yashsingh1/xdaforums huggingface dataset:
[Galaxy S II General] jbarol:
just did it after first time turning on the phone. first i discharged it completely, then charged it to 100%. as soon as it beeped i unplugged it and pulled out the battery. waited about 30 minutes and put it back in. Said 98% charge -_-

1 hr later, 94%

how can i find out the voltage? i am using settings>about>status to check the %
[Galaxy S II General] Snakeforhire:
that's got nothing to do with the GS2 specifically, it's an issue that plagues most phones, even "dumb" ones..

Actually before you start your calibration, you have to do a little bit of what's called "bump-charging" (learned that back when I had a Wave 1) : charge it once to 100% and unplug it.

you'll notice that it drops to 95/96% almost right away, and if it doesn't, it falls down to 99% pretty quickly anyway.

Wait for about 30s before replugging it in and wait to get to full charge again, then unplug. See if it stays at 100% or drops again : if it drops again, redo the cycle until the device displays 100% for at least 5mins (it can take up to 20-25 tries if you've never done it before on your battery and device has been running a long time on it), then you can charge to 100% again and *finally* start calibrating...

Personally I never bother doing that, neither calibrating..

For one thing, because Li-ion batteries are said to not much like being fully charged/overcharged (=staying connected to a wall socket for more than a night ), second because I have 4 batteries (all different in mA/h rating) that I cycle regularly, so I'd have to do it every time I put another battery in (or not forget to switch the profile in Battery Spy, which I always forget anyway), and lastly because it's too much of a pain and waste of time.. xD
[Galaxy S II General] TechWizard:
Regarding step 9???

What do I say to the battery god? Will ''help battery god dude'' be ok? :confused:
[Galaxy S II General] Snakeforhire:
I'd really avoid this if I was you.. I *unvoluntarily* did that on one of my stock batteries lately (was fiddling with the settings in bed, flashing the new version of Siyah kernel, and fell asleep on the phone without having plugged it in the wall socket before :S)..

And of course, come morning the phone was flat out of battery (turns out the 2.2+ Siyah series have a wicked problem which makes the media scanner loop around if you have too many small files (webpages, pics, etc) on your SDcard -and my 32Gb card holds ten tons of those.. That's what makes the phone heat up so much when you're using this kernel lately. So that damned media scanner looped around all night, sucking all the power that was left in the battery... But the phone was still warm when I woke up, so it must've been damned close, I must've missed the crucial point by less than 15mins I guess). :/

Anyway, I recharged the flat battery to about 10% (you should never leave a Li-ion fully discharged, that's also a very bad idea) before I switched and put a full one in to boot up the device and check if everything was still alright, and didn't give it much thought anymore.

But the next time I used the battery with which this happened, it gave me the impression to take about 1 1/2 times the time it needed to fully charge before the incident, and it lasts for 20-25% less time now.

A bit of research on the web quickly found the info I gave above, namely that a battery like ours should *never* be totally discharged (below 1%) voluntarily, because if the internal circuitry has to kick in and shutdown before it's actually all flat, it takes away a good chunk of the charge capacity anyway.. :(

since many people on this thread seem to be french like me.you can check this out for more info

http://m.tomshardware.fr/tests/Li-ion-batterie-conservation-entretiens-fabrication-22678

EDIT : crap, link seems to be down.. Oh well, check out http://forum.hardware.fr/hfr/Ordina...utilisation-batteries-bonne-sujet_18573_1.htm instead, or google it using the words in the title of the page, it spits out plenty of relevant results ;)

---------- Post added at 01:52 AM ---------- Previous post was at 01:51 AM ----------

yup, reckon so.. something like that anyway.

It probably wouldn't hurt to sacrifice an iPhone4S at his altar too, to quench his wrath.. xD
[Galaxy S II General] mikel719:
I just did this. Will post my results.

Sent from my epic touch B=====D {()} (o)(o)
[Galaxy S II General] ram3n:
For sure, and don't forget also to say "long life to Sammy" to the Samsung god :D
[Galaxy S II General] ajgarciam:
Thanks you for all.
[Galaxy S II General] baekwondo:
I tried this,

but my battery dropped to 98% (from fully charged) right after i opened the phone.

Is this normal?

using KF1 Stock rom 2.3.3
[Galaxy S II General] grgsiocl:
I followed this procedure for a month now. After switching on (I mean after completing the procedure), why the battery capacity (4191 or 4192mv) shows lesser than that like 4132mv even at 100%. That means battery is not fully calibrated or battery is not charged to its full capacity?
[Galaxy S II General] zaint:
Thank you man.:eek:
[Galaxy S II General] Pfeffernuss:
Why the f*** should it mess up anything? It's an app to display some stats, nothing more.

However I wouldn't run the app between 1 and 4 PM, that is some very dangerous practice. Did it once and it required me to buy a new battery :(
[Galaxy S II General] PetoG:
10. ... and voilà ! .... >>> 100% !!! Seems OK. I will test it tomorrow.

I hope the battery percentage will be the same after some soft resets (as it was before my problem..)
[Galaxy S II General] ram3n:
No problem so far with mine.

I suggest you to do a full cycle discharge to complete the process.

Cheers :D

Sent from my little monster GS2
[Galaxy S II General] PetoG:
discharge to about 1-5%?
[Galaxy S II General] ram3n:
Yes, this is a good approximation.

Sent from my little monster GS2
[Galaxy S II General] Thank Me Later:
So after following your steps just use the phone until it gets low to about 1-5% and then charge it up to full? Don't let it discharge until the phone turns off? I just wanna make sure I follow the steps that'll work properly.
[Galaxy S II General] ram3n:
I personally let it discharge to 5 %.

"full discharging " will one day kill all Lion batteries , so be careful dude!

Sent from my little monster GS2
[Galaxy S II General] Snakeforhire:
That's the kind of detail I'd take care to mention right away, in the first post.. Not after there's been like 30 comments and it gets drowned in the flood.. ^^

"C.Y.A.", dude : always "cover your ass", and avoid unnecessary lawsuits (or needless blame, that's also a major inconvenience I think).. ;)
[Galaxy S II General] Thank Me Later:
Good looking out bro!
[Galaxy S II General] PetoG:
for me it works!! thank you ram3n :)

only for my information, why it must be charged to the full and phone must be swithed off during this?
[Galaxy S II General] ram3n:
You're welcome dude !

Because, when you're phone's on, charging becomes just less effective and even slower...
[Galaxy S II General] ingbrzy:
great..! works for me too...
[Galaxy S II General] bobster0001:
What do you do with the phone when it is discharging? Use it like usual or leave it alone?
[Galaxy S II General] ram3n:
I would say use it as usual and just enjoy your phone :)

Sent from my little monster GS2
[Galaxy S II General] Barretje:
Helpfull, thanks!
[Galaxy S II General] Thank Me Later:
I've been using this method for a minute and it seems to work well after flashing a rom. Great stuff!! I have great battery life on the rom I am running right now.
[Galaxy S II General] bobster0001:
What happens if your phone reboot or force shutdown when it is discharging? Does it affect the results? And do I charge it while it is off or on after the discharge?
[Galaxy S II General] ram3n:
No matters. Just charge with phone off. Then pull out the battery

Sent from my little monster GS2
[Galaxy S II General] bobster0001:
I meant after that. when the battery reach 5% from the first cycle, do I turn it off again and charge it or charge it when the phone is on? Or doesn't matter? Thanks for your help.
[Galaxy S II General] ram3n:
IMO, it is better to leave phone off while charging.

Sent from my little monster GS2
[Galaxy S II General] xfiles.:
I'll try this
[Galaxy S II General] yacbos:
I did everything u can imagine and the max battery achieved was 4193 mv how did u reach 4200??

Brand new sgsii syock battery stock rom android 2.3.5 and rooted
[Galaxy S II General] ram3n:
Nothing's wrong , It may depends on how you've charged your phone.

Just try again, follow all the steps, it would be alright :D
[Galaxy S II General] PetoG:
Hi All,

after week and a half I have the same problem. After full charging I have again 97%.....

P
[Galaxy S II General] hong1314:
thanks for the post... appreciate a lot and help me to use up more battery~
[Galaxy S II General] Mone181:
oh great..i'll try thank you
[Galaxy S II General] mizuki555:
I'll tested too

Thanks

Same if the battery works well (i think lol)
[Galaxy S II General] s2dh:
After doing this, my date/time reset then I rebooted twice and then entered the correct date and time again, by the time I had spotted flaffing around my battery was

down to 90%...

(not good)

so will test this again when the battery next gets to 100%.

*edit*

After the battery charged to 100% I did the steps listed in the first post and again date/time reset - do I entered the correct date/time again and will monitor my battery stats..

But in the last 8 minutes it has dropped by 3%.
[Galaxy S II General] JJEgan:
Think on this .

Follow OP instructions re calibrate battery should not battery then be 100% and charge no more .

But if you connect charging cable after carrying out instructions it will continue to charge again .

The fact is that SGS2 has never needed battery recalibrated after a rom flash just wait a few cycles and it will have recalibrated itself . All the wipe battery stats was for was if battery stats are wrong after a flash .

However it is a convenient reply to noobs that have flashed a new rom and got bad battery Have You Wiped Your Battery Stats ..

SGS battery excellently summed up here .

http://xdaforums.com/showpost.php?p=18677485&postcount=31

jje
[Galaxy S II General] Pete71:
I'm sure it was just a coincidence, but immediately after doing the above method, my phone lost it's IMEI number, and I had to spend all day trying to recover it !!
[Galaxy S II General] Livespiritster:
yeah why not :)
[Galaxy S II General] ram3n:
For sure, pure coïncidence...

It has nothing to do with IMEI number.

BTW : Happy New year guys! :D

Sent from my little monster GS2
[Galaxy S II General] jxb25:
No matter what I do I followed everything to a T. I let it drain to 5% cut my phone charged it up and I went on my way came back it was fully charged unplugged it took the battery out let sit for 90 secs put the battery back it and when it cut on my battery was at 99%

Sent from my mistress
[Galaxy S II General] arj154:
I've just loaded a new kernel and it seems like my battery has been rising without being charged :S I'm guessing it miscalculated the remaining battery but does it need recalibrating? Or does it just need time to calibrate itself?
[Galaxy S II General] ram3n:
I see your problem.

Don't be afraid, you can safely calibrate your battery with my method. It will solve your issue. :D
[Galaxy S II General] arj154:
hopefully so, this is what happened last time :S that random spike downwards was when it restarted, it went from 20 to 8 and then rose to 16 i think :S
[Galaxy S II General] shumo:
hello

first, thank you for a helpful thread

second , i know that battery calibration is recommended after flashing a new firmware ... but recently i was forced to do a factory reset ( hard reset , not flash a new rom ) so i was wondering if it's necessary to do it again now after this
[Galaxy S II General] Lownita:
Can this also be done at let's say 60% battery? Like: Turn off, pull out battery for a couple minutes, put back in, reload to full, turn on?
[Galaxy S II General] ram3n:
Yes, you can sir :D

Don't forget to do some cycle of charge and discharge then.

Cheers
[Galaxy S II General] jcst83:
Ok, now i briefly explain my understanding of this calibration....

"1: Turn off the device (doesn't need to be totally blank out your battery. 5-10% left should be fine)

2: Fully charge the device (doesn't need to be exact 100%.....99% should be fine.. otherwise, you have to unplug your charger within 1.25 sec once your device hit 100%)

3: Pull off the battery and leave it more than 90 sec...

4: Put the battery back and boot up the device...

now got 2 option

option1: If your battery not at 100%, plug in the charger to fully charge it to 100%. Again, once fully charge (not more than 1.25sec)>plug out the charger>turn off the device>take out the battery>wait for 90sec> put it back>turn on the device. if it still not 100%, can doing it again and again for 20-25 loops until it hit 100% when turn on...

option2: If your battery already at 100% when boot up, discharge it around 5%(95% left). Then doing the same thing as option1.. do this 1-2 times should b fine....."

correct me if i'm wrong....:o
[Galaxy S II General] shumo:
i have a question please

why is it so important that i unplug the charger in maximum 1.25 seconds ?

i mean , what happens if i unplug it 1 minute after the phone says 100% charged ( i am refering to the part where i fully charge the phone in offline mode before i take out the battery )

is there any particular reason ? and it is a problem if i unplug it like i said in 1 minute or so ?

thanks
[Galaxy S II General] ram3n:
There is actually no danger. But this will just be less accurate, if you leave your phone plugged too long time after reaching 100%.

That's all :D
[Galaxy S II General] Axens:
thanks you
[Galaxy S II General] ram3n:
Thanks for Thanks me :D

You re welcome

Sent from my little monster GS2
[Galaxy S II General] Axens:
My English are not very good, your method are exelente! I'm on Miui, and nothing worked , 10% per hour, and! beautiful 1% per hour in deep sleep, reduced power consumption in operation, Hat gentlemen !! thank you!
[Galaxy S II General] Pfeffernuss:
Care to elaborate?
[Galaxy S II General] JJEgan:
Dont see this as true at all .

Leave on 100% and it stops charging .

Bump charge at 100% and it will continue charging ..

While i agree with wiping battery stats if you want to clear readings for battery investigation and also charging to 100% .

I see nothing but smoke and mirrors in the rest of the nonsense of 1.25 seconds 90 seconds etc .No actual evidence that either of those two figures give better calibration .

Rule is charge it use it forget calibration full stop.

jje
[Galaxy S II General] Pfeffernuss:
It sounds way more interesting and people buy such BS and are impressed, that's the only reason.

+1
[Galaxy S II General] sloanyboy:
I still use this method it suits me fine at least i know whats going on with it
[Galaxy S II General] ahmadshawki:
Thanks for every one for this. I just have one question. My HP Touchpad stays on 100% after unplugging for a long time (more than two hours in airplane mode) but my Epic 4G Touch phone drops to 99% the second I pull of the charger cable (even in Airplane mode and every "apparent" process is off). Now is this right? Should I just live with this? If not, what can I do? Should I just keep charging this 1% every minute until it stays 100%?

Obviously I had more than one question, but the heck, this is the place we all go to find answers. Right?
[Galaxy S II General] ram3n:
Glad to hear that works fine.

Mate, don't be afraid, this isn't disturbing.

You can recalibrate with my method, as it is 100% safe with any danger.

Then, you should to do some cycle of charge/discharge and let your battery the time to auto-calibrate itself.

Cheers
[Galaxy S II General] GoldGanja:
Another POV ...

First of all THX ram3n for this post.

Now let me tell you the story so far, my S2 comes from box with XWKI8 firmware, and a "standard" duration of roughly 20 / 22 h of moderate use, 3g connection always on, standard apps, whatsapp + facebook + gmail, no auto sync etc.

When i first upgraded to XILA2 firmware and fully charged the phone i was amazed from the battery. Same usage but 36 h!!! :cool:

Next day I was out for work and phone dropped to 0%... by the next charge it lasted only 20 / 22 h ... :confused:

Now, last night i installed the speedmod kernel k19 and i've followed your suggestions for the battery...

As i turned on the phone the % of the battery dropped instantly @ 99, but i think it's a normal behavior because during boot the phone consumes more energy.

I'll let you know if something good will come from this steps... for now, thanks again.

First Update:

After 10h 16m battery is at 60% :( no call no activity just 1h and 20m of display on! In CPU spy i have a deep sleep of 8h, 1h @ 200MHz, 30min @ 500MHz etc.

Second update:

I can't post images cuz i have less then 8 posts, but anyway...

Battery is @ 9%, after 21h and 30 min, Display is 27% with 2h 50m, Calls are 13% with 34 min and Android OS is 35%.

CpuSpy stat: Deep Sleep 17h, 2h 24m @ 200MHz, 1h @ 500 MHz, 30m @ 800 etc.etc.

So right now no changes for me, i still got my 20 / 22 h of use... first charge after K19 speedmod and ur suggestion... i'll update you again tomorrow when battery is again ~5%!
[Galaxy S II General] jihoonim20:
Thing is, I'm kinda worried if it'll totally screw up my battery.
[Galaxy S II General] JJEgan:
You cannot screw a battery up by using it and recharging when its needed .

jje
[Galaxy S II General] ram3n:
Let see if some apps are causing wakelocks.

Install Betterbatterystats http://xdaforums.com/showthread.php?t=1179809

You have my words : Using my method can't destroy your battery.

Be reassured my friend :)
[Galaxy S II General] Socotroco:
Entropy512, thanks man for being so clear, it´s good to read something with some research behind. Thanks again.

Saludos from Uruguay.
[Galaxy S II General] lexx.yomen:
Hmm. Stupid question. So, what is this calibrate thing do? Basically, it will extend the life of the battery? Is that what I meant by this "calibrate" thing?
[Galaxy S II General] mdcarter67:
I'm having some strange battery activity after calibrating. My battery was at 44% after 11 hours of use, then I rebooted and my battery had dropped to 9% then climbed to 10%. Anyone else setting anything like this?
[Galaxy S II General] lexx.yomen:
Okay. After reading all posts from first page till the last page, I think I know what's the purpose of this calibrate thing. I don't really experience what others were experiencing maybe because I'm using easy battery saver app which was really handy for me. It extends my phone battery life to 2 or 3 days without of course using it.

I might try this tomorrow when my battery is around 5%. I'll let you know what happened. I hope this will make my battery life extend. I hope it will. A big thumbs up for the TS :D
[Galaxy S II General] lexx.yomen:
This "calibrate" thing really did do well to my battery because yesterday after I fully charged the battery without first calibrating it, around 10-15 minutes the battery went down 99% but today after doing the calibrating, it only went down to 99% after 40 minutes. Such a big improvement.

So, combining my new "calibrate" battery + using the app "easy battery saver" will really make my battery last longer.

Kudos to the one who make this thread. It is really effective :D
[Galaxy S II General] ahmadshawki:
I did the exact procedure but nothing changed. May be I have a problem with an app. May be go SMS is always running in the background, our may be Viber. But yesterday I deactivated everything on the phone, sync, data, auto rotate, GPS, brightness and I still lost 12% in less than 7 hours. And when I started using the phone it dropped about 20% more. Actually it is dropping while i'm writing the reply NOW. When I started it was showing 13% and nite it shows 9%.

The question is: hire do I know if the battery is calibrated correctly? And again whenever I disconnect the charger, it becomes 99% instantly. What exactly should I do in steps (if possible) please. And now it's showing 8% after killing almost all the running apps and removed the viber and Skype syncing.

Someone help me please, my Barry doesn't go over 8hours with average use...
[Galaxy S II General] ram3n:
Nice, now enjoy your little monster mate :D

Dude, if you've followed all my steps, your battery is well calibrated.

Now, It seems that your problem has nothing to do with calibration but some apps running on background which are causing wakelocks.

1. Install Betterbatterystats http://xdaforums.com/showthread.php?t=1179809. BTW, it's 100% free. ;)

2. Look for some partial and kernel Wakelocks.

3. Delete or Freeze these malicious applications.
[Galaxy S II General] GregX80:
I have galaxy s2 over a year and what I can tell u mate. If u change your kernel or Rom u have to wait one cycle of full discharge and charge battery to 100%.After that your battery should be calibrated. If you want to have good battery life u have to start use for example phenomenal kernel with simple&clean Rom and u'll get 3-4 days of normal use on stock battery. There is no other way than change your kernel and Rom for something better than stock.

Regards
[Galaxy S II General] ahmadshawki:
I'm thinking about unrooting and restocking

Thanks for the tip. I rooted because I wanted to tether and I wanted to add the Arabic language to my device. I didn't find a way to add the Arabic language to any of the ROMs and I'm always wondering if Sprint would find about the tethering, so I'm thinking or unrooting and returning back to stock. My wife uses her phone a lot and it lasts easily more than a day but of course she doesn't have the sync on.

Anyway, I'll some other stuff and report back if I find anything unusual.

Note: On Epic 4G Touch we don't have what you called "Phenomenal" kernel. We do have the stock kernel but I never felt the difference. The battery sucks on either of them...

---------- Post added at 11:51 PM ---------- Previous post was at 11:47 PM ----------

I'll try that. I installed the app and I'll report back if I find the reason for the battery drain. Thanks a lot...
[Galaxy S II General] ahmadshawki:
Ok, I tried the app but didn't understand how to use it. All the names are com.something.android and stuff like this. Also, I removed most of the apps and nothing changes.

I guess i'm done trying. I don't have anything else to do. I'll try changing the ROM and the Kernel and them test without any apps installed to get an idea of how the battery works. May be that will do it.

One last question before I go, someone here mentioned that after disconnecting the charger, it stays 100% for 40 minutes. How is that possible? How to achieve the maximum capacity? How to determine the mv in the battery that every one keeps mentioning that his battery carries 4190mv or 4200mv or whatever?

Thanks in advance...
[Galaxy S II General] lexx.yomen:
By any chance, are you referring to my post? If you do, then it only happen after I did the calibrating. Please do take note that my phone was idle and it only went down to 99% after 40 minutes or so. To be exact, I only lose 1% of discharging in 1hr which is a big improvement from my previous 3-4% before doing the calibrating.

Regarding the mv, afaik there is an app where you can see the mv of your battery which the guys here kept mentioning.
[HTC Wildfire S] wildfire-s:
does anyone no a skin that will work on jikantaru's sense rom because when i install them they dont appear on my list :L
[Samsung Galaxy Nexus] AllGamer:
original topic http://xdaforums.com/showthread.php?t=1311786