Related
After flashing Odin several times (through trial and error) i noticed that my battery depletes or empties allot faster than before.
after doing some research it became apparent that the phone is not displaying the correct battery level. To solve this i had to wipe the battery stats after fully discharging and fully charging it to show the correct battery levels.
You can use any battery intensive applications to discharge the battery, after which you should fully charge it till you get a message telling you that the battery is full.
then run the following commands
su
rm /data/system/batterystats.bin
that should fix the incorrect battery meter although i wish we had a good custom recovery like HTC Other devices....
Enjoy
Hi i have also noticed yesterday that when my phone was charged to 100% i did not get the remove charger message. Could you please provide a step by step method to how you should go about correctly recalibrating the battery. This would be much appreciated. Thanks
n646464 said:
After flashing Odin several times (through trial and error) i noticed that my battery depletes or empties allot faster than before.
after doing some research it became apparent that the phone is not displaying the correct battery level. To solve this i had to wipe the battery stats after fully discharging and fully charging it to show the correct battery levels.
You can use any battery intensive applications to discharge the battery, after which you should fully charge it till you get a message telling you that the battery is full.
then run the following commands
su
rm /data/system/batterystats.bin
that should fix the incorrect battery meter although i wish we had a good custom recovery like HTC Other devices....
Enjoy
Click to expand...
Click to collapse
Sent from my GT-I9000 using XDA App
I did this hack today. Lets see how we get on
Its my 3rd recharge after flashing and i get opposite problem now. 27h since charging, with 3h display on and battery level is 100%
LOL
LOL the result was even easier than i thought.
I drained the battery down to 5%, plugged in the phone and can the command as in the first post. Turned the phone off than on again and when turned on instead of showing 4% (to be exact) it showed 23%. So i just gained 19% of my battery back. Woo
Is it necessary to totaly discharge the device till it turns off ?! So i did, then charged it to 100 % , turned the device on and immediately typed the command's into the shell, but nothing seemed to happen . Did i do anything wrong ?!
bratfink said:
Hi i have also noticed yesterday that when my phone was charged to 100% i did not get the remove charger message. Could you please provide a step by step method to how you should go about correctly recalibrating the battery. This would be much appreciated. Thanks
Click to expand...
Click to collapse
Ok so here is the instructions step by step
1) Charge the battery to full till you get the full battery message
2) Use the phone till it is totally empty (stops turning on)
3)Charge again to full till you get the message again
4) Download and install a terminal shell application from the market
5) Enter the following "su" press enter
6) Enter the following "rm /data/system/batterystats.bin" press enter
Best to Preform steps 4-6 while in charger
Enjoy
Thank you very very much
What is a good app to run to drain a battery quickly ?
Kilack said:
What is a good app to run to drain a battery quickly ?
Click to expand...
Click to collapse
There is an app forgot what it is called though. but it did not work i just turned on all the hardware that was faster
Last Question: When charging the device, should it be turned on or off ?!
TommyBeretta said:
Last Question: When charging the device, should it be turned on or off ?!
Click to expand...
Click to collapse
I did mine when it was on i do not believe there could be a difference
ok, thx again, i think it works now
Thanks for starting this topic . Because today I noticed that for hours after I unplugged it, it did not use any power on the battery graph. Aka, it looks like it thinks it's a lot fuller by default.
thanks for the info, but does it need to be rooted to complete these steps?
Waky said:
thanks for the info, but does it need to be rooted to complete these steps?
Click to expand...
Click to collapse
yes, rooted! only rooted u get access to this path.
Very anxious to try this! It really feels like my battery sucks balls!
Thanks for the tip
Edit: I just tried it, with my battery at 47% because I have no patience at all.. Nothing seems to have changed though, battery was still at 47%
n646464 said:
Ok so here is the instructions step by step
1) Charge the battery to full till you get the full battery message
2) Use the phone till it is totally empty (stops turning on)
3)Charge again to full till you get the message again
4) Download and install a terminal shell application from the market
5) Enter the following "su" press enter
6) Enter the following "rm /data/system/batterystats.bin" press enter
Best to Preform steps 4-6 while in charger
Enjoy
Click to expand...
Click to collapse
Do you have to root the phone to install a terminal shell? thanks.
omzart said:
Do you have to root the phone to install a terminal shell? thanks.
Click to expand...
Click to collapse
I don't think that you need to be root to install the terminal application, however, i do think that without root you cannot run the "su" - super user command.
I could be wrong however.
Edit:
Ok, i just rooted my phone, it's actualy much safer than i thought. The "Superuser permission" application actually alerts you so that you decide whether you'll grant super user permissions to application. If i knew that i would have rooted my phone earlier Yay
For this very purpose i installed Terminal emulator and after typing "su" the "Superuser permission" application actually alerts you if you want to grant terminal super user rights.
I was just testing this, i need to empty my battery first and then charge it full, then i'll try to delete the above mentioned file.
Ok and wich terminal shell is the best on the market?
I'm within my 30days
I love this phone.
My battery discharges rapidly, especially their the first 5 mins off the charger.
I have been looking at this issue, but I am new to android.
I find it funny we can't actually see a battery percentage without installing third party apps. Then Sprint tries to say that these apps are the cause of the issue.
Trust me, I understand that this phone will drain the battery more rapidly than a lot of other phones. But there is something wrong with the way this phone charges the battery, therefore we see less battery life.
Can anyone prove or disprove their little claim that I am killing the battery by looking at its performance?
Sent from my PC36100 using XDA App
tell him that the phone and the plan is also draining your wallet, may be you should do something about that too
the reason your battery sometimes drops so quickly after you take it off the charger has been well documented. several threads with ways to improve the battery as well.
it has to do with the way the battery actually charges. it charges to 100% then allows the phone to discharge to 90% then charges up again...so at any time when you unplug the phone you may have 91% to 100% charge. or something like that.
1) have you tried conditioning your battery? (plug, wait, unplug, rinse repeat)
2) are you rooted? (try using something like SetCPU or JuiceDefender)
3) are you on stock or custom rom? (the custom kernel devs have been working on this issue)
hmmmm...how could you possibly disprove the sprint person? try not using it for a couple days...see what happens.
DraginMagik said:
try not using it for a couple days...see what happens.
Click to expand...
Click to collapse
No doubt....my withdrawals kick in after its been in my pocket for too long...
While do appreciate the input, I disagree with it being well documented. I have tried both top off methods, aka conditioning, and it seems to give you more of a charge, but as soon as discharge the battery you are right back where you started, conditioning the battery every morning is not ideal.
Sent from my PC36100 using XDA App
If the phone is new, its going to take a few cycles to improve. I remember when in my first week it wouldn't last a day. Now I can get 20-30 hours out of it. (ROMs and tweaking of course.)
There are tons of threads detailing what you can do to improve battery life... What have you done?
The purpose of a battery graph is to compare how your phone discharges to how your phone is being used. What plotting app do you have?
engagedtosmile said:
If the phone is new, its going to take a few cycles to improve. I remember when in my first week it wouldn't last a day. Now I can get 20-30 hours out of it. (ROMs and tweaking of course.)
Click to expand...
Click to collapse
This is false...lithium batteries do not get broken in or conditioned. What you saw is more than likely a result of constant using your new toy. The novelty has worn off and you have tweaked it so now you have extended the battery life.
I have disabled Bluetooth, WiFi, gps, and 4g
I set the radio to cdma only, and this led to problems. So I cleared all data And started over.
Are youguys seriously ok with 'conditioning' your batteries every morning?
Sometimes I think people think I'm just trying to find faults with this device. I want to keep the phone, but I also want this problem clearly identified and resolved. I should not have to use my tilt 2 to charge my battery because my new state of the art phone can't do it correctly.
Sent from my PC36100 using XDA App
lettcco said:
tell him that the phone and the plan is also draining your wallet, may be you should do something about that too
Click to expand...
Click to collapse
it's called the Fat Wallet Mod Discussed in other threads also,
But yes, I think it's dumb to have to condition the phone to get the best battery life, and how I have to get soo much good Light to take a good camera shot when other comparable phones don't need too. You have to weigh the goods and bad yourself.
The discharging of the battery is necessary as trickle charging a lithium battery is not recommended...thus this leads to you possibly having 95% instead of the full 100%. This is normal. Just unplug the device and charge again, or top it of in the car.
You never mentioned if you were rooted or not. If you don't use the news then don't sync it. If you don't use gtalk then disable it and turn off the auto sign in...i found that this app uses a lot of battery and its turned on by default.
It is not conditioning your battery.
When you charge your new evo and it hits 100%, the phone STOPS charging. It has no trickle charge. It begins charging again at 90% if still plugged in, although it reads 100% until it comes off the charger.
SO, when you unplug it, it says 100%, but could be anywhere between 90 and 100. If you simply unplug your phone, wait for it to display something other than fully charged (usually takes 30-60 seconds), then plug it back in, it will then charge back to 100%. You can simply unplug it, wait a few and then plug it back in while you go about your shower and cereal. When you are ready to leave the house you'll probably be at or near 100% instead of seeing it drop to something much lower.
This is NOT conditioning your battery. A more appropriate term would be "bump charging". As you are simply bumping it back to a charge state when it was in a resting state.
Another GREAT method of increasing battery life is resetting your battery stats. This is clearing out what the phone defines as full, and as empty and setting up these values again. I am not sure why, but they are off on many phones. They also get wiped anytime you flash a new rom so this procedure would again be in order if you experience poor battery life.
These are the instructions straight off cyanogen wiki. You can also reset them using Amon recovery.
Battery recalibration
If you're experiencing higher than normal battery drain, try the following:
1.Charge the phone to full battery; let it keep charging until the battery says it is fully charged. Do not just wait until the light is green, it isn't always fully charged, causing a lot of inaccuracies. (You can check by going to: Settings -> About Phone -> Status -> Battery Level = Full.)
2.Boot to recovery mode and go to console (or adb shell) and type:
mount -a
rm /data/system/batterystats.bin
NOTE: Newer Amon_Ra and ClockworkMod recoveries have an option to delete the battery stats, do this in place of the console commands above.
NOTE: To have the most accurate of battery stats, reboot the phone immediately after wiping the battery stats and wait for CM to boot completely to the desktop. Once your entire boot is done and you have full access to the phone, go ahead and pull the charger and continue with this troubleshooter.
1.Do not charge the phone until after draining the battery completely, resulting in it automatically shutting off.
2.Recharge the phone completely and then use as you normally would.
Excellent write up carguy... +15 internets to you
surrealmethod said:
Excellent write up carguy... +15 internets to you
Click to expand...
Click to collapse
why thank you kind sir!
potna said:
I'm within my 30days
I love this phone.
My battery discharges rapidly, especially their the first 5 mins off the charger.
I have been looking at this issue, but I am new to android.
I find it funny we can't actually see a battery percentage without installing third party apps. Then Sprint tries to say that these apps are the cause of the issue.
Trust me, I understand that this phone will drain the battery more rapidly than a lot of other phones. But there is something wrong with the way this phone charges the battery, therefore we see less battery life.
Can anyone prove or disprove their little claim that I am killing the battery by looking at its performance?
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
sprint rep is an idiot and if you took the time to search instead of making this post you could have saved yourself some trouble
no...i can't imagine anyone 'conditions' their battery daily. however, if experiencing issues wiping the stats and doing the conditioning thing do have an impact.
Sporkman said:
sprint rep is an idiot and if you took the time to search instead of making this post you could have saved yourself some trouble
Click to expand...
Click to collapse
While most of the battery problem isn't the plotter app, the plotter app is using a fair amount of battery, so I usually would recommend not having such apps running except when you are diagnosing problems. Turn off various apps sync settings and keep background apps to a minimum, like juice plotter, battery widgets, and other data intensive apps and widgets. That right there will save you some power. Other than that, follow all the excellent suggestions that are already in this thread. Oh, and I find I get better battery when I just don't worry about it. I set up all my sync services and then leave them alone. Then just go about my day, using my phone as needed. Constantly worrying about it only wastes power because you are constantly fiddling with settings and apps.
PROTIP: Never believe anything a cellular rep tells you. Ever. EVER!
The Evo just has terrible battery life, that's my personal conclusion. One of the trade offs with such a huge screen and such. You'd think that in this day and age battery technology would have kept up with all the other bells and whistles, but no.
carguy4471 said:
It is not conditioning your battery.
When you charge your new evo and it hits 100%, the phone STOPS charging. It has no trickle charge. It begins charging again at 90% if still plugged in, although it reads 100% until it comes off the charger.
SO, when you unplug it, it says 100%, but could be anywhere between 90 and 100. If you simply unplug your phone, wait for it to display something other than fully charged (usually takes 30-60 seconds), then plug it back in, it will then charge back to 100%. You can simply unplug it, wait a few and then plug it back in while you go about your shower and cereal. When you are ready to leave the house you'll probably be at or near 100% instead of seeing it drop to something much lower.
This is NOT conditioning your battery. A more appropriate term would be "bump charging". As you are simply bumping it back to a charge state when it was in a resting state.
Another GREAT method of increasing battery life is resetting your battery stats. This is clearing out what the phone defines as full, and as empty and setting up these values again. I am not sure why, but they are off on many phones. They also get wiped anytime you flash a new rom so this procedure would again be in order if you experience poor battery life.
These are the instructions straight off cyanogen wiki. You can also reset them using Amon recovery.
Battery recalibration
If you're experiencing higher than normal battery drain, try the following:
1.Charge the phone to full battery; let it keep charging until the battery says it is fully charged. Do not just wait until the light is green, it isn't always fully charged, causing a lot of inaccuracies. (You can check by going to: Settings -> About Phone -> Status -> Battery Level = Full.)
2.Boot to recovery mode and go to console (or adb shell) and type:
mount -a
rm /data/system/batterystats.bin
NOTE: Newer Amon_Ra and ClockworkMod recoveries have an option to delete the battery stats, do this in place of the console commands above.
NOTE: To have the most accurate of battery stats, reboot the phone immediately after wiping the battery stats and wait for CM to boot completely to the desktop. Once your entire boot is done and you have full access to the phone, go ahead and pull the charger and continue with this troubleshooter.
1.Do not charge the phone until after draining the battery completely, resulting in it automatically shutting off.
2.Recharge the phone completely and then use as you normally would.
Click to expand...
Click to collapse
I'm sorry but that all sounds like the formula to derive the circumference of the nucleus of an atomic variable perpendicular to the perimeter of the nth root in relation to the isosceles of the .........geezus, all that just to get a smidgen of decent battery life...
coming form other android phones, ive learned to wipe batt stats in recovery to get the best life.
normaly i wind up seeing voltage @ 100% a little over 4.260v
now on our phones we dont have that option, and i noticed while trying out diferent roms that its hitting " 100% " at various voltages depending on what the batt truely was when flashing.
if i recall the file is : /data/system/batterystats.bin that we need to delete? corect?
well, before i did it, it hit 100% @ 3.782v and wouldnt go any higher...
now, im sitting @4.246... im not 100% sure its fully charged. ill let it sit overnight turned off and see where i wind up.
UPDATE 11-20
SO, voltages have been confirmed.
100% = 4.20-4.25 depending on battery condition
0%= dependent on the kernel generaly 3.2-3.0 {found some as high as 3.7v!} thank you to hastarin for pointing the files out
if your not seeing 4.2v your not getting full battery life.
sure enough, i was sitting just shy of 4.3v this am after an overnight charge with the phone turned off...
Interesting info, but where would you find out the voltage the battery is producing?
so, how to wipe the battery stats?
time to get down and dirty and learn to navigate thru the android OS.
download and set up the android SDK
http://developer.android.com/sdk/index.html
heres a newbie guide to adb in the nexus forum
http://forum.xda-developers.com/showthread.php?t=619153
for those less computer literate, you can use droid explorer to do alot of the stuff thru a GUI. it also will set up adb for you.
http://de.codeplex.com/
the code that you type in to remove the battery stats is
Code:
rm data/system/batterystats.bin
now to properly condition the battery.
turn off the phone, plug it in, preferably overnight.
boot the phone up while still pluged in.
delete the batterystats.bin file ether thru adb or terminal
drain the battery fully, untill it powers down. wait a min or two and reboot it to completely drain it.
congrats... your phone now knows corect voltage values for 100% and dead.
Remember: Flashing a new Android build erases the battery stats, and automaticly rebuilds them based on voltages it see's .
ie: you need to recondition after each flash to get max battery life.
i use the "battery life" widget by curvefish to show me temp, voltage etc.
Slampisko said:
Interesting info, but where would you find out the voltage the battery is producing?
Click to expand...
Click to collapse
some builds will show actual voltage under menu/about phone/battery use
otherwise i use the " battery life" widget by curvefish, available for free from the market. once you add it to the screen, tap it, hit settings, then check both charging info and extended info.
after conditioning the battery, im currently @27 hours since unplugging, gps, and wifi turned on the entire time, im @ 3.873v or 61%! granted, its been light usage its my secondary phone right now, but i am on the outskirts of service, and the week signal usualy sucks the battery...
ill update again , probably this time tomorow once it finaly dies...
just a little food for thought: its been over 27 hours since i unpluged, and my voltage is still higher than what the phone assumed was 100% @ the time of the initial flash....
@ 50 hours (still 10%) i finaly got sick of waiting for it to die. i turned screen on full bright, and ran gps test and locked the screen on. phone finaly died @ 2.988v im now charging it again with the phone turned off.
Umm why do we need this though ?
Wont the phone keep running as long as there is sufficient voltage in the battery ?
What is the use of this method ?
This is for people who have found a build they are happy with and want to use for a while so that their battery lasts longer, much longer. As the OP has posted, his phone is currently lasting about as long as it does in WinMo which is an impressive feat, more so being as he's running his GPS non-stop at the same time.
I for one am going to do this myself when I get the time. If I knew whether my alarm would go off while the phone was switched off (for the overnight charge) I'd do it tonight but cannot risk being late for work tomorrow lol
Thanks Reno but I meant HOW does it work ?
I thought this method just helps you see your battery's percentage .. Wont the battery run no matter what the percentage show as long as the battery has a charge ?
Can someone please explain this ?
Yeah I cant afford not waking up late as well, so im charging it while its on, would that affect anything ?
It will still charge up the battery wouldnt it ?
as stated in the op.... when you flash a build, android assumes whatever that voltage is =100% so if you realy only have 50% (about 3.7v) thats all it will charge to...
100% is realy 4.2v , this recalibrates it to alow it to fully charge.
do they not teach reading comprehension now a days? its not just this thread... its the whole forum!
Oh ok thanks ! Makes sense ..
Well I charged my phone during the night while it was switched on, in the morning the battery stated it has 4.212mV
Do I need to recalibrate it ?
recalibrating cant hurt.
For those of you who are using droidexplorer.... when right clicking on batterystats.bin and selecting delete the file does not disappear... is this how its suppose to be? If that is not suppose to happen then where exactly do you type "rm data/system/batterystats.bin"
in the console
for what its worth: Li-Io battery technology realy isnt different whether it be a phone, rc car, etc...
our batterys are a single cell. ie: rated 3.7v
4.2-4.25v is concidered by the industry as fully charged
3.7v is nominal voltage
3.2v "shorted" voltage : ie: voltage sag due to max discharge @nominal voltage
3.0v discharged
2.5v protection circuitry kicks in.
this jives with what i am now seeing on my phone after wipeing stats and calibrating...
it is also a industry standard to fully discharge ( 3.0v )about every 30 discharge cycles.
people please post what you are seeing for voltages 100/0 % before complaining about battery life.
ducvader said:
For those of you who are using droidexplorer.... when right clicking on batterystats.bin and selecting delete the file does not disappear... is this how its suppose to be? If that is not suppose to happen then where exactly do you type "rm data/system/batterystats.bin"
Click to expand...
Click to collapse
So this ^^^^ is the adb command?
Then I would type in
adb devices
rm data/system/batterystats.bin
Is this right,or is there any other commands I need after I put in adb devices?
very interesting
maybe i should try it..
4.2v @100%
This is just a quick question from a bit of logical thinking really...
Once we've got a properly calibrated Batterystats.bin file, can we back that up and use it with other builds?
Can we also therefore share it with other peoples phones as well?
Hi,
I've recently replaced my battery and now it is not charging fully to 100% but only to 85%. Sometimes it displays it is fully charged but after a minute the percentage dropped to 85%. I've already tried multiple chargers with no result. The only thing that works is bump charging. It looks like the battery is just working fine but the displayed percentage is not right. Is there a way to 'reset' this statistic? Removing the battery.bin didn't do anything for me.
Is there a way to check if the battery is really fully charged despite the wrong displayed percentage?
Faeshaas said:
Hi,
I've recently replaced my battery and now it is not charging fully to 100% but only to 85%. Sometimes it displays it is fully charged but after a minute the percentage dropped to 85%. I've already tried multiple chargers with no result. The only thing that works is bump charging. It looks like the battery is just working fine but the displayed percentage is not right. Is there a way to 'reset' this statistic? Removing the battery.bin didn't do anything for me.
Is there a way to check if the battery is really fully charged despite the wrong displayed percentage?
Click to expand...
Click to collapse
To fix what you are doing you have to be rooted.
1. Root your n4
2. Download root browser from playstore
3. Go to data/system directory and delete batterystats.bin
4. Accept superuser access
5. Reboot and let the battery drain till 0%
Anyway, I don't know if it will be a battery calibration issue, because if u had to replace your previous battery maybe your phone doesn't manage battery well and destroy them... Try, report, and we will make conclusions
luiseteyo said:
To fix what you are doing you have to be rooted.
1. Root your n4
2. Download root browser from playstore
3. Go to data/system directory and delete batterystats.bin
4. Accept superuser access
5. Reboot and let the battery drain till 0%
Anyway, I don't know if it will be a battery calibration issue, because if u had to replace your previous battery maybe your phone doesn't manage battery well and destroy them... Try, report, and we will make conclusions
Click to expand...
Click to collapse
I just deleted it, it's worth a try!
The weird thing is bump charging will result in a 100% charge and the battery seems to work normally (20hours of battery time with normal use).
luiseteyo said:
To fix what you are doing you have to be rooted.
1. Root your n4
2. Download root browser from playstore
3. Go to data/system directory and delete batterystats.bin
4. Accept superuser access
5. Reboot and let the battery drain till 0%
Anyway, I don't know if it will be a battery calibration issue, because if u had to replace your previous battery maybe your phone doesn't manage battery well and destroy them... Try, report, and we will make conclusions
Click to expand...
Click to collapse
It will be a battery calibration issue since that file only stores the statistics of apps. It gets deleted upon reboot. So this won't affect the measurements in any way.
Sent from my Nexus 4 using Tapatalk
Faeshaas said:
Hi,
I've recently replaced my battery and now it is not charging fully to 100% but only to 85%. Sometimes it displays it is fully charged but after a minute the percentage dropped to 85%. I've already tried multiple chargers with no result. The only thing that works is bump charging. It looks like the battery is just working fine but the displayed percentage is not right. Is there a way to 'reset' this statistic? Removing the battery.bin didn't do anything for me.
Is there a way to check if the battery is really fully charged despite the wrong displayed percentage?
Click to expand...
Click to collapse
Connect the charger to the Nexus 4, then insert the plug.
Press the power button and hold it until the device turns on. Immediately after this, press and hold the Volume Down key, not releasing the power button. Appears on the screen Start, circled arrow.
Pressing the Volume Down key, select Power off and activate it by pressing the power button.
When the phone is turned off, unplug the charger and plug it in again. then turn on the phone.
Both solutions didn't work for me. Is there a way to confirm that even if Android displays a value of 85% the battery is fully charged? Because I don't care that much wrong percentage is displayed, I just wanna know for sure the battery is ok.
Faeshaas said:
Both solutions didn't work for me. Is there a way to confirm that even if Android displays a value of 85% the battery is fully charged? Because I don't care that much wrong percentage is displayed, I just wanna know for sure the battery is ok.
Click to expand...
Click to collapse
you should try reflashing your rom
Wipe cache, dalvik cache and battery stats in recovery then fix permissions and reboot.
Puneet Singh Chauhan said:
Wipe cache, dalvik cache and battery stats in recovery then fix permissions and reboot.
Click to expand...
Click to collapse
As I already said in the 3rd post here. That is absolutely useless.
Sent from my Nexus 4 using Tapatalk
luiseteyo said:
To fix what you are doing you have to be rooted.
1. Root your n4
2. Download root browser from playstore
3. Go to data/system directory and delete batterystats.bin
4. Accept superuser access
5. Reboot and let the battery drain till 0%
Anyway, I don't know if it will be a battery calibration issue, because if u had to replace your previous battery maybe your phone doesn't manage battery well and destroy them... Try, report, and we will make conclusions
Click to expand...
Click to collapse
Or restart your phone and battery stats will reset.
Some say battery calibration is a myth, I'm quite sure it works!
You can give that a try after flashing a new rom to improve your battery life! :victory:
(the guide is tested but still i'm not responsible for any demage to your phone)
1. you need a recovery to access a specific file
twrp works
2. you need the xposed app: disable low battery warning (or a likely name)
(for that you can fully dischage your phone)
3. you need a battery discharger app this one: Fast discharge
(for that you can faster discharge)
4. you activate the xposed app and discharge your battery with the app (set the app to discharge to 0%)
(i wouldn't activate the light or the vibration since i don't know if they can overheat for discharging the battery)
5. set the governor to performance to have a faster discharge
6. your phone will kind of be fully discharged and just turn off at maybe 5% battery or later
7. charge your phone just plug it in until it's 100%
(i couldn't boot like that to the system so i had to reconnect after 100% charging which isn't the right way to calibrate battery)
(so if you can then boot whilst charging or plug back in after booting on 100% quickly)
8. enter the recovery and search for this file:
> /data/system/ batterystats.bin
then reboot
thats all!
More info about the myth here. I only calibrate my bat when I feel it needs to be calibrated, even being a myth:laugh:
P.S: or you can download a battery calibration app from Playstore.
The myth of "calibrating the battery makes it last longer" was dispelled by Google's own engineers. All calibrating the battery does is wipe the battery statistics file that keeps the usage history you see in settings. This is something that happens when the device nears 100% charge anyway so its pretty much useless to do it.
As for "the right" way to calibrate the battery, the OP clearly has no idea what he's talking about... its the battery usage history file, there are 2 ways to delete it - manually or just charge the battery to 100%, neither of those does any harm to the device and neither is better than the other seeing as this whole thing of calibrating the battery is utter nonsense.
To which end I don't really see a reason or need for this thread.