i9300 Battery Struggle! - Galaxy S III Q&A, Help & Troubleshooting

Hi All!
First I want to thank you guys here, I've learned everything about Android through this forum and others.
But I am facing a weird issue here.
I am running LiquidSmooth 2.5 Official Used to be on CM 10.1's Nightlies
and on The Siyah 1.9.1
I have tried everything to keep my battery fine, but its not working.
Here Are the issues:
1- When doing a HR, if battery level is 100%, it goes down to 3 or 4% and phone reboots multiple times atleast 5-7 until it works fine again, and i have to recharge the battery again. DRIVES ME NUTS
2- The charging is pretty slow now, 5 6 hours would get me to a 70% and not a 100, Tried all ways to charge, and charger and battery are working fine on other phones. though the iPhone Power Brick charged it a bit faster it took about 2 hours to a 100.
3- Discharging is pretty DAMN Fast. it would take the phone 3-4 hours of use MAX and I am out of battery on the 3G and 5-6 on WiFi, I lose about 2 percent every 2-3 Minutes. and when Idle or in DeepSleep which I am sure the phone goes to according to ''BetterBatteryStats'' it would last 7 Hours at best.
4- If Charging the Phone and using, the Battery level still goes down, until it reaches 1% then screen flickers and goes Off and i have to wait for the battery to regain charge on the boot screen with the Battery icon and the Yellow Exclamation Mark, and then After 4% I can reboot the phone, and that cycle would go on and on.
here are the Solutions I Tried:
Flashed CM 10.1 with stock Kernel and with Siyah (Updated Software Everynight)
Flashed LiquidSmooth 2.5 with stock Kernel and with Siyah.
Tried Different CPU Governors (Pegasuq, and Hotplug)
Turned off Unneeded process like (GPS and so on)
Used Different Chargers, Batteries and charging ways that work fine with any other S3 that is running on TouchWiz.
Calibrated Battery by letting it Discharge to 0% then charging to 100% uninterrupted.
I Ran out of solutions, so If someone could please HELP!! :")

Hi there Omar,
1, what exactly do you mean by hard reset ?
2. have you tried a different charger ? or a different charging port ?
3. that is indeed not the best battery life, could you tell us what app's use your battery?
It can be viewed in settings>battery
4. same as 3..

Hard Reset as in Remove the battery while phone is on, or Pressing Volume+ and Power Button.
I Tried 3 Different chargers, Sony Xperia Z, iPhone 5 (Charged it a Bit Faster) and Google Nexus 4 Besides Mine.
I dont have too many apps, actually I Uninstalled most of my apps that wake up the phone from deep sleep like Kik but What mostly uses my battery is Maps While i Dont Use it, 14% and Shazam while not in use also 12%, and the screen ofcourse 24% those are the three top consumers.

Iphone 5 ?? how did you connected it to you s3 ?
ok HR is usually referred when you factory reset your phone, that's just rebooting
But I agree it's not a normal behaviour to fall by 95% each time you pull the battery. What rom are you currently running? are you rooted ?
By the way there aren't really advantages in this kind of reboot FYI.
If you don't use the google maps i suggest disabling it via settings>apps>maps - disable.
Same about shazam try maybe another app like "soundhound" or sony "trackid"

iPhone 5 Power brick and My S3 USB Cable.
I Did disable them.
But still after working on everything I've tried most solutions and nothing is working with it!

Oh ok it's clear now
What about your phone state ? are you running stock/custom rom ?

I am running Liquidsmooth 2.5 Official and Siyah 1.9 Kernel
I Used the Liquidsmooth without the Custom kernel, only its stock one.
and Before I Had CM 10.1 Nightly with the stock Kernel and also with Siyah
Same problem with all combinations, and I Switched to Liquidsmooth because I thought the issue was from the Instability of CM 10.1 due to that its experimental, but seems not.

Well from my experience there are few cm10.1 builds that are working very good, so i guess it's not the problem.
Why not backup your rom and reinstall it(or another one from the development section: http://forum.xda-developers.com/forumdisplay.php?f=1566)
Don't forget when backing up do not backup any system app only user app.

Related

[Q] [HELP] Battery Drain, probably hardware issue

Hi guys, this is not an usual battery drain problem. I am more or less an advanced user of android but I´m writing here because I tried all my ideas and none of then worked.
I have 2 Neo V, stock. One day one of them started to have battery drain. Im talking about 6-7%/hour with no usage, the other one is around 1-2%. So with any use my phone don´t last more than 14h.
I started to check the usual(wifi policy, services running..), and don´t found anything, I switched the batteries between both to see if that was the problem but drain was still in the same phone.
I rooted the phone, tried BetterBatteryStats and CPUspy and all is OK, most of the time DeepSleeep etc.
After all I unlocked the bootloader with the S1tool testpoint etc and flashed some Cyanogen 9 rom + kernel, and the problem still persists.
I think there is nothing I can do and my phone is useless because I suppose I don't have warranty anymore.
Any ideas about what could be? Even if its hardware, what kind of hardware problem can make this high battery drain if the CPU is not working ?
Thx in advance
edit: In HTC we can also flash different RIL´s (radio interface layer) to improve signal db, avoid high battery consumes etc. There is something similar in NEO V? Because I didn´t find anything.
There are a couple things you can do:
1) Did you check that you had mobile signal all the time??, because losing mobile signal is THE biggest battery drain possible
2) Post some BetterBatteryStats screenshots so we can see what's happening under the hood
3) Try a different ROM/Kernel combination, that sometimes helps
And no, there's no RIL flashing here, just different ROMs/Kernel/Baseband combinations
I HAD the same problem
Even I faced a similar problem on my Neo V after getting FXP CM9. FXP 122 was fine. But FXP 123 and 124 drained the battery very badly(No considerable Deep Sleep in CM 9). So I switched to AOSP Polish blood. Battery life was excellent but it lacked customization, so I switched to AOKP v38+ AOSP kernel. Superb ROM but again not so good on battery (but better than CM 9). Yesterday I flashed the FXP 125 kernel. More than 5-6 hrs of WiFi, 15-20 calls and texting and some instagram and I still have 20%. I'm charging my phone now!!
I´ve uploaded some screens of bbs, cpuspy and batterydrain with wifi on and after switching it off.
Hope it reveals something, what really annoy me is the deep sleep activated most of the time, so I don´t really know what to search.
Just as I thought, what's happening to you is what happened to me a year ago and I thought changing phones would help.
Your problem is basically, bad signal, as you can see in screens 4,5 and 7,8 "No Data Connection" and "No or Unknown Signal" are preventing your phone from going into Deep Sleep, the problem comes from bad 3G signal (or just bad network signal if you don't have 3G) and that is known to basically eat up all your battery.
How is the network signal where you are???, because it looks like it's realllllyyyyy bad.
Akath19 said:
Your problem is basically, bad signal, as you can see in screens 4,5 and 7,8 "No Data Connection" and "No or Unknown Signal" are preventing your phone from going into Deep Sleep
Click to expand...
Click to collapse
Are you sure? Take a better look.
Or at least deep sleep graph. And those graphs "No Data Connection" and "No or Unknown Signal", are also ok(ven though the name is confusing a bit), I have the same.
I'm not COMPLETELY sure but this is exactly what happened to me a year ago with a Samsung Galaxy Mini, also if you look at graphs 4 and 7 Deep Sleep doesn't have as much time as the data and signal bars, to me that seems like those two are keeping the phone in wakelock state more than it is spending on Deep Sleep.
I´ve been experiencing this problem for weeks. About signal I tried everything because:
- Phone worked perfect with SIM and all bars (I live in the downtown of a big city)
- When the problem started to happen I switched to another phone and this one was working without SIMcard so there was no signal at all.
- Some days ago I used another SIM which also have all bars.
I Don´t think there is a problem of the signal . Also in my other phone, and as you can see, Deep sleep is working fine.
I reread your first post and the only hardware problem that I could think of is a faulty battery, did you use to leave it charging all night??, because that tends to burn the battery and it does hold a lot less charge.
According to what I've read, everything seems to be fine software side, my only idea would be that you reflashed stock ROM and check if the problem persists, reflash but don't restore any data, the problem could be a misbehaving app.
I have 2 Neo V (my father´s and mine) I switched batteries, and the problem persist in the same telephone. Also both of them have less than 2 months, so batteries are new.
Also revised the voltage in the CPU and it is alright.
Well, the only thing left to check (IMHO) is a misbehaving app or service, maybe check for task killers or battery savers in the "broken" phone, those are known to eat up the battery like it's ice cream!!
I believe I have the same problem. I can't remeber when it started since I tried lots of roms,
but I flashed latest ICS from pccompanion with no other tweaks for some days and it
continued the same.
I also thought about bad signal, but at night in flight mode it also spent 40% of the battery.
With a good kernel, undervolting, 2G... I can get to 15% 20% at night.
I've also switched batteries with other neo's and no difference.
Phone is 5 months old.
Not sure if it might come from the rooting process. If I understand right, the 0% issue
that some were having was more of hardware issue (or I'm completely wrong?) Then maybe
there is also something related?
ambrosiosanchez said:
I believe I have the same problem. I can't remeber when it started since I tried lots of roms,
but I flashed latest ICS from pccompanion with no other tweaks for some days and it
continued the same.
I also thought about bad signal, but at night in flight mode it also spent 40% of the battery.
With a good kernel, undervolting, 2G... I can get to 15% 20% at night.
I've also switched batteries with other neo's and no difference.
Phone is 5 months old.
Not sure if it might come from the rooting process. If I understand right, the 0% issue
that some were having was more of hardware issue (or I'm completely wrong?) Then maybe
there is also something related?
Click to expand...
Click to collapse
0% was a software related error (flashing GB 2.3.3 after having 2.3.4 broke the battery gauge firmware), however that problem doesn't exist on ICS, I find it reallt strange that both your phones have that problem, I've had my Neo for 8 months and the most battery I've lost overnight has been 10% (with CM9 and really bad signal).
Maybe the best thing you guys can do is send your phone to service.
I have a similar problem with my mt15:
when I buy my phone battery was ok. about two days with intensive social use, no gaming.
5 months later, battery drain begins: deep sleep and 8% per hour , airplane mode 8% per hour
tried almost every popular rom in development forum ICS stock, codename, tweaked, cm7.2, cm9, jjhybrid, KA, ...
tried every popular kernel: stock gb, stock ics, alliance, suave, super, nightelf, cm kernels...
battery drain happens while phone ON, happens with airplane mode, AND happens with PHONE TURNED OFF.
I thinked about battery fault. replaced my battery with a new genuine one. Same results.
If I remove the battery from phone, IT does not drain. 24h later battery is still 100%
So my neo has a hardware problem I think. And there are many people with same problem. look for "neo battery drain while off"
Neo is a buggy phone. you can be lucky, or not. but many people has these issues or 0%batt.
I give up!
After sony abandoned x10 mini pro (random reboots, eclair), I had given another chance to sony with neo. I like sony designs, but Im really tired.
sorry about my creepy english
Try freezing "Calendar" with Titanium Backup and see if battery lasts longer. It helped for me.
genyt said:
I have a similar problem with my mt15:
when I buy my phone battery was ok. about two days with intensive social use, no gaming.
5 months later, battery drain begins: deep sleep and 8% per hour , airplane mode 8% per hour
tried almost every popular rom in development forum ICS stock, codename, tweaked, cm7.2, cm9, jjhybrid, KA, ...
tried every popular kernel: stock gb, stock ics, alliance, suave, super, nightelf, cm kernels...
battery drain happens while phone ON, happens with airplane mode, AND happens with PHONE TURNED OFF.
I thinked about battery fault. replaced my battery with a new genuine one. Same results.
If I remove the battery from phone, IT does not drain. 24h later battery is still 100%
So my neo has a hardware problem I think. And there are many people with same problem. look for "neo battery drain while off"
Neo is a buggy phone. you can be lucky, or not. but many people has these issues or 0%batt.
I give up!
After sony abandoned x10 mini pro (random reboots, eclair), I had given another chance to sony with neo. I like sony designs, but Im really tired.
sorry about my creepy english
Click to expand...
Click to collapse
about battery drain when phone is off
its not consuming your battery while its off
when you are turning the phone on
cpu usage will be on 100% to run all necessary sevices and apps and most use goes to get signal
that's normal
i suppose its aroumd 3-5% of battery consume
im not gonna be at the same side with you
actually neo is a wonderful phone
i beated the score of sensation xe in antutu benchmark with it
just google it around the internet
there will be some fix mate..
Neo is not buggy at all maybe yours but not mine
this might work for you
i just found it
1-flash build 42 official rom on your device
2-root the rom (there are plenty of ways around internet)
3-flash this kernel via flashtool forum.xda-developers.com/attachment.php?attachmentid=780407&d=1321113977
4-now turn on the phone its gonna show 85% of battery
5-install this forum.xda-developers.com/attachment.php?attachmentid=897721&d=1329003275
6-plug the charger into your phone
7-from the menu of app select start full charge
its gonna take 3-3:30 to be full
may be you've seen it around web
i translated it from a persian forum
HIT THANKS IF I HELPED YOU
In my opinion, a phone broken by a software update/downgrade is buggy.
About battery draining while off, not all neo have this issue, but mine is not the only one.
On the other hand, about power consumption while booting, if i remove battery while off, wait some hours, and replace, after boot battery is 100%
Sent from my JJ's Hybrid MT15i
I had this problem too, even when the mobile was off, the battery was drained...
I sent my phone to after sales service and now it's normal drain 2 - 3% per hour when idle. (I was on stock rom and kernel, never changed).
There is maybe a bad hardware series

[Q] Phone getting Off

Am using more than 18 months old I9100.
My phone is getting turned off, while using. The last time when phone got off while battery was around 85%. When i try to turn it on it will display boot animation and turning off again. If I turn it on while connecting the charging it will turn on with out issues. It shows 56% of battery still remaining.
I forgot to tell one thing, If am using the phone just to make calls, or watch normal videos it will not turn off. Last time (to test this), I had Wifi, Gmail Sync, Facebook, Media Player and also was downloading temple run 2 from the market while the phone turned off.
Currently am using Wanamlite 14.0 [Philz 4.0], but this issue was there while using Wanamlite 13 and AllianceROM 5.2 [Dorimanx 7.38].
It started while i was using AllianceROM 5.2, earlier i have tried Wanamlite 13 and it was working fine, but when i tried the same ROm later that also have the issue.
Can you please suggest what should i do?
Try different battery.
Try different kernel.
You can make a trip to stockland to see if the issue persists.
Sent from the little guy
TheATHEiST said:
Try different battery.
Try different kernel.
Click to expand...
Click to collapse
tried different Kernels.
So i may need to buy a new battery . Should i go for normal 1650mAh or more powerful 1800mAh? what you think?
I had the same problem and even worse,,, the phone got off after 2 minutes in any app and 15 minutes of call.
one more thing that i noticed is that my battery was a little swolen.
so i bought a new battery (1650 mAh) and everything was great again.
i don't belive that all those 1800 mAh will give you more "juice" then the 1650 mAh OEM.
What about
Genuine Samsung Extended Battery Kit for Galaxy S2 - 2000mAh - EB-K1A2EBEGSTD

[Q] SGS2 battery issues, I think? Please help.

Hey all, I'm a frequent noob to this site always asking for help because I always seem to mess up my phone in some way... So my phone was fine, then I started to notice the battery was always displaying the wrong charge. I would put the phone to charge and it would charge too 100% and when I disconnect it then it would display 60% or 90% that was just the beginning of my troubles. Now the phone sometimes has 30%+ more or less and the screen starts to flicker and lose lighting, then the phone gets really slow and ends up freezing. I go to turn my phone on and it doesn't even turn on... I leave it charging about an hour to see if that helps and when I turn it back on it says it is at 10% or so and then the same thing happens minuets later. Also at times it wouldn't even let me charge the phone it would say battery disconnected, this is the main reason why I did a fresh and clean install of a new ROM. I know it isn't my cable because I tried 4 different cables I have a few of my friends. I am running 4.1.2 with Siyah 6.0 I recent did a clean wipe of the phone to try to fix the issue and I had some issues with the new ROM. It kept saying com.android.phone has stopped blah blah blah so I downloaded a new ROM and it went fine I guess, then I uses Titanium Backup to restore all my apps and system data, then the com.android.phone message started popping up again... So I do a fresh clean install ONCE AGAIN and it works fine, I install just the apps+data no system data this time and it is still working fine. Also I moved all my apps to my SD card, when I reboot my phone it starts really slow and says loading instead of the name of the apps, also it takes about 5 minuets for the phone to work normally, at the start it is really slow and barely does anything, is that normal? I am using Lookout Security as my anti-virus. Also I use GO Launcher, is that fine or could that be an issue? ALSO I use ZDbox for an applock a cache cleaner and to kill tasks when I want to save battery life. I'm a real idiot when it comes to these things any help at all would be great, thanks.
P.S. As I am typing this my phone froze at 30% and when I reset it the number showed 14% and it has been charging ever since and is at 17% so the charging seems to be working fine for now, but not always and it loses battery life FAST, thanks for anyone who can help and give tips / answers.
Here are my phone details:
Model number
GT-I9100
Android version
4.1.2
Baseband version
I9100UHMS1
Kernel version
3.0.31 -Siyah-s2-v6.0b5+
[email protected] #177
SMP PREEMPT Mon Feb 18 16:38:28
PST 2013
Build number
JZO54K.I9100UHMS8
No need for your life story. Might be a battery issue, might be the USB port/board. Try one, then t'other.
I had exactly the same problem. Literally, exactly the same.
I bought a new battery. Problem solved.
Sent from my Nexus 7 using Tapatalk 4
For the battery issue, you can try to charge your phone completely when it reaches 15-20% (just think to shut it down before) to 100% (and let it charge 1 or 2 hours after 100%). Try this several times to recalibrate your battery. If it doesn't work I think you could buy a new battery.
How long have you got this battery? Just to let you know, a battery can be "dying" after roughly 500 charging.
Brahktor said:
For the battery issue, you can try to charge your phone completely when it reaches 15-20% (just think to shut it down before) to 100% (and let it charge 1 or 2 hours after 100%). Try this several times to recalibrate your battery. If it doesn't work I think you could buy a new battery.
How long have you got this battery? Just to let you know, a battery can be "dying" after roughly 500 charging.
Click to expand...
Click to collapse
I'm pretty sure it is the battery then because it is 2 years old LOL I have the same battery from when I bought it back in 2011, also I have 2 anker batteries which are a little over a year old so I'll buy a new one when I get a chance, probably a huge extended battery, I've always wanted one of those that last 3 days LOL thanks for the help guys.

is it possible to downgrade 4.3/4.1.2 and not having expected problems?

I have a quick question. Hope someone can help me. I have an international Samsung Galaxy S3.
I updated to 4.3 which was horrible. Battery would drain about 70% faster than before. Normally I would charge it during the evening to make the battery 100% and then disconnect from the charger before going to bed. During the day I use it as if it were a normal computer and listen to music about 4 hours a day but it would not go under 60-65% when I would charge again to get it up to 100% So I was very happy with my battery.
I wanted to downgrade and expected to lose Network, IMEI etc. again. (Last time coming from a custom rom it took me 5 days to fix this)
Everything went well, no problems and I am running 4.1.2 again but still my battery seems to be off. Checking FB, email and browsing a bit
and it goes from 100% to 85% And because I did not get the no network problem I wonder if the downgrade went well.
Is it possible to downgrade and even though everything looks fine. That there may be some files left from 4.3 that causes the battery problems and the no problems with network? I have done several factory resets and even let my phone run until it was completely empty and would not turn on. Then without turning it on I let it charge until the green light would come on but still the same battery problems.
Try using Battery Calibration from Play Store (requires root).
Other than that, I can suggest you use some apps to increase battery life, like Greenify (requires root).
Maybe try a different kernel and tweak it untill it provides what you want...

Battery gauge going nuts. :/

Hii!
My LG G2 mini D620r is 2 and a half years old, and most of that time everything was ok. But, since two months ago, I noticed that the battery is draining much faster than usual. And also discharge wasn't happening continuously, but it had sam jums i.e. I would use phone for some ammount of time, and the battery gauge would show decrease in capacity of only a couple of percents, and then suddenly it would drop couple of percents more for no reason. Also I noticed that phone wouldn't charge up to the max. It would show that it is 100% full, but after only couple of minutes of idling it would drop to 97%.
After all that I thought that there was a problem with the battery and bought a new one. But it din's solve the problem at all. Problem just continued to apper so I came to conclusion that there was no problem with a battery.
I read somewhere that Android battery gauge can go crazy after certain ammount of time, and my phone in quite old.
So my question is:
Does anyone know what is the solution to the aforementioned problem?
Does this problem have anything with battery gauge?
And if it does, can it be solved by reflashing the stock ROM?
I forgot to mention that I'm using stock Android Lollipop 5.0.2, software version V20b-EUR-xx. Phone is rooted.
kazamat said:
Hii!
My LG G2 mini D620r is 2 and a half years old, and most of that time everything was ok. But, since two months ago, I noticed that the battery is draining much faster than usual. And also discharge wasn't happening continuously, but it had sam jums i.e. I would use phone for some ammount of time, and the battery gauge would show decrease in capacity of only a couple of percents, and then suddenly it would drop couple of percents more for no reason. Also I noticed that phone wouldn't charge up to the max. It would show that it is 100% full, but after only couple of minutes of idling it would drop to 97%.
After all that I thought that there was a problem with the battery and bought a new one. But it din's solve the problem at all. Problem just continued to apper so I came to conclusion that there was no problem with a battery.
I read somewhere that Android battery gauge can go crazy after certain ammount of time, and my phone in quite old.
So my question is:
Does anyone know what is the solution to the aforementioned problem?
Does this problem have anything with battery gauge?
And if it does, can it be solved by reflashing the stock ROM?
I forgot to mention that I'm using stock Android Lollipop 5.0.2, software version V20b-EUR-xx. Phone is rooted.
Click to expand...
Click to collapse
A few options you can try, cuz i had the same problem on my d620r:
- Calibrate your battery;
- Uninstall/rootuninstall bloatware by LG/google, and apps you don't need;
- Use Facebook Lite;
- Use Greenify and Amplify (ideally with xposed framework);
- You can try reflashing stock after full wipe, but i dont think it will fix your problems;
- Best solution > Flash a custom rom and do all the things above.
I didn't have that problem on stock, but on CM13. I was running xposed framework with lots of modules, V4A in the background and a custom kernel, but still, i don't think that was the drainage problem. I'm still using the battery that came with the phone, and flashing Resurrection Remix Nougat 7.1 by mobiusm, governor on ondemand and greenify almost doubled my battery life since cm13!
kasa ssg said:
A few options you can try, cuz i had the same problem on my d620r:
- Calibrate your battery;
- Uninstall/rootuninstall bloatware by LG/google, and apps you don't need;
- Use Facebook Lite;
- Use Greenify and Amplify (ideally with xposed framework);
- You can try reflashing stock after full wipe, but i dont think it will fix your problems;
- Best solution > Flash a custom rom and do all the things above.
I didn't have that problem on stock, but on CM13. I was running xposed framework with lots of modules, V4A in the background and a custom kernel, but still, i don't think that was the drainage problem. I'm still using the battery that came with the phone, and flashing Resurrection Remix Nougat 7.1 by mobiusm, governor on ondemand and greenify almost doubled my battery life since cm13!
Click to expand...
Click to collapse
In september, I flashed CM 13 snapshot from august, and I noticed some bugs with it so I returned to stock Lollipop. I think that's when the problems started. Since then I have used Battery Calibration app (if you know some better apps of that kind please do recommend), installed Greenify, but not Amplify and removed some of the preinstalled LG/Google bloatware, but not all. I do not use Facebook app at all. After all that it came to my mind to do full phone wipe and maybe that would eliminate the problem.
kazamat said:
In september, I flashed CM 13 snapshot from august, and I noticed some bugs with it so I returned to stock Lollipop. I think that's when the problems started. Since then I have used Battery Calibration app (if you know some better apps of that kind please do recommend), installed Greenify, but not Amplify and removed some of the preinstalled LG/Google bloatware, but not all. I do not use Facebook app at all. After all that it came to my mind to do full phone wipe and maybe that would eliminate the problem.
Click to expand...
Click to collapse
I'd still recommend custom rom tho, preferably RR 7.1
And if you don't want a custom rom, make sure you are calibrating your battery correctly. By deleting the batterystats.bin file you dont really calibrate the battery, rather you reset the battery percentage meter. That is important of course, but before using the calibration app, make sure to do these steps:
Preparation: Hard reset the phone, root it again, install greenify (and amplify if you want), uninstall bloatware, charge to 100%. DON'T USE THE PHONE DURING THIS PROCESS FOR BEST RESULTS
1)Download Battery Waster and Battery Calibration from Play Store
2) Turn on battery waster (turn off flashlight option, it heats up the phone, turn on data, location and other battery consuming settings)
3)Drain battery to 0% until phone shuts down by itself.
4)When it shuts down, turn the phone back again for about 5 times
5)After those 5 or so times of turning on, put your phone on a charger without turning on (use wall charger if u can, and please use correct voltage of 5V)
6)When your phone shows full charge, unplug it and turn it on.
7)When you get to the homescreen, if you have less than 100% battery, plug in your charger again (without turning your phone off)
8)When it shows 100%, unplug your phone
9) Turn on battery waster
10) Let it turn off by itself
11) Do steps 4,5,6,7,8 again
12) Launch battery calibration app (root), and press calibrate
13) Restart phone
14) Greenify your apps and enable agressive doze in settings
NOTES: If on step 4 your phone sucessfully boots again without immediately shutting down, just continue draining your battery until it shuts down.
TIP: Keep between 40% and 80% battery
Hopefully your battery is like new again and free of its problems, but again flashing a custom rom other than fixing your battery, might even boost it, and custom kernels might boost it even more! (If configured right, that is).
IF YOU DECIDE TO FLASH A CUSTOM ROM, PLEASE DO THIS REGARDLESS
I hope I helped you!
Thank you very much @kasa ssg!
If this doesn't help, then there's no way to help me at all.
EDIT: Finally I found some time to do a recalibration of my phone's battery, and I think it worked. It definitely lasts longer now than before calibration. Also I returned to my phone's original battery that came with it first time it was bought.

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