nexus using xda premium
Click to expand...
Click to collapse
Android has been like this since at least Gingerbread. It's not new or a problem. Some phone manufacturers make it read 100%, but Nexus devices report what it actually is. You can turn the screen on when it's at 99% and start charging that way if you really need that last 1% .

I've had that happen a few times. Go to /data/system and delete batterystats.bin and then plug in your phone. It should then charge to 100%.
Sent from my toroplus

Redneck Trash said:
I've had that happen a few times. Go to /data/system and delete batterystats.bin and then plug in your phone. It should then charge to 100%.
Sent from my toroplus
Click to expand...
Click to collapse
Agreed, deleting you bat batterystats.bin will allow the phone to charge to 100%. It's pretty common lately, I have had it happen 3 times after the second I gave up. 99% is good enough for me.

mwalt2 said:
Android has been like this since at least Gingerbread. It's not new or a problem. Some phone manufacturers make it read 100%, but Nexus devices report what it actually is. You can turn the screen on when it's at 99% and start charging that way if you really need that last 1% .
Click to expand...
Click to collapse
I dunno, I've been using gnex for 6 months and never had that problem?

As far as I'm aware, most smartphones when continually connected to a charger will charge to 100%, stop charging, allow the phone to discharge to 95%, and then begin charging again. This prevents over-charging, which would potentially damage the battery.
I rarely find my Nexus at 100% when it's on the charger. It's usually at 97-99%.

Redneck Trash said:
I've had that happen a few times. Go to /data/system and delete batterystats.bin and then plug in your phone. It should then charge to 100%.
Sent from my toroplus
Click to expand...
Click to collapse
Enkriptd said:
Agreed, deleting you bat batterystats.bin will allow the phone to charge to 100%. It's pretty common lately, I have had it happen 3 times after the second I gave up. 99% is good enough for me.
Click to expand...
Click to collapse
:facepalm: No, it will not. Batterystats.bin has absolutely zilch, zero, nada, to do with it. I have no idea why people, including some who should know better, continue to perpetuate this bit of misinformation. The only thing deleting batterystats.bin does is erases the list of processes that have used the battery. It has no bearing on the percentage reported.
To the OP- one of the primary reasons that you don't see it often make it to 100% is that lithium-ion batteries are often throttled just short of a complete charge in order to prolong the battery's serviceable life. Additionally, some will slow to a trickle charge when close to fully charged. At this point, the charge and discharge rates will sometimes negate each other.

najaboy said:
:facepalm: No, it will not. Batterystats.bin has absolutely zilch, zero, nada, to do with it. I have no idea why people, including some who should know better, continue to perpetuate this bit of misinformation. The only thing deleting batterystats.bin does is erases the list of processes that have used the battery. It has no bearing on the percentage reported.
To the OP- one of the primary reasons that you don't see it often make it to 100% is that lithium-ion batteries are often throttled just short of a complete charge in order to prolong the battery's serviceable life. Additionally, some will slow to a trickle charge when close to fully charged. At this point, the charge and discharge rates will sometimes negate each other.
Click to expand...
Click to collapse
Deleting the file got my phone to report 100%. I know it shouldn't matter. Although I never encountered this issue on ICS. Only started on JB.
Sent from my toroplus

Redneck Trash said:
Deleting the file got my phone to report 100%. I know it shouldn't matter. Although I never encountered this issue on ICS. Only started on JB.
Sent from my toroplus
Click to expand...
Click to collapse
Actually, it didn't. You're equating correlation with causation. What would have gotten your phone to report 100% is some other variable that actually has bearing on battery charge.
Dianne HackbornJan 12, 2012 - Public
Today's myth debunking:
"The battery indicator in the status/notification bar is a reflection of the batterystats.bin file in the data/system/ directory."
No, it does not.
This file is used to maintain, across reboots, low-level data about the kinds of operations the device and your apps are doing between battery changes. That is, it is solely used to compute the blame for battery usage shown in the "Battery Use" UI in settings.
That is, it has deeply significant things like "app X held a wake lock for 2 minutes" and "the screen was on at 60% brightness for 10 minutes."
It has no impact on the current battery level shown to you.
It has no impact on your battery life.
Deleting it is not going to do anything to make your more device more fantastic and wonderful... well, unless you have some deep hatred for seeing anything shown in the battery usage UI. And anyway, it is reset every time you unplug from power with a relatively full charge (thus why the battery usage UI data resets at that point), so this would be a much easier way to make it go away.
Click to expand...
Click to collapse

najaboy said:
Actually, it didn't. You're equating correlation with causation...
Click to expand...
Click to collapse
Source: https://plus.google.com/u/0/105051985738280261832/posts/FV3LVtdVxPT
And I like this reply to a comment even better:
+semeon korsunsky You say "ever since my first android(g1 oct 2008) and every android device ive owned since, the batterystats.bin file has always lost accuracy with a short amount of time," but in fact there was NO batterystats.bin file in early Android. I think the first release this ever appeared in was Cupcake, and that was just some early experimental work I was doing to try to quantify application behavior by sticking in instrumentation of interesting potential power-related things they were doing.
I will say that I don't know for sure what all of the various devices are doing... however, I know exactly what the battery stats code on the G1, Nexus One, and Nexus S does. I wrote it. And I can assure you there is nothing it does that has any impact on battery level reporting or battery draining (aside from whatever work the code itself does that would use power).
Frankly, arguing that deleting the file is having any impact on the reported battery level on these devices is the same as arguing that the sun orbits the earth. It just isn't true, and you can go right into the code and see this for yourself.
Click to expand...
Click to collapse

How to stop screen dimming at 5% power?

Hi,
I'm trying to run through a few charge cycles with my new N5100 but when it gets to 5% power it turns off the brightness (i.e. no backlight) and the brightness setting is disabled, meaning that I can barely see the screen.
Is there any way of stopping this automating dimming so that the brightness remains on all the way down to 0%?
Thanks,
Coj

Thank you very much indeed!
That "feature" is bugging me beyond belief!
How on earth is it possible that Samsung is implementing this without an option to disable it?!?
I mean, it's a business device with a battery big enough to have 5% equal more than 30 minutes of screen time.
30 minutes can be quite crucial if I'm in the middle of a meeting or trying to figure out my train departure time.
You can't see a thing if the screen is dimmed down to 5%!
Any workaround and/or fix is greatly appreciated!
Regards,
Yoko

Yokobln said:
Thank you very much indeed!
That "feature" is bugging me beyond belief!
How on earth is it possible that Samsung is implementing this without an option to disable it?!?
I mean, it's a business device with a battery big enough to have 5% equal more than 30 minutes of screen time.
30 minutes can be quite crucial if I'm in the middle of a meeting or trying to figure out my train departure time.
You can't see a thing if the screen is dimmed down to 5%!
Any workaround and/or fix is greatly appreciated!
Regards,
Yoko
Click to expand...
Click to collapse
I think this is when the power saving mode is enabled automatically. Try turning it off in the settings. This is how it is on my note 2.

emwno said:
I think this is when the power saving mode is enabled automatically. Try turning it off in the settings. This is how it is on my note 2.
Click to expand...
Click to collapse
Nope! I enabled everything, disabled power saving just to try to get the unit to turn off to complete the discharge cycle but the screen remained dimmed...it's really frustrating.

Im no expert, but isn't that bad for these batteries? I'm pretty sure doing that does more harm than good.
Sent from my SGH-T889 using Xparent Skyblue Tapatalk 2

Warrior1975 said:
Im no expert, but isn't that bad for these batteries? I'm pretty sure doing that does more harm than good.
Sent from my SGH-T889 using Xparent Skyblue Tapatalk 2
Click to expand...
Click to collapse
Yes, you are correct. What these people are trying to do is not only a waste of time, but directly harmful to the battery chemistry.

So what constitutes a full discharge cycle then? I bow to your superior knowledge!
Sent from my GT-N5100 using Tapatalk HD

cojones said:
Nope! I enabled everything, disabled power saving just to try to get the unit to turn off to complete the discharge cycle but the screen remained dimmed...it's really frustrating.
Click to expand...
Click to collapse
There is no benefit to discharging to shutoff. If you are trying to get the battery meter as accurate as possible, just discharging to 10, or even 20% is plenty. The meter is not all that accurate under the best or circumstances to justify going anywhere below 10%.
Charge to 100%, let it sit on the charger for a while, to make sure you get the saturation charge. Then use until 10 or 20%. That is as much of a "full discharge cycle" you need for the purpose of calibrating the battery meter.
Also, discharge until the device shuts off, and you might find the device won't take a charge or power on anymore. The safety circuit is supposed to prevent the battery from over-draining (voltage below changeable threshold). But its not failsafe. Somewhat rare, but I've seen it happen to a number of XDA users on various Android devices. Usually, charging overnight will bring the battery back. Sometimes . . . not.

cojones said:
So what constitutes a full discharge cycle then? I bow to your superior knowledge!
Sent from my GT-N5100 using Tapatalk HD
Click to expand...
Click to collapse
No reason to get all sarcastic. This is a place to learn, lots of people are very knowledgeable, most more than the next. You think your way is right, then continue. Or perhaps, take a step back and maybe learn a little more before doing things.
Sent from my SGH-T889 using Xparent Skyblue Tapatalk 2

We could get deep into LiIon or LiPo chemistry if we wanted to, but just to clear up an thing or two....
- I fully expect a device in that price range from a manufacturer like Samsung to not take *any* damage if I discharge the tablet. I am fully aware of the damage that can be done to these battery cells by deep-discharging them as I use them on a regular basis in RC aircrafts. I also know that there is a quiet sophisticated dis/charge protection circuit built in any (serious) device that is using these type of cells. The battery aswell as the notebook / tablet have those built in.
It should not not be possible to deep-discharge any device from a reputable company unless you let it sit on your desk for months without charging it at all. It's shut of by the controller long before that happens.
- I fully expect to be able to use all battery power until the above mentioned controls kick in and power the unit down hard. This goes for any notebook, mobile phone or tablet. There are many devices on the market that do not force you to use the device for half an hour at 5% brightness before shutting down. Why? The damage (if there was any) would be the same. Half an hour at 5% or 7 minutes at 100% brightness ..... the battery doesn't care.
- Unfortunately we live in a world where we exchange our gadgets every 2 years. What do I care if the battery performance degrades to 75% three years from now. Samsung certainly doesn't, or they would have made the battery replaceable in the first place (which I would appreciate a lot, even if that came with 2mm extra thickness + 35 grams of additional plastic)
Sorry for typos... me = german
Regards,
Yoko

Warrior1975 said:
No reason to get all sarcastic. This is a place to learn, lots of people are very knowledgeable, most more than the next. You think your way is right, then continue. Or perhaps, take a step back and maybe learn a little more before doing things.
Sent from my SGH-T889 using Xparent Skyblue Tapatalk 2
Click to expand...
Click to collapse
I was not being sarcastic. You read it that way and if you took it as sarcastic then that says more about you than me. Do not pass judgement that ultimately is futile and unhelpful to all.
I was being genuine when I say I bow to your (pl.) superior knowledge...I really do. The reason I'm on here is to learn in order to get the best experience. It just so happens that many years ago when I started, the batteries required regular full discharge cycles, so that was my current understanding until guidance was provided to change that.

I apologize for my statement, I took it the wrong way.
Sent from my SGH-T889 using Xparent Skyblue Tapatalk 2

Yokobln said:
We could get deep into LiIon or LiPo chemistry if we wanted to, but just to clear up an thing or two....
- I fully expect a device in that price range from a manufacturer like Samsung to not take *any* damage if I discharge the tablet. I am fully aware of the damage that can be done to these battery cells by deep-discharging them as I use them on a regular basis in RC aircrafts. I also know that there is a quiet sophisticated dis/charge protection circuit built in any (serious) device that is using these type of cells. The battery aswell as the notebook / tablet have those built in.
It should not not be possible to deep-discharge any device from a reputable company unless you let it sit on your desk for months without charging it at all. It's shut of by the controller long before that happens.
Click to expand...
Click to collapse
I'd say that the danger is less about actual chemical damage to the battery; and more (as I've previously mentioned) that the voltage will drop too low for the battery to take a charge from the standard charger.
In theory, the protection circuit is meant to prevent this. Unfortunately, its not failsafe (and nothing ever is) in reality. I've seen it happen plenty of times before on other Android devices, and good quality ones (HTC One X, Desire Z, etc.) where folks have let the battery drain to shutoff, and the battery will no longer take a charge. I wouldn't call it "common", really more of a rarity. But of course, there is always that possibility that Murphy's Law is going to decide that you are "that guy", and than that really sucks.
In some of these instances, letting the device sit on the standard wall charger overnight will get it working again. But sometimes, this doesn't work. In that case the solution was a battery meter with "boost" function which out get the battery back up to the proper voltage. But this equipment is typically only found in specialized repair shops. Buying a new battery was a simple and reletively cheap alternate fix on some past devices. But since the battery is not meant to be customer replaced on the Note 8, this is less of a feasible fix.
Again, this issue in uncommon, but it exists. We all let our devices drain too low by accident, at one time or other. But why tempt fate and probability? There is simply no good reason to drain the device to shutoff on a frequent and intentional basis.

One of my buddies is waiting on a new Nexus 7 tablet because he accidentally let it drain completely and it wont take a charge.
Sent from my SAMSUNG-SGH-I727 using xda premium

Solution to the OP?
For me, at least, this app works:
https://play.google.com/store/apps/details?id=mobi.pruss.superdim

^second, works great. sucks we have to work around but that app works great for me (note 2).
Only bug is when you lock the screen and unlock you have to re-enable rootdim again. Even the "lock" feature doesnt seem to work against the systems 5% force dim.

I found a way to solve the problem using the app llama. Create 2 events:
1: Conditions = battery below 6% AND not chargin; action = screen brightness = 100%
2: conditions = battery above 5 OR charging;
Action = screen brightness = auto.
Works for me with Sgs5mini and 4.4.2 stock rom, rooted
Regards

This is an old thread, but I needed to comment in case someone else was wanting to discharge their zerolemon 100000mah battery and not have the screen or not be able to use their camera. Go to setting, developers options and click stay awake... This works! I've been trying for a while to figure out how to use my phone for the days it takes to run the battery out on this large capacity battery, per the instructions from zerolemon and finally found it by accident.

[Q] Battery calibration anyone succeded?

Battery calibration anyone succeded?
Hi I have a battery calibration problem on my GT-N5110 Note 8.0 that I bought refurbished through amazon. I know it is the calibration since the battery usually drains pretty fast and when it gets to 1% it stays there for around half to one hour of continuous use. Also sometimes when I'm charging it, it jumps from around 60% to 100% and "charged" shows up right after that happens, when I unplug it and use it, then it goes down normally (fast) 1% at a time, even though that big jump while charging happened.
I have tried several "full cycles" without success and haven't been able to find a real way to calibrate the battery meter, neither here or on google, and since I didn't buy it in my country, local samsung support say they can not help me.
I'm on 4.2.2 leak rooted and the drain has been present since I was on 4.1.2 stock.
If someone can get a hold of how to calibrate, it would be really nice if you could share it! Thank you!
Sent from my GT-N5110 using Tapatalk 4

Can someone Help us in this Thread? Pls.. I have the same issue. Dunno if its cos the SD maid I installed deleted my batterystats.bin.. Pls help

http://forum.xda-developers.com/showthread.php?t=2469389
Sent from my GT-N5100 using xda app-developers app

superng888 said:
http://forum.xda-developers.com/showthread.php?t=2469389
Sent from my GT-N5100 using xda app-developers app
Click to expand...
Click to collapse
I tried the battery calibration app before, and really didn't do a thing for me...

I also suffer this weird battery behaviour with the device charging, it will take ages up to about 60%, and then instantly its at 100%
I also get this on the way down... when im using it, the battery drains fast, but when I get to 35 -40%, I then suddenly get the low battery 15% warning flash up, and then im all out of juice.
This is the same whether im on 4.1.2 or 4.2.2 custom or stock firmware
I rarely get more than an hour screen on time, and thats with fairly low brightness and power saving mode on

If someone could some how contact Samsung and ask them about the real calibration it would be very helpful for us having this issue... Since some don't live in the US and don't get the correct support :what:
Sent from my GT-N5110 using Tapatalk 4

I don't have the same issue,so I couldn't help. Sorry.

I need help with this too!
Battery decreases so quickly when wifi is on! hardly get a days use out of it...:crying:

One method described in the battery performance thread which I've found effective:
"I wanna share my trial of battery calibration that really make a significant different at least till now .. I used to make calibration by discharge / charge cycles, but this time i add an official instruction of Apple:
- discharge the battery by ur normal usage till 1% then let the device play an HD movie till it shut down (that may take some time as it for me takes 4 hours!!) then turn it on to make sure the battery read 0% (my previous calibration the battery always shut down at 1% and I never see that 0% as I was discharging it vigorously) after making sure it is 0% it will turn off by itself anyway.
- now leave ur device turned off for extended time (about 5 hours or more is better according to apple "u could let it while u r sleeping"
- after that turn the device on and plug it in as it is on
- left it charges as it likes (for my trial it takes 7 hours and didn't say charged!! but I had to unplug it as I had to leave the work!)
till now my battery is really significantly improved, hoping to continue like that and I will keep u updated
Hope that helps :good:"
Discharging it completely, leaving it dead overnight then giving it a full charge by plugging in as a soon as it powers on has yielded good results for me. However I've also discovered a severe battery drain bug in stock Kitkat which has nothing to do with battery calibration; using wifi on certain routers causes Android OS wakelock which persists in deep sleep. I use my old Galaxy W as a hotspot for my Note 8 and consistently my battery drains overnight in deep sleep with wifi on. At my workplace we have a Linksys E2500 router, I leave the tablet on wifi throughout the day and don't notice the Android OS wakelock. So if you're having inexplicable battery drain test your Note 8 on different routers.
Sent from my GT-N5100 using XDA Free mobile app

Calibration is a myth... google stated calibration tools do not help with how Android functions with battery management.
I posted my thread about battery and charging cables, and replied an a few topics like this one, yet nobody will search on Samsung DVFS disable or take note of it as being the cause.
Root with saferoot if you have not rooted, install xposed framework if not done so, and Wanam Xposed or Wanam DVFS disable. Since over 10 months now, my battery stats and performance are trouble free.

I was having severe battery drain for a while until I tried something I read about. What you do is carefully open the note up and disconnect the battery for about 15 minutes (they recommend a longer time but I don't see the need). Connect it back up and put the note back together.
It worked for me.
Google it, there's even a video on how to do it.

I was down to 3 hours or so of battery time but bought a replacement battery from a company called New Power 99. Cost $65-ish US and now I can go all day and still have at least 25% when I hit the sack at night. Huge improvement for me! I"m not a heavy user but I take notes at work, do some surfing, then read and surf alot at home at night. So far it's been great! Might think of a replacement battery. Probably cheaper one's out there but I wanted to get what I paid for so shelled out the extra.

rogerperk said:
I was down to 3 hours or so of battery time but bought a replacement battery from a company called New Power 99. Cost $65-ish US and now I can go all day and still have at least 25% when I hit the sack at night. Huge improvement for me! I"m not a heavy user but I take notes at work, do some surfing, then read and surf alot at home at night. So far it's been great! Might think of a replacement battery. Probably cheaper one's out there but I wanted to get what I paid for so shelled out the extra.
Click to expand...
Click to collapse
Hi! Thanks for the info! That's great to hear, one question, did you change the battery yourself? If so, could you provide a hint on which guide you used, that would be verry helpful:good:

The battery came with a DVD that explained it (with really bad music) but the bottom line is you pry the back off, take the 8 screws off, unplug the old - plug in the new and replace everything. Not really hard but, as I said, nerve-wracking! I was afraid I'd screw it up but it was pretty straight forward.

rogerperk said:
The battery came with a DVD that explained it (with really bad music) but the bottom line is you pry the back off, take the 8 screws off, unplug the old - plug in the new and replace everything. Not really hard but, as I said, nerve-wracking! I was afraid I'd screw it up but it was pretty straight forward.
Click to expand...
Click to collapse
That's awesome I would like to buy the same one in case something goes weird and need instructions to follow. Do you remember anything about the seller/model/site you got?

Yeah, just go to Amazon and search for "new power 99 battery replacement kit". Then pick Note 8 from the list. eBay has them too.
---------- Post added at 08:40 AM ---------- Previous post was at 08:37 AM ----------
Actually, here is the URL http://www.amazon.com/dp/B00HXZ8KRA/ref=pe_385040_127541850_TE_item

rogerperk said:
Yeah, just go to Amazon and search for "new power 99 battery replacement kit". Then pick Note 8 from the list. eBay has them too.
---------- Post added at 08:40 AM ---------- Previous post was at 08:37 AM ----------
Actually, here is the URL http://www.amazon.com/dp/B00HXZ8KRA/ref=pe_385040_127541850_TE_item
Click to expand...
Click to collapse
Will do! Thank you very much! [emoji4] [emoji106]

Any time. Hope this works for you. It did for me.

I. Had the same issues, I just took off the back cover and disconnected the cable that connected the battery. I did not need a new battery. The toughest part for me was disconnecting the battery cable... I actually had to take out the 8 screws that held the battery in place, so I could get some leverage. I only had my battery disconnected for only 5 minutes and it solved the problem for me..... Good luck!
Sent from the Heavens and my Note 8-5110

S20U, 15%->0% very fast drain

So I've had my S20U for a while now (almost 3 months), yet today something odd happened. I called my gf with about 20% battery left, we talked for about 30 minutes, then I started using facebook while talkin to her (i was on my home wifi network not 4g) and after a bit it started to drain the battery VERY fast. When i mean fast, I mean i could see the % going down faster then 1% per minute, more like 1% every 30 sec. I decided to quit the call at 2% and few seconds after that the Samsung logo appeared and the phone totally went off, 0%.
Now I charged it back to 100% and after 2 hours of idle its at 98% which seems to be the usual drain while idle (1%) but what I'm wondering is... what the hell happened before? Have had every Galaxy out since S2 and i've never seen a battery drain like that before. I know when battery goes down very fast its usually a sign of a serious problem with battery, but this is a 3 months old phone... since i've had it i've never let it go below 15-20% since i know its bad to let it go that down and i usually start charging it at 20%, is it possible that maybe it was calibrated bad and thus it drained so fast?
Any other ideas? Thank you.

No clue?

- Are you using superfast charging? This will deteriorate the battery quicker.
- Never let the battery (if you can) drop below 20% & avoid charging above 85% , there is enough data available to show that charging between this 65% dynamic slows the battery wear cycle considerably.
- You called with 20% , while having WiFi on & scrolling Facebook (animations use GPU power , The display drains most the battery - WQHD by any chance?)
With the utmost respect this sounds normal particularly if you let the battery die & charge to full using 3amp power output
Sent from my Samsung Galaxy S20 using XDA Labs
=== Apologies I did not see you state that you don't let it drop below 20% ?? avoid charging above 85% , i use accubattery for this ===

know.i.dee said:
- Are you using superfast charging? This will deteriorate the battery quicker.
- Never let the battery (if you can) drop below 20% & avoid charging above 85% , there is enough data available to show that charging between this 65% dynamic slows the battery wear cycle considerably.
- You called with 20% , while having WiFi on & scrolling Facebook (animations use GPU power , The display drains most the battery - WQHD by any chance?)
With the utmost respect this sounds normal particularly if you let the battery die & charge to full using 3amp power output
Sent from my Samsung Galaxy S20 using XDA Labs
=== Apologies I did not see you state that you don't let it drop below 20% ? avoid charging above 85% , i use accubattery for this ===
Click to expand...
Click to collapse
20% > 85% gives you 65% capacity, if the aim is to prevent battery wear, you've already just lost 35% anyway, defeats the point...
0>100% until the battery only holds 65% charge will give you way more life before you're stuck with 65% capacity, which would take years and years anyway
Not seen any data on super fast charging causing higher battery wear, I know its been a worry to people for a long time but no actual evidence, in fact I've read articles saying it does not.

Ok thanks for the replies but, let me make some points:
1 - S20U has a very fast charge for a reason. If it hurt the battery THAT bad, it would not be there. If Samsung put it there, it means they have done a lot of testing, and yes while I agree that after a year or so using it all the time you might stress the battery a bit more than with slow charge, for sure it doesnt happen after less than 3 months, and to the point of what i experienced.
2 - Again, whIile it is true that modern batteries are better kept between 20 and 80% (and its suggested when you, for example, decide to pull a battery out and keep it in a box), its also NOT true that not doing so will ruin your battery fast. I mean, your phone is made to be used, whats the point to charge it to only 80% and then have no power left during day when you're out and need it? Its just stupid. Everyone going out to work in the morning will charge it to 100%.
3 - Both 1 & 2 will help battery but thats something you'd see after a LONG TIME of using it, and the gain you see would be so little (probably about 10% ish over 20 months) that is really not even worth following those guidelines, its easier to replace the battery (or the phone, in my case, since I buy the newest model every year).
4 - What I experienced Is VERY different and for sure didnt happen for reason 1+2. And no, I always make calls while using Facebook and I've never seen the % go down that fast, like 1% every 30 sec like the other night. Something was draining the battery like I've never seen before in 9 years of Samsung Galaxy. And it happended below 20% so I'm not sure that has to do with it or not (in other words: if my phone was at 70%, would i still have had a drain so fast? who knows, maybe the problem was under 20% that was not calibrated right, but im not even sure this is possible, this is why i opened this topic).
5 - PS Most importantly: Ive never let it go below 15% since I've had it, and i probably charged it fast one time or two, i usually charge it wirless with slow recharge, so again, 1&2 makes even less sense in my case.

Ok update, it happened again. Was at 15% and i was on the phone while playing with facebook, after a while goes to 10% so i killed all tasks and shut down the screen and just talked on the phone, after less than a minute i turned screen on again to check % and was 1%. Went from 10% to 1% in about less than 60 seconds of screen off. Any idea what could be the problem?

tharghan said:
Ok update, it happened again. Was at 15% and i was on the phone while playing with facebook, after a while goes to 10% so i killed all tasks and shut down the screen and just talked on the phone, after less than a minute i turned screen on again to check % and was 1%. Went from 10% to 1% in about less than 60 seconds of screen off. Any idea what could be the problem?
Click to expand...
Click to collapse
Although it could be a battery issue as advised above I'd firstly try a factory reset and install all apps as new.
If this doesn't work a call/visit to Samsung may be the best option.

bomp306 said:
Although it could be a battery issue as advised above I'd firstly try a factory reset and install all apps as new.
If this doesn't work a call/visit to Samsung may be the best option.
Click to expand...
Click to collapse
I was suggested to try using *#0228# anyone got experience about it?

https://accubattery.zendesk.com/hc/en-us/sections/202397985-AccuBattery-Research-and-Methodology
Here's some research conducted by folk who can go beyond speculation
Sent from my Samsung Galaxy S20 using XDA Labs
---------- Post added at 05:45 PM ---------- Previous post was at 05:42 PM ----------
tharghan said:
Ok thanks for the replies but, let me make some points:
1 - S20U has a very fast charge for a reason. If it hurt the battery THAT bad, it would not be there. If Samsung put it there, it means they have done a lot of testing, and yes while I agree that after a year or so using it all the time you might stress the battery a bit more than with slow charge, for sure it doesnt happen after less than 3 months, and to the point of what i experienced.
2 - Again, whIile it is true that modern batteries are better kept between 20 and 80% (and its suggested when you, for example, decide to pull a battery out and keep it in a box), its also NOT true that not doing so will ruin your battery fast. I mean, your phone is made to be used, whats the point to charge it to only 80% and then have no power left during day when you're out and need it? Its just stupid. Everyone going out to work in the morning will charge it to 100%.
.
Click to expand...
Click to collapse
If your battery was supposed to last forever then there'd be less financial return
Learn about procurement & future proofing from a business perspective
It amazes Me that people in 2020 think that conglomerate corporations entertain ethics
https://accubattery.zendesk.com/hc/en-us/sections/202397985-AccuBattery-Research-and-Methodology
Sent from my Samsung Galaxy S20 using XDA Labs
---------- Post added at 05:54 PM ---------- Previous post was at 05:45 PM ----------
An additional caveat is the fact that the note 4 was (I think) samsungs last flagship that allowed for removable batteries , hence so many folk still use the phone today.
This notion does not help Samsung ; sentiment to their moral stance , or lack of.
Business is business eh ??
Sent from my Samsung Galaxy S20 using XDA Labs

know.i.dee said:
https://accubattery.zendesk.com/hc/en-us/sections/202397985-AccuBattery-Research-and-Methodology
Here's some research conducted by folk who can go beyond speculation
Sent from my Samsung Galaxy S20 using XDA Labs
---------- Post added at 05:45 PM ---------- Previous post was at 05:42 PM ----------
If your battery was supposed to last forever then there'd be less financial return
Learn about procurement & future proofing from a business perspective
It amazes Me that people in 2020 think that conglomerate corporations entertain ethics
https://accubattery.zendesk.com/hc/en-us/sections/202397985-AccuBattery-Research-and-Methodology
Sent from my Samsung Galaxy S20 using XDA Labs
---------- Post added at 05:54 PM ---------- Previous post was at 05:45 PM ----------
An additional caveat is the fact that the note 4 was (I think) samsungs last flagship that allowed for removable batteries , hence so many folk still use the phone today.
This notion does not help Samsung ; sentiment to their moral stance , or lack of.
Business is business eh
Sent from my Samsung Galaxy S20 using XDA Labs
Click to expand...
Click to collapse
Sorry to say but your post does nothing to fix my problem (which is the reason why i started this thread) and only adds noise. Nobody said a battery is supposed to last forever. What we said is that you arent very smart if you buy a 1370 Euro phone and then charge it very slow all the time, keep it always between 20 and 80%, and never charge it to 100%, and all this to have the battery last a bit longer after 2 years. If you buy a 1370 Euro phone chances are that the next year you wont even have the same phone, and if you still have it after 2 years, 55 bucks for a new battery is nothing.
In other words, doing everything to preserve battery is just retarded, its a matter of cost vs gain, its just not worth. And telling people not tu use very fast charge because it will deteriorate battery quicker IS RETARDED, period. Because you assume that after a year the difference between a phone using always very fast charge, and using slow charge, is huge, meanwhile it isnt. The real problem with batteries is that they deteriorate over time no matter what. You could be super careful but still after 3 years your battery will be nowhere as good as it was when it was new, degrading it a bit with fast charge or charging to 100% makes very little difference in the big scheme of things. And people at accubattery are stupid, they tell us to stop charging the phone at 80%. Hello, I'm supposed to buy a 1370 Euro smartphone and leave home in the morning at 80% and be careful about what i do during the day because it could drain my battery and then go even below 20, or even totally run out since i started at 80%? Or maybe they think people buy a phone like that to use it while sittin their asses off on a chair playing on the pc and charging always between 20 and 80%? Come on, nosense at its best. You buy a phone to USE it. You buy an expensive smartphone to freaking use it as much as you can. Nobody at Apple tells iphone users "hey dont do this, dont do that, dont charge too many times, dont charge too little, bla bla".
PS if you're so worried about using the phone like you should do, dont install and save too much stuff in the internal memory, it'll wear out in the long run. hell, dont even use it too much, the screen itself isnt infinite.

I was on the 20%-80% bandwagon for a while, but just created more battery anxiety (hypervigilance about going below 20% and "overcharging" above 80%). I finally acknowledged that I never keep a phone long enough to see any real benefit of coddling the battery this way. Now I just use my phone how I want to use it, charge it when it needs to be charged, and don't obsess about long-term battery health. If I *do* keep a phone long enough to notice battery degradation, then I'll just replace the battery. The $100 or whatever it costs is worth not worrying about keeping the battery within some magical range.

---------- Post added at 09:16 AM ---------- Previous post was at 09:05 AM ----------
[/COLOR]
sublimaze said:
I was on the 20%-80% bandwagon for a while, but just created more battery anxiety (hypervigilance about going below 20% and "overcharging" above 80%). I finally acknowledged that I never keep a phone long enough to see any real benefit of coddling the battery this way. Now I just use my phone how I want to use it, charge it when it needs to be charged, and don't obsess about long-term battery health. If I *do* keep a phone long enough to notice battery degradation, then I'll just replace the battery. The $100 or whatever it costs is worth not worrying about keeping the battery within some magical range.
Click to expand...
Click to collapse
?? I'm definitely not anxious , if my battery drains it drains , I'm just saying & simply posed a potential in an attempt to help , doesn't work for you or you don't like it don't entertain it
Maintenance is key to longevity +I'm not into phones like most people. If Swapping phones every frickin year is satiating then yeah go hell for leather , it's ip68 , you could take it in the shower too
Sent from my Samsung Galaxy S20 using XDA Labs
---------- Post added at 09:23 AM ---------- Previous post was at 09:16 AM ----------
tharghan said:
. Nobody at Apple tells iphone users "hey dont do this, dont do that, dont charge too many times, dont charge too little, bla bla".
PS if you're so worried about using the phone like you should do, dont install and save too much stuff in the internal memory, it'll wear out in the long run. hell, dont even use it too much, the screen itself isnt infinite.
Click to expand...
Click to collapse
Just an idea , doesn't help - apologies & ignore it
Do what the feck you want - good luck with your issue
Sent from my Samsung Galaxy S20 using XDA Labs