Battery gauge going nuts. :/ - LG G2 Mini

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.

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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!

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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.

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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!

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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.