Database Info

[HOW-TO] - Battery Calibration

There has been much confusion and frustration surrounding our battery life and these custom roms. Some of us have great battery while others are having horrid problems.
I am writing this guide in the hopes it will help all of you with problems getting that great battery life.
This is a guide written from my own experience and technical understanding.
First, Your phone should drain, on average, 1% per hour or less while in standby mode (screen off). If you are not getting this average, you need to calibrate your battery.
ALWAYS flash a new rom with your phone at 100% battery - no exceptions!
i know some guides say to run battery down to 2% and then charge, but i never had much luck with this.
1) Before you flash your rom, charge your battery to 100% with the phone ON.
2) Once it says fully charged, turn the phone off and plug it in and wait for the on screen display to say 100% (this will take 5 to 10 min)
3) Turn the phone back on, and plug it in and charge till it says 100%
4) turn off the phone and charge again while off until the on screen battery indicator says 100% (again this will take 5 to 10 min)
5) repeat steps 1 thru 4 as many times as you feel comfortable, I recommend at least twice (I do it 3 times)
6) when you are satisfied with the charge, and the phone is still OFF with the indicator saying 100%, unplug the phone, remove the battery, and place the phone in download mode (hold vol down and plug into the PC)
7) flash your package (this is done in odin with the battery removed)
8) The first boot after the flash needs to be into Clockwork Recovery, wipe battery stats at this time (most roms will boot into recovery automatically, if not, boot into recovery manually)
9) after you have wiped your battery stats, wipe cache and other data (if the rom you are flashing requires this, if not, skip this step)
10) Boot the rom to the homescreen.
11) from this point on, you will use your phone like normal until the phone completely shuts off. this SHOULD take a while. you should see improved battery life during this stage. If not, dont panic, just run the battery down until the phone shuts off
12) once the phone shuts off (try to time this to happen at bedtime) plug the phone in and allow it to charge in the OFF position
13) once it is at 100% again, use the phone like normal and enjoy your new battery life.
IF YOU ARE DOING THIS WHILE NOT FLASHING A NEW ROM
Do steps 1-4 as many times as needed, I recommend at least twice, i do this 3 times
on the last charge up (your phone should be off while charging during this step) unplug the phone and boot directly into recovery and wipe battery stats. then proceed with the rest of the guide.
TO TEST THIS
charge to phone to 100%, try not to mess with it for an hour or so.. (light usage at most) you should still be at 100% or 99% after an hour. If you are at 95% or below, then the calibration has failed. (unless you have been using the phone or are in a very low to no signal area).
this calibration method is crucial to good battery life. Before I started doing this i was getting very bad battery life. Click on my username and look at my previous posts.. you will read about me *****ing badly about my battery, this is what I did and it has worked amazingly well.
I hope this helps
I combined a lot of techniques ive seen in other threads and some websites and then created this technique which seems to work really well.

I have used this technique and can confirm, it works well if done properly.
From my Charge - XDA Premium

Are the first few steps what is referred to as "bump charging"?
I think this has worked quite well. I flashed Humble 1.2 (at 40% battery) last night, charged up, then started this procedure. After I got done, I took it off the charger and after 15 minutes of trying a new game, listening to a minute of music, and checking various things, I was still at 100%. i left it off, went to bed with wi-fi on, and woke up at 95%. Awesome. My all-day phone is back.

szgeti said:
Are the first few steps what is referred to as "bump charging"?
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Yup glad that this works for folks
Sent from my SCH-I510 using XDA App

What happens after the calibration process? do i have to do this everytime i charge my battery or does like normal mean i can just leave it charge whenever. Also with what frequency should i be doing this? once a month calibration?

Just did this... 1 hour 15 mins. and still at 100% Sent two text messages out and played Words with Friends for a minute. Thanks!

Did this and it didn't work advice on what I am doing wrong I did the bump charge 2 times ran the phone down 100% and am now looking at 88 percent of next to no use after about an hour and a half of having the phone on.
Sent from my SCH-I510 using XDA App

thecontrolm7cl said:
Did this and it didn't work advice on what I am doing wrong I did the bump charge 2 times ran the phone down 100% and am now looking at 88 percent of next to no use after about an hour and a half of having the phone on.
Sent from my SCH-I510 using XDA App
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Click to collapse
I am in the same boat with you.....I'll just have to accept the fact that I will have to charge every 6 hours, which was a 2 hour step up from the TB.

This works, going on 17 hours and still at 65%.
Sent from my SCH-I510 using XDA App

brian1972ct said:
I am in the same boat with you.....I'll just have to accept the fact that I will have to charge every 6 hours, which was a 2 hour step up from the TB.
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What I am curious to know is what is usage like for the people that this worked for. Don't get me wrong I'm not doubting the op but I am a pretty heavy user and even so I'm not really experiencing this awesome battery life everyone talks about when I'm not using it heavily
Sent from my SCH-I510 using XDA App

For all of you that are getting the great life, what percentage does it list for display? This is under settings > about phone > battery use.

I'll have to try this method. My battery life is actually worse now after I tried doing the drain to 2% method. I'll report back with my observations.

Are we talking 3G or 4G here?
I would find it useful when people are talking about how good (or bad) their battery life is to know if they are in a 4G area and have 4G turned on, or are they using 3G only?
Trying to figure out how bad a hit 4G takes on my phone...
Thanks.

knodalyte said:
I would find it useful when people are talking about how good (or bad) their battery life is to know if they are in a 4G area and have 4G turned on, or are they using 3G only?
Trying to figure out how bad a hit 4G takes on my phone...
Thanks.
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So I tried this out yesterday...I don't have a rooted phone so I could not wipe battery stats (does anyone know how to do this without rooting your phone?)...but I did follow steps 1-4 three times and I have gone 23 hours on my charge without having to plug it in. I am in a 4g area and had 4g and background services on for the full 23 hours. Had bluetooth, GPS, and wifi turned off. I sent a couple texts, used whatsapp to send texts, used google voice to send texts, made 3 phone calls (about 4 to 5 min each) played angry birds for about 20 min, played words with friends for 10 min, surfed the web on and off, was on tapatalk and browsing forums for about 20 min and I installed a new keyboard and web browser on my phone in those 23 hours.

I am very curious to know if this will improve battery life after that first initial bump charge.
If you do a regular charge after depleting the charge, do you still see improved battery life?

triton302 said:
I'll have to try this method. My battery life is actually worse now after I tried doing the drain to 2% method. I'll report back with my observations.
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Well... did this too with no luck. I'm just going to have to deal with the fact that this is a power hungry phone.

triton302 said:
Well... did this too with no luck. I'm just going to have to deal with the fact that this is a power hungry phone.
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You may have a defective phone or battery.

hooskins said:
You may have a defective phone or battery.
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I'll try another battery... but I've already been through too many DC's and I'm not returning this one. I have no issues with it at all, just this battery problem.

msticlaru said:
6) when you are satisfied with the charge, and the phone is still OFF with the indicator saying 100%, unplug the phone, remove the battery, and place the phone in download mode (hold vol down and plug into the PC)
7) flash your package (this is done in odin with the battery removed
I dont understand this, you can go to download mode without battery? Or flash a rom with no battery?
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BatTusAi said:
msticlaru said:
6) when you are satisfied with the charge, and the phone is still OFF with the indicator saying 100%, unplug the phone, remove the battery, and place the phone in download mode (hold vol down and plug into the PC)
7) flash your package (this is done in odin with the battery removed
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Click to collapse
I dont understand this, you can go to download mode without battery? Or flash a rom with no battery?
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Yes. The phone will pull the necessary power for download mode and the Odin flash from the USB port. Just be sure to use a primary USB port (usually the ones on the back of the computer), rather than a hub, as the hub tends to cause problems.

[Q] Battery Calibration

I read a lot of thread about battery calibration so I want to know if someone try this on XT720 and if it's really usefull and not dangerous for the phone.
Thank you

It is useful and not dangerous at all. Your battery has, if stock that came with phone, a full charge of 4.2v.
So let's say that you have been conservatively using you phone most of the day and are at 70%. You decide to flash the Hellmonger edition or CM6 but you make a nandroid backup first. You flash them and it goes horribly wrong and your phone power dwindles down to 30% and you freakout and charge it back up.
When it is charging, you decide to hold off on flashing for a bit and want to go back to your "home" ROM, whatever that may be. You let your phone charge up to 100% and re-flash your back up. Once it reboots and settles down, you happen to notice that just 5 mins ago you were at 100%, but now after flashing your backup, your battery shows 70%.
30% drop in 5 mins is rediculous. Yes it is, bit it didn't really drop 30% in 5 mins because when you backed up your original ROM, you also backed up your data/system/batterystats.bin that was calibrated to 70%.
If you use Battery Calibrator and charge it up fully, run app, hit it and then unplug, it deletes the data/system/batterystats.bin and in a few seconds (5 ithink) it creates a new one with you proper charge and voltz.
So if you flash a lot, this is good for you. Or you can delete the batterystats.bin manually if you want, but there's an app for that.

Woodrube said:
It is useful and not dangerous at all. Your battery has, if stock that came with phone, a full charge of 4.2v.
So let's say that you have been conservatively using you phone most of the day and are at 70%. You decide to flash the Hellmonger edition or CM6 but you make a nandroid backup first. You flash them and it goes horribly wrong and your phone power dwindles down to 30% and you freakout and charge it back up.
When it is charging, you decide to hold off on flashing for a bit and want to go back to your "home" ROM, whatever that may be. You let your phone charge up to 100% and re-flash your back up. Once it reboots and settles down, you happen to notice that just 5 mins ago you were at 100%, but now after flashing your backup, your battery shows 70%.
30% drop in 5 mins is rediculous. Yes it is, bit it didn't really drop 30% in 5 mins because when you backed up your original ROM, you also backed up your data/system/batterystats.bin that was calibrated to 70%.
If you use Battery Calibrator and charge it up fully, run app, hit it and then unplug, it deletes the data/system/batterystats.bin and in a few seconds (5 ithink) it creates a new one with you proper charge and voltz.
So if you flash a lot, this is good for you. Or you can delete the batterystats.bin manually if you want, but there's an app for that.
Click to expand...
Click to collapse
So, if I understand, it's not so usefull because after I lose my 30%, if I charge and I have 100% it's really 100% not 70% right ?

I would say that it is always best to start from a clean slate. It deletes that batstat file and starts anew. Can't hurt, but if you are flashing ROMs every 3rd day like most of us, it does come in handy.
For the moral of the stroy, it will not damage your phone. Just a one click app that you can do manually with Root Explorer if you wanted to.

Woodrube said:
I would say that it is always best to start from a clean slate. It deletes that batstat file and starts anew. Can't hurt, but if you are flashing ROMs every 3rd day like most of us, it does come in handy.
For the moral of the stroy, it will not damage your phone. Just a one click app that you can do manually with Root Explorer if you wanted to.
Click to expand...
Click to collapse
Ok, thank you, I will use it when I will flash a new ROM.

Do you actually have to drain the battery fully after calibration?
Sent from my MilestoneXT720 using XDA App

eejin2 said:
Do you actually have to drain the battery fully after calibration?
Sent from my MilestoneXT720 using XDA App
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Its recommended that the battery drain fully, and then be recharged without interruption. I guess thats to give android a full scale from full to empty, to help better report battery stats and consumption.
However for me full drain means 10-15%, its hurts the battery to be drained till the phone powers off.

sohrab.naushad said:
Its recommended that the battery drain fully, and then be recharged without interruption. I guess thats to give android a full scale from full to empty, to help better report battery stats and consumption.
However for me full drain means 10-15%, its hurts the battery to be drained till the phone powers off.
Click to expand...
Click to collapse
Haha battery calibration definatly helps the battery a lot but u suggest not draining battery fully??

androidlover123 said:
Haha battery calibration definatly helps the battery a lot but u suggest not draining battery fully??
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I used to drain it fully till my phone turned off before calibration but I read a very detailed article about how draining the battery completely can hurt it. So I choose to drain it till 5-10% which is good enough

How come sometimes when the battery is full it shows 4200mah like it should but sometimes it shows less like around 4165mah in the battery calibration app? At 4165, I still left it there to charge to see if it would increase or not but it didn't...
Sent from my MilestoneXT720 using XDA App

I know that the last little bit of charge just trickles in and takes a long time. If mine is at somewhere between 4150 and 4200, i call it good and go from there. If it was showing at say 4095 and 100%, then there might be something wrong with either the data or the battery. If you are sitting at 4165, then it is charged for the most part.
The app and what it does is more for when you are flashing a ROM and have around 60% and then once booted up fully, you charge it up to 100%. Decided you don't like your ROM and go back to your original ROM via backup, it will show 60% instead of the 100 or 90% you had before you went back to back up b/c you backed up the batstat bin when you nandroided your original ROM.
How about this:
ROM: Epicsteelblue 70% (and you made a backup) Then went to CM6, charged and hit calibrate battery at 100%. Used CM6 for a few hours and decided it wasn't your bag. Your batter is at 50%. You flash back to your Epicbluesteel ROM and you know for a fact you had 50% before you flashed back, but now once totally booted, you are showing 70%. This is why you use the battery calibrator after you flash a ROM. Gotta create a new batstat bin for you "fresh" ROM (even though it is a backup).
Hope this helps explain better.

eejin2 said:
How come sometimes when the battery is full it shows 4200mah like it should but sometimes it shows less like around 4165mah in the battery calibration app? At 4165, I still left it there to charge to see if it would increase or not but it didn't...
Sent from my MilestoneXT720 using XDA App
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Click to collapse
That happens sometimes to me aswell. The battery calibration app shows the battery full at 4165 or somewhere in that range. What I do with that is bump charge it. So if battery calibration shows 4165, i just calibrate it and turn the phone off while it is connected to the charger. When it turns off the charging screen appears and shows 100%, i leave it there for an hour or two. Then remove and turn the phone on. If you go into the battery information itll show the charge to be 4200 or close to that. Hope that was helpful you can try it next time.
EDIT: The reason I turn the phone off and let is charge is that when it reboots after fully charging to 4200 it can create a fresh battery stats. Remember battery stats are only rebuilt upon boot. If you calibrate your battery and then dont reboot its useless. To test calibrate it, and then use it for awhile and then try to recalibrate it the app will indicate that there are no battery stats avaible to delete. This is because the ROM has not made any new battery stats and will only make them on boot.

hey guys has anyone tried this method (http://forum.xda-developers.com/showpost.php?p=11803458&postcount=10) of calibrating battery? it seems the dev says that if u use his method, you can calibrate without downtime!!

wow this is damn cool. but its kinda complicated. the old way feels better for me i think...

Battery Updates
The battery updates every 10%, is there any way to make it update more precisely, like every 5%?

I've never been able to get anything better that 10% battery increments

Okay thanks maybe in a future rom this would be nice.

Hi
Is their a way to change from 10% to 1% increameants.
Sent from my XT720 using xda premium

eejin2 said:
How come sometimes when the battery is full it shows 4200mah like it should but sometimes it shows less like around 4165mah in the battery calibration app? At 4165, I still left it there to charge to see if it would increase or not but it didn't...
Sent from my MilestoneXT720 using XDA App
Click to expand...
Click to collapse
It is the property of all rechargetable battery, 4.2V can only see at the moment charging progress just finished. when the power management IC pull of charge current, battery's voltage will drop a litte in a very short time, like you said, 4.165V for example. And, because of your charger is connected, battery will not drain, It won't be another charging progress witch you are expecting.

I know I'm digging up an old thread here, so sorry for that. I've recently tried a few other ROMs, but since have come back to CM6.3.7. I always do the battery calibration thing when I flash ROMs and each time I've tried it lately, it gives me odd information in the Battery Usage screen. I charged my phone to 100% yesterday before leaving work and when I got to work today, it showed 70%, which seemed normal, but the Battery Usage screen showed "1h 24m since last unplugged" and I know I hadn't plugged it into the wall or USB for about 12 hours. I did restart once....could that be the reason why the time since last unplugged is incorrect?

Battery issues! Running out of ideas. Can someone help? (SOLVED)

I can't seem to figure out whats wrong with my phone. I have a draining issue with my battery and i don't know if my battery indicator is not accurate. I used odin and went back to stock on a full indicated battery. Then I flashed VB and adrenaline shots 1.4-1 and camera tweak and scrolling mod and booted the phone and let set for 10 minutes before I reloaded all my apps. My battery was indicating it was at 100% ok so i unplugged the battery and wham it dropped to 79% plugged it back in and it started charged from where it left off at 79%. After a few min and the phone goes to sleep mode and indicates 100% i unplug the phone and it charged from where it left off at 79%. So i kept unplugging it and plugging it back in every few minutes till i got to 100%. So sounds ok now but i had to reboot my system and wham again down to 79% and even with the uv settings my battery drains fast. I tried calibrating the battery and also charged it with the phone being off and no results. All I want is a full charge as I work long shifts lol. thanks and i hope this is understandable the way i tried to describe it.
Also Thanks to the devs on here who dedicate their time to making this device do what it was meant to do..

Try letting the phone die completely. After about ten minutes power it back on then let it die completely again. Leave it off for an hour then plug into wall charger. Let it charge to 100% while off. After it hits 100% unplug it and leave it sit for an hour while off. Then turn it on and use normally.

hechoen said:
Try letting the phone die completely.
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Not to contradict hechoen - but take note that Samsung recommends against completely discharging your battery in the manual for the phone.

+1 (edit: on previous calibration routing)
also you may try to "jump start" MAX17042 (fuel gauge) chip... when your phone at 100% on a charger (verify this by looking at battery voltage - OS Monitor / Misc tab. or other similar apps) - voltage should be around 4.15 - 4.2V. When you disconnect charger - what would be the voltage then? If around 4.0V then may be your battery is going south.
To "jump start" FG - turn off the phone, pull battery out and wait for 5 - 10 min. - just to be sure internal circuits got completely discharged.
When you install battery, FG chip will use "average" model for new lipo... see if it makes difference.

Yeah I've heard that this kind of batteries last longer if charged continuously (short and often charges) instead of full charges after letting it die. Something about battery cycles or some.
I'd recommend fully charging and battery calibration from market. Also, reflash rom but not tweaks yet, and see how it behaves. Then install tweaks/mods and see if the battery continues to decrease rapidly. If it does, get an app for battery info, check its health.. Your battery might be dying for good.
Sent from my SGH-T959V using XDA App

mikeflash said:
battery calibration from market.
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Click to collapse
Google has also debunked the battery calibration myth. There is a thread about it in the General Section with a link to the article.
To add to the recommendations...
Check how often your phone is set to sync. Big battery drainer. Auto starting apps. And display brightness.

if all fails you could try to reflash and see if that fixes it
Sent from my SGH-T959V using XDA App

lumin30 said:
Google has also debunked the battery calibration myth. There is a thread about it in the General Section with a link to the article.
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Click to collapse
+1 on that too... glad to see that finally common sense based on knowledge prevails "Battery Calibration by wiping batterystats file" apps myths.

lumin30 said:
Google has also debunked the battery calibration myth. There is a thread about it in the General Section with a link to the article.
Click to expand...
Click to collapse
Wait, I didn't say battery calibration is going to make your battery last longer. It doesn't do that.
But it's a fact that after installing a rom a battery calibration is needed. Normally, developers code their install scripts to perform a battery calibration when installing the rom, so this is not needed afterwards, I still do it anyways when charging the first time to 100%.
I for one had the issue for the first time when installing a rom (don't remember which one) and after rebooting or shutting down the phone, the battery would go from >90% to <20% for no reason at all. Someone here at XDA suggested battery calibration app (or, manually at CWM/advanced, clear battery stats) and the issue was gone. Maybe the rom is misreading battery data and that could cause this kind of issues... which a battery calibration would fix it.
Just saying.. if there's an option for it in CWM, then chances are it is needed for some reason!

Vlad_z said:
+1 on that too... glad to see that finally common sense based on knowledge prevails "Battery Calibration by wiping batterystats file" apps myths.
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Indeed. It's on our wiki, too, under the batterystats.bin Buzz Word entry.

So i think I needed to do a factory reset. I re flashed vahnilla black and then did a factory reset in the rom. Before I re flashed the rom I
had 60% as soon I restarted the phone on the freshly flashed rom it dropped to 1% then I did a factory restart within the rom and when I rebooted the battery indicated 20% and I am in 16% charge now, only went down 4% within the last 6 hours. So I will run it till it dies tonight and charge it with the phone off to see the results tomorrow.
Thanks Raver for the help in this matter. Will keep everyone posted on the end results.
Sent from my SGH-T959V using xda premium

lumin30 said:
Not to contradict hechoen - but take note that Samsung recommends against completely discharging your battery in the manual for the phone.
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Click to collapse
No contradiction at all. You shouldn't fully discharge all the time. But once in a while it's actually good for the battery. Especially lithium ion. Take a look at this. For those of you who don't like to read that much just skip to the bottom.
http://batteryuniversity.com/learn/article/inner_workings_of_a_smart_battery

hechoen said:
No contradiction at all. You shouldn't fully discharge all the time. But once in a while it's actually good for the battery. Especially lithium ion. Take a look at this. For those of you who don't like to read that much just skip to the bottom.
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Forgot link?

thomas.raines said:
Forgot link?
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Sure did. Sorry about that.

vwgtiturbo1 said:
So I will run it till it dies tonight and charge it with the phone off to see the results tomorrow.
Thanks Raver for the help in this matter. Will keep everyone posted on the end results.
Sent from my SGH-T959V using xda premium
Click to expand...
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so you call hechoen (guy who posted calibration routing) Raver...

Vlad_z said:
so you call hechoen (guy who posted calibration routing) Raver...
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no actually raver answered a few questions for me through pm. but hechoen thank you and i will do that when my battery is fully charged. thanks again to everyone for the info! will update tomorrow!

I fully charged my battery last night while it being off and let it sit for a hour before turning it on. Well great seemed to now indicate it's fully charged after a hour I threw on adrenaline shots 14-1 with camera and scrolling mod. Let it air for 30min went into recoveryand fix perms. When I rebooted the phone the battery dropped again from 80 to 60 and then went back up to 75. Then I rebooted again it dropped to 25% and then I rebooted again and now it indicates 59% I believe this battery is heading south. What do you guys think?
Sent from my SGH-T959V using xda premium

....................

drywolf said:
How old is the battery. If it is a quality battery it should take between 500 and 900 recharges. Do you own a volt meter?
Also calibrating your battery should be done occasionally. Not to somehow make your battery last longer, but to clear out the old data and use new data to show your batteries usage. Just like resetting the computer in your car that shows average MPG. Fresh input will give you a better idea of what your car is getting today and same goes for your battery stats.
http://batteryuniversity.com/learn/article/battery_calibration
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Click to collapse
I have calibrated the battery. Everything seems to of been working fine until I added adrenaline shots. Once I rebooted after installing adrenaline shots my battery started acting up again. I pulled the battery out for 10 min and popped back in and now I'm indicating 56% after 4 hours of heavy use with wifi on. :/
Sent from my SGH-T959V using xda premium

Is this a factory battery? Or a aftermarket ebay/amazon battery?
Im sure people will disagree but some of those aftermarket batteries are not the greatest quality.
Do you live in a town that had a battery store, like the interstate battery shop or something of the likes? Most of those places can do a brief diagnostic of the battery and tell you if it is bad. Or if you have a volt meter fully charge it and test it that way.
It really sounds like the battery is being stupid. There should not be any reason installing A.S. could cause a instant battery drain. If that were the case your phone would be so hot you could not hold it. Because draining that much juice in that little of time would indicate you have a short or something of that nature.

[P] Phone is charging itself?

Hello. This issue has been going on for a while now. But when I take my phone off the charger when its not fully charged. The battery percentage keeps going up. For example if I unplug it at 78%, the percentage will gradually go up to like 86-88%. Can anyone give me a hint as to why its doing this? Thanks!
Sent from my SAMSUNG-SGH-I727 using XDA

MrTenseJACOB said:
Hello. This issue has been going on for a while now. But when I take my phone off the charger when its not fully charged. The battery percentage keeps going up. For example if I unplug it at 78%, the percentage will gradually go up to like 86-88%. Can anyone give me a hint as to why its doing this? Thanks!
Sent from my SAMSUNG-SGH-I727 using XDA
Click to expand...
Click to collapse
Battery stats are wonked out.
Do you have Clockwworkmod recovery installed? Or is this a pure stock unrooted?
EDIT: Mr. Jacob, what are you tense about? LOL ! Just kidding....

Try using an app called battery calibration (can be found in the app market) when the phone is fully charged. This will reset all the battery stat logs and set your 100% to a true 100%

I have clockwork installed. I'm running SkyICS rom. And I have already tried battery calibration.
PS: And nothing really xD its been my screen name since the early Xbox days
Sent from my SAMSUNG-SGH-I727 using XDA

Battery calibration does nothing. Normally I wouldn't recommend that u COMPLETELY drain the skyrocket battery as its lithium based and can cause dead cells, yours needs calibrating, and wiping battery stats or using a battery calibration app won't help (both of these are myths by the way, Google if). Use phone until its completely dead, and won't turn on at all, only vibrate with a black screen. Then charge phone for a continuous 8 hours uninterrupted, that should fix it

MrTenseJACOB said:
I have clockwork installed. I'm running SkyICS rom. And I have already tried battery calibration.
PS: And nothing really xD its been my screen name since the early Xbox days
Sent from my SAMSUNG-SGH-I727 using XDA
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Click to collapse
As a first try, charge to 100%. Then go into CWM recovery and wipe battery stats. It should be good to go....On ICS, thsi seems to fix it for me.
IF you then stilll have weird battery problems a proper recallibration will be in order.
I had to just wipe battery stats when charged to 100%. DON'T just wait for 100%. Alow the phone to get to fully charged.....if you have "Full Charge" notification on your ROM wait for that.

chappatti said:
As a first try, charge to 100%. Then go into CWM recovery and wipe battery stats. It should be good to go....On ICS, thsi seems to fix it for me.
IF you then stilll have weird battery problems a proper recallibration will be in order.
I had to just wipe battery stats when charged to 100%. DON'T just wait for 100%. Alow the phone to get to fully charged.....if you have "Full Charge" notification on your ROM wait for that.
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Click to collapse
Half of this is right chappatti
charging to 100% and letting it sit for at least an hour even after full charge notification is the best way. Wiping battery stats in cwm won't actually do anything though, thats a myth.

Actually, for lithium ion batteries, it is not recommended to let them discharge to zero. It's better to run it down to 10% or so (i usually do about 5%). and then charge it completely. Rinse and repeat over a few days, and there should be a difference.
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
Sent from my SAMSUNG-SGH-I727 using Tapatalk

icenight89 said:
Half of this is right chappatti
charging to 100% and letting it sit for at least an hour even after full charge notification is the best way. Wiping battery stats in cwm won't actually do anything though, thats a myth.
Click to expand...
Click to collapse
Yup, ice, ur are right. Wiping stats is not about battery charging stats....
https://plus.google.com/u/0/105051985738280261832/posts/FV3LVtdVxPT
What a revelation !! It's like realising my religion is all wrong !
BUT, BUT, BUT : reading the whole battery stats discussion, it i also clear that the business of charging for an hour after 100% is also not worthwhile, but is just a customer gimmick to make people feel thier batteries are topped off. This was started by HTC and the consensus is that is also does not help.
The simple solution is to let the battery go through 2-3 charge-discharge cycles.

Saitou33 said:
Actually, for lithium ion batteries, it is not recommended to let them discharge to zero. It's better to run it down to 10% or so (i usually do about 5%). and then charge it completely. Rinse and repeat over a few days, and there should be a difference.
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
Sent from my SAMSUNG-SGH-I727 using Tapatalk
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A good read. Very useful, thanks !

I had this same issue with my Exynos G2, my problem was flashing different roms or putting a theme on. My fix came not by wiping battery stats but only doing flashes at 100% and plugged in. I never noticed it on my SR though. I'm not saying don't try what the others say, just giving you more options.

[Q] bad battery meter?

My Samsung GS2 Skyrocket is about a year old and when I updated to Android 4.1.2 a few months ago, my battery meter went wonky. At first, it would show a max charge of about 75%, even if the battery was at 100%. Swapped it out with an identical battery from my husband's identical phone and the "new" battery still only showed 75% and when my husband put the "old" battery into his phone, his phone showed an accurate reading on the battery. Over time, my phone has dropped the maximum charge percentage down to 3% and the phone behaves as if this is the correct reading. I just swapped batteries out again, and my 3% battery magically became a 100% battery and the battery I swap with went from 87% to 3%. We've done 2 factory resets, tried turning the phone completely off when charging, truned off only wi-fi while it was charging and nothing has worked. As soon as you disconnect it from the charger it shuts down. I have tried 2 other battery widgets and they ALWAYS agreed with the Samsung meter. Any ideas? I'm using my daughter's old SG2 that has other issues of its own and we've run out of things to try.
Thanks for any assistance!
KJ

I don't really believe in battery calibration, but its still worth a try. Look it up on XDA. Will post a link as soon as I get to a PC.
You could also try flashing ICS 4.0.3 and see if the issue persists. If yes, it must be a hardware problem.
"To err is human, to forgive is divine."
Sent from my SGS II

If I remember correctly battery calibration is not mandatory on the SGS2 because once the battery is depleted and charged full to 100% - the "meter" is reset. Do not unplug the phone as it reaches 100%, let it rest for some time before unplugging.

Connect your phone to computer.
Delete all the unwanted files and folder from both memory card and internal memory.
Go to recovery by pressing volumeup+Centre button+ power and clear cache, and if you are able to go to advance then clear battery stats.
Restart the phone with charger on and let the full charge to happen and report back.

battery meter
I'm going to let my husband do that - he's the elecronics wizard, not me! I'll let you know how it goes!

When to disconnect?
When do I disconnect the phone from my computer? Do I leave it connected the whole time?
vishal11in said:
Connect your phone to computer.
Delete all the unwanted files and folder from both memory card and internal memory.
Go to recovery by pressing volumeup+Centre button+ power and clear cache, and if you are able to go to advance then clear battery stats.
Restart the phone with charger on and let the full charge to happen and report back.
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Click to collapse

Disconnect after deleting the files from the internal memory. Enter recovery with it unplugged and then connect to charger as it's booting out of recovery.
Sent from a galaxy far, far away

And this thread has been in the wrong forum for the past week & a bit. Belongs here (Yes I'm asking mods to move it).

Thread moved :good:

move
kennyglass123 said:
Thread moved :good:
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Thank you for doing so. I'm sorry I posted it to the wrong forum!
KJ

Tried all of the suggestions and nothing has worked. Looks like I'm in the market for a new phone....

Take the phone apart and check connections to the USB board. I'm betting hardware failure of your USB board it's a relatively cheap part you could replace in a few minutes after obtaining one.
Sent from my SAMSUNG-SGH-I727 using Tapatalk

battery meter
Super! We'll give it a shot. Thanks!

battery meter
Was going through the whole thread again and realized that I didn't try to reflash to 4.0.3, as someone suggested. Can anyone point me in the correct direction to do this?
Thanks!!!!

kjwil said:
Was going through the whole thread again and realized that I didn't try to reflash to 4.0.3, as someone suggested. Can anyone point me in the correct direction to do this?
Thanks!!!!
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?p=26056924

Have you tried recalibration yet? People say it doesn't work but always has worked for me.
1. Kill your battery to zero.
2. Leaving the phone off, charge it to 100%
3. Turn it on with it still at 100% and download the battery calibration app (assuming you're rooted) and press the calibration button. 4.Restart it and pull the charger as soon as the screen shuts off.
5. Use the phone until it dies and shuts itself off.
6. While dead, plug in charger and turn it on. Wait til it hits 100% or keep it plugged in for at least two and a half hours.
7. Unplug it and should be working just fine! If not, it's a hardware issue.
I've had problems with the battery meter with some ROMs, so it could help by doing a full wipe and installing another ROM or the same one.
I hope this helps, cheers!