Didn't calibrate the battery - Epic 4G General

Just flashed Syndicate Loaded ROM the other day and didn't know about calibrating the battery, is it too late to calibrate now or will I need to reflash the ROM?
Sent from my SPH-D700 using Tapatalk

You can calibrate the battery at any time
Sent from my SPH-D700 using XDA App

ive yet to calibrate my battery.. at all

How do you calibrate the battery?

charge all the way
unplug, replug phone, let it top off again
wipe battery stats
discharge all the way
charge all the way

I very rarely recalibrate my batteries. I got a deal on a couple spare batteries and chargers so I just swap batteries as needed, which is usually only once a day.

AndrewZorn said:
charge all the way
unplug, replug phone, let it top off again
wipe battery stats
discharge all the way
charge all the way
Click to expand...
Click to collapse
Sorry if this is a dumb question (I don't own an Epic 4G, I'm asking for two members of my family who do), but how do you wipe battery stats? Do you have to be rooted to do that?

I've seen 25 hours without calibration.

Both Epics in my family are only getting a few hours out of their batteries, even with no use, and they used to get very good battery life, which leads me to believe that it's a calibration thing, but they're not rooted and I can't find any way to wipe the battery stats on their phones.
Can anyone help me?

oldjackbob said:
Both Epics in my family are only getting a few hours out of their batteries, even with no use, and they used to get very good battery life, which leads me to believe that it's a calibration thing, but they're not rooted and I can't find any way to wipe the battery stats on their phones.
Can anyone help me?
Click to expand...
Click to collapse
I wish they would build such a calibration function into the OS, so it could be done without rooting. Meanwhile, the only way I know of for a non-rooted user to wipe the old battery stats is to do a factory reset. But that means backing up and restoring apps and data.

Maybe an app on both stock Epics is running the battery down. Check Running services in settings>applications to see if there is something running on both. Sometimes it is an app trying to sync like Facebook, Oovoo or email. Set syncs for a hour or more. These are original stock batteries right?
Do you BONSAI?

Related

"recondition batttery" FAIL

I tried the"recondition battery" I let my phone die wiped battery stats let phone charge fully and now my phone dies even faster than before.. Wth I should just stook with what I was getting smh.
Sent from my SGH-T959 using XDA App
Battery life is really relative, you can't control everything you do on a daily basis on your phone. You can't control the number of email, text message you received, etc. or the signal reception.
So, perhaps the battery now die faster because you change the way you used your phone? It's a possibility.
It's you.
I say that because you don't follow instructions.
Step 1 is to CHARGE FULLY FIRST. Where did you see that it says let it die and wipe?
Reading is fundamental.
Sent from my SGH-T959 using XDA App
I use my phone the same and on bionix 1.8 thread someone posting two ways to do it one was chargefully and wipe and they other was let die then wipe..
Should I charge fully then wipe now to see if that will fix?
Sent from my SGH-T959 using XDA App
Bionix says to charge fully then wipe..
I doubt it's possible that reconditioning would worsen your battery life. It could be a bad app or a setting that needs to be changed. For example, the Facebook app is defaulted to refresh itself every hour.
Aside from reconditioning (which really is just to kind of calibrate your battery status with the rom) it's best to check your running apps. If you leave GPS on, some apps run it in the background etc etc.
I think people spend too much time tracking their battery life that they ultimately cause it to worsen. No need to wake the screen every 5 mins to track battery etc. I get EXCELLENT standby time using bionix mainly bc I don't take out my phone unless I need it to use, vs tracking battery.
Sent from my SGH-T959 using XDA App
Yeah that's the thing when I first flashed bionix1.7 my battery would last forever buy now even on standby without checking my phone it will die.. It didn't do that before the failed attempt at battery recondition which I should not have done in the first place hopefully it will get better
Sent from my SGH-T959 using XDA App
Anyway to fix this? Should i fully charge then wipe?
Sent from my SGH-T959 using XDA App
There's no guarantee that your battery will be fixed once you do it correctly. You could just have a defective battery. My first Vibrant was defective that could not get any reception and on top of that my battery would drain real fast.
Rodriguez92 said:
Anyway to fix this? Should i fully charge then wipe?
Sent from my SGH-T959 using XDA App
Click to expand...
Click to collapse
Your question has been answered twice already:
disturkis4u said:
Step 1 is to CHARGE FULLY FIRST.
Click to expand...
Click to collapse
disturkis4u said:
Bionix says to charge fully then wipe..
Click to expand...
Click to collapse
Do I really need to say it again? Charge fully, then wipe!
Actually, You are supposed to let it charge fully > let it die > plug it in & let it charge (While off) > wipe batt stats > boot > done
I also read a post where it said letting the battery die completely is bad for "health" I guess I'll just not mess with it at all lol
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Master™ said:
Actually, You are supposed to let it charge fully > let it die > plug it in & let it charge (While off) > wipe batt stats > boot > done
Click to expand...
Click to collapse
Er, if you wipe the stats, won't it "forget" the draining and charging you did first, making them pointless?
i reconditioned my battery when i flashed bionix 1.8 and haven't noticed any difference in battery life.
beren28 said:
Er, if you wipe the stats, won't it "forget" the draining and charging you did first, making them pointless?
Click to expand...
Click to collapse
Simple answer, no! You will wipe all battery stats previously stored. Starting with a fresh charge and no batt data the fone will have to re-learn the battery data and this should give you a more accurate representation ( cuz thats all it really is ) of battery state from that point on. Hope this helps.
jdkackley said:
Simple answer, no! You will wipe all battery stats previously stored. Starting with a fresh charge and no batt data the fone will have to re-learn the battery data and this should give you a more accurate representation ( cuz thats all it really is ) of battery state from that point on. Hope this helps.
Click to expand...
Click to collapse
No, his point is that you have extraneous steps. Wiping stats AFTER a charge--drain--recharge is pointless. All you have to do is charge to full with the phone off, wipe stats, reboot.
Rodriguez92 said:
I also read a post where it said letting the battery die completely is bad for "health" I guess I'll just not mess with it at all lol
Sent from my SGH-T959 using XDA App
Click to expand...
Click to collapse
Yeah, in theory you can reduce the life of the battery. But batteries are cheap, and I doubt I'll ever have this phone long enough to see my batteries go bad.
Ima just leave my phone alone the roms are good enough
Sent from my SGH-T959 using XDA App
Exactly. Why charge it, drain it, then delete? The stars start over. The draining and charging are forgotten.
Sure, you wasn't to start fully charged, but draining it first seems pointless.
Sent from my SGH-T959 using XDA App
Straight from Cyanogens Wiki-
http://wiki.cyanogenmod.com/index.php?title=Troubleshooting
"Battery recalibration
If you're experiencing higher than normal battery drain, try the following:
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.)
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.
Do not charge the phone until after draining the battery completely, resulting in it automatically shutting off.
Recharge the phone completely and then use as you normally would."
jdkackley said:
Starting with a fresh charge and no batt data the fone will have to re-learn the battery data and this should give you a more accurate representation ( cuz thats all it really is ) of battery state from that point on.
Click to expand...
Click to collapse
I've wondered this -- what does the conditioning actually "fix"? (I understand it doesn't affect the way the battery physically charges & drains.) Is the problem (pre-reconditioning) that the phone is thinking/saying it's fully charged when it's not, and so you're not starting off with the 100% charge you thought you were? Or is the problem that the phone thinks (and represents) that the battery is discharging faster than it really is, as you use it? Or something else?
Also, I've read others on here talk of allowing the battery to completely discharge, and then charging to 100%, ~1x per month -- without any talk of "wiping stats." Is that supposed to be something different altogether? Thx

Extreme Battery Level Drop After Reboot, Increases During Use

The topic pretty much explains it. I've been using different modified stock roms and now I'm on the latest nightly of CM7, and I keep having this issue. After a reboot at around 50%, the battery drops to 15%. The weird part is that while I continue to use the phone, it slowly rises back up to sometimes 30% and then starts going back down. I've always cleared battery stats when flashing and calibrated (which I believe is unnecessary), but I don't know if this is a problem with the battery, the phone, or if anyone else is having the same issue?
Attached is a screenshot of battery usage. You can see I never actually charged the phone.
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I have exactly the same issue.
Sent from HydrOG3N MOD S2.
Technology Evolves, Android Evolves.
HydrOG3N is THE Revolution.
[email protected] looks like a bow and arrow..
anyway guys, you need to recalibrate your battery, its not being read accuracy.
download BatteryCalibration from the market, charge your phone till 100% (not just 100% but when it beeps, that its truely at 100%), then use BatteryCalibration to calibrate your battery, and then drain it to 0.. (crank full brightness, turn on LED flashlight, blast internet radio, whatever makes it drain faster to get this part overwith), then recharge it to max.
so;
charge to full 100%
while still plugged in, run BatteryCalibration
discharge to 0%
recharge to 100%
battery successfully calibrated, you will now have an accurate reading
I had exactly the same issue on 3 different custom roms....finally resolved by going bck to stock rom
mgxplyr said:
The topic pretty much explains it. I've been using different modified stock roms and now I'm on the latest nightly of CM7, and I keep having this issue. After a reboot at around 50%, the battery drops to 15%. The weird part is that while I continue to use the phone, it slowly rises back up to sometimes 30% and then starts going back down. I've always cleared battery stats when flashing and calibrated (which I believe is unnecessary), but I don't know if this is a problem with the battery, the phone, or if anyone else is having the same issue?
Attached is a screenshot of battery usage. You can see I never actually charged the phone.
Sent from my GT-I9100 using Tapatalk
Click to expand...
Click to collapse
Sent from my GT-I9100 using XDA App
soraxd said:
[email protected] looks like a bow and arrow..
anyway guys, you need to recalibrate your battery, its not being read accuracy.
download BatteryCalibration from the market, charge your phone till 100% (not just 100% but when it beeps, that its truely at 100%), then use BatteryCalibration to calibrate your battery, and then drain it to 0.. (crank full brightness, turn on LED flashlight, blast internet radio, whatever makes it drain faster to get this part overwith), then recharge it to max.
so;
charge to full 100%
while still plugged in, run BatteryCalibration
discharge to 0%
recharge to 100%
battery successfully calibrated, you will now have an accurate reading
Click to expand...
Click to collapse
I'll try this one more time and report back.
mgxplyr said:
I'll try this one more time and report back.
Click to expand...
Click to collapse
Sorry guys, but your method with BatteryCalibration is useless ....
If you wanna do a correct calibration, look at here http://forum.xda-developers.com/showthread.php?t=1312273
Cheers
Put back the battery on the right side.
8. Turn on the phone.
9. Pray the Battery god
And that post is just nonsense based on the old battery bump method .
jje
mgxplyr said:
The topic pretty much explains it. I've been using different modified stock roms and now I'm on the latest nightly of CM7, and I keep having this issue. After a reboot at around 50%, the battery drops to 15%. The weird part is that while I continue to use the phone, it slowly rises back up to sometimes 30% and then starts going back down. I've always cleared battery stats when flashing and calibrated (which I believe is unnecessary), but I don't know if this is a problem with the battery, the phone, or if anyone else is having the same issue?
Attached is a screenshot of battery usage. You can see I never actually charged the phone.
Sent from my GT-I9100 using Tapatalk
Click to expand...
Click to collapse
i have the same problem when i use custom roms.
i have been using pure stock rom by wannam but rooted for the past week with 12 hours aday syncing and surfing the net and plenty of voice calls via viber and my battery lasts at least 16 to 18 hours.
right now i am using odexed KL3 Kernel KL2Base KL1modem 2.3.6 and it is absolutely amazing interms of battery life and performance.
http://forum.xda-developers.com/showthread.php?t=1292825
http://www.multiupload.com/06I066U6S8
i have gotten rid of all samsung craps through titanium backup. i only have samsung apps application cuz of some paid apps which are for free such as tapatalk and many more on samsung app store.
my free memory is 97mb (original rom free memory is only 27mb)
i dont use any task killers i use 1Tapcleaner pro.
JJEgan said:
Put back the battery on the right side.
8. Turn on the phone.
9. Pray the Battery god
And that post is just nonsense based on the old battery bump method .
jje
Click to expand...
Click to collapse
Maybe, you wanna share a better way to all of us ?
Are you using speeded kernel. If you are then it is because logging and debugging is off.
Sent from my GT-I9100
Completely stock phone never rooted.
Same problem.
Just sayin'
Sent from my GT-I9100 using XDA App
Got the same here, very strange, on CM7
Sent from my GT-I9100 using XDA App
This thing only happens on CM7 for me. It had 40% before reboot and like 15% after. However mine only increased to about 17% then started dropping as usual. This never happened on any stock ROMs I've tried(stock, not themed/modded stock).
Sent from my GT-I9100 using xda premium
did you
did you rsolve the problem ? how? I have the same problem and I tried more stock roms ... I don't know what tot do ....
Its nothing to do with calibration etc, its just how the fuel gauge chip works, it learns and more accurately reports usage over time. For example, if you reboot and (I can't remember the actual voltages for the S2) you have 1200mV, the chip goes, "ah, that is 15% battery." Then as you use it more, it relearns its settings and goes "aaah, my mistake 1200mV is really 30% battery. I'll display that instead."
Its been covered frequently that "calibrating" the battery of the S2 in any way but actually using it, is next to useless.
Sent from my GT-I9100 using xda app-developers app
---------- Post added at 11:05 AM ---------- Previous post was at 11:03 AM ----------
Also just noticed this thread is a year old, but hopefully it will help the poster above.
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I'm having this problem too, what did you all do besides get new phones?
Got the same here, after update stock jellybean
Had this problem, when my S2 was half a year old.
I got the original Extended Battery and that solved this issue completely.
The replacement Battery has held up since 2013
soraxd said:
[email protected] looks like a bow and arrow..
anyway guys, you need to recalibrate your battery, its not being read accuracy.
download BatteryCalibration from the market, charge your phone till 100% (not just 100% but when it beeps, that its truely at 100%), then use BatteryCalibration to calibrate your battery, and then drain it to 0.. (crank full brightness, turn on LED flashlight, blast internet radio, whatever makes it drain faster to get this part overwith), then recharge it to max.
so;
charge to full 100%
while still plugged in, run BatteryCalibration
discharge to 0%
recharge to 100%
battery successfully calibrated, you will now have an accurate reading
Click to expand...
Click to collapse
did it but it still there... phone flicks and goes off at or below 40% wont turn on again:crying:
same here and I got the 2000 mAh samsung battery back in the days but now it happens with both of them also when my phone shuts off the screen brightness start flashing weirdly

Wiping Battery Stats Doesn't Fix or Increase Battery Life.

Yup, I said it. Nothing. Nada. Zip. Well, deleting the .bin file does do something...it resets the battery stats. Wanna know what else resets the stats?? Charging your phone to 100%. So, whatever benefit you saw from deleting the .bin was a placebo effect. Don't get me wrong, deleting it won't hurt anything. But it doesn't help anything either, and it certainly doesn't calibrate your battery. The only thing that file contains are stats, such as:
1. info about wakelocks
2. info about partial wakelocks
3. info about screen on time
4. info about screen brightness
I'm tempted to get into how lithium ion cells work, but that is a boring subject. I will say that li-ion cells don't have a memory to them, so there really isn't a "calibration" process. I will say that if you have piss poor battery life, you should consider the following:
1. An application/process that isn't allowing the phone to sleep correctly (keeping this general)
2. Any SamSprint firmware or derivative thereof
3. Knock it off with the overclocking. If you wanna screw with frequency tables and voltages, or let someone else do it and flash their kernel, be my guest. But don't ***** about your battery life if you do
4. YOUR BATTERY!!!!
Wanna know how I fixed the ****ty battery life on my girlfriend's Epic? I bought her a new battery I nice new shiny Epic Touch 4g battery with 20% more capacity and BAM, 2 days of battery life easily instead of 4-5 hours.
Seriously though, so many things affect not only battery life, but battery lifespan e.g. age (many users have had this phone for 1.5 years), # of charge/discharge cycles, excessive heat or cold (I bet a lot of people keep their phone in their pocket or a purse, huh?), etc. And while there may be quality control standards in the battery manufacturing process, not all batteries are equal and it's very possible that a battery was well below its stated capacity even when it was brand new.
Anyway, I'm tired and I need a coffee. I'm interested to hear others chime in and add to the discussion. Flame on! jk
Ryan
Crap! This was supposed to go in general... Mods, please move
This is what I've been saying all along. You put a battery in. You charge it. End of story.
All these people wasting literally hours upon hours on "calibrating" their battery are tools who should not be members of a development forum.
http://www.androidcentral.com/wiping-battery-stats-doesnt-improve-battery-life-says-google-engineer
zeppelin481 said:
Crap! This was supposed to go in general... Mods, please move
Click to expand...
Click to collapse
lol was gonna say, the only flaming you should get for this is for being in the wrong section!
Specialksg1 said:
lol was gonna say, the only flaming you should get for this is for being in the wrong section!
Click to expand...
Click to collapse
It was a total accident. I had a thread I was writing and the session expired. Lost the whole thing. Rewrote and didn't pay attention to the section. I expect to be flamed for it
zeppelin481 said:
Crap! This was supposed to go in general... Mods, please move
Click to expand...
Click to collapse
maybe if you drank your coffee you wouldn't make noob mistakes!
I saw you asked to be moved to general, that was my first question as well
Many people will argue that wiping battery stats is actually WORSE for battery life while using the same battery. After cycling perhaps. I think switching batteries requires a stat wipe though.
ksmullins88 said:
maybe if you drank your coffee you wouldn't make noob mistakes!
Click to expand...
Click to collapse
You're probably right. And I technically had 2 cups today, just not my usual gallon! I hope a mod moves it soon because I feel like a huge tool now...
zeppelin481 said:
You're probably right. And I technically had 2 cups today, just not my usual gallon! I hope a mod moves it soon because I feel like a huge tool now...
Click to expand...
Click to collapse
Lol! Hey at least it wasn't a completely idiotic thread like some of the people post in developement so you get at least 1 point for that... on topic... completely agree anybody that sees better battery life after Calibrating their battery just didn't use their phone as much after doing so... now maybe everybody will quit telling the people with bad battery life to calibrate and it will fix their issues...
Sent from my SPH-D700 using Tapatalk
Here we go...
Wiping battery stats has NOTHING to do with battery 'life'. It does however effect time from a full charge if charged from the epic itself.
What the file that is removed does it tell android what the battery level is for logging and status info. When something changes like the battery strength (age) or life change from the rom/kernel/tweaks then you need to delete that file or else it will assume the older setup is used as a norm. Android uses the data to tell the battery to stop charging at a level of 95ish% and also to power down at 5ish%. If these values are incorrect the phone won't keep a charge as log or power off earlier.
zeppelin481 said:
You're probably right. And I technically had 2 cups today, just not my usual gallon! I hope a mod moves it soon because I feel like a huge tool now...
Click to expand...
Click to collapse
Lmao, I hope they leave it in here just because
Sent from my SPH-D700 using XDA App
marcusant said:
Here we go...
Wiping battery stats has NOTHING to do with battery 'life'. It does however effect time from a full charge if charged from the epic itself.
What the file that is removed does it tell android what the battery level is for logging and status info. When something changes like the battery strength (age) or life change from the rom/kernel/tweaks then you need to delete that file or else it will assume the older setup is used as a norm. Android uses the data to tell the battery to stop charging at a level of 95ish% and also to power down at 5ish%. If these values are incorrect the phone won't keep a charge as log or power off earlier.
Click to expand...
Click to collapse
But this is right... sometimes if you don't clear your battery stats your phone still thinks you have, for example, say 75%, when you really have something less, like 50%. Thus when you charge it, it will think its charging to 100 from 75 rather than from 50. Leaving you 25% less battery or whatever and your phone will seem like its dying faster. Only because you haven't "fully" charged the battery. So in some cases, calibrating the battery by removing the file is neccessary.
Sent from my SPH-D700 using XDA App
Moved......NooB
marcusant said:
Here we go...
Wiping battery stats has NOTHING to do with battery 'life'. It does however effect time from a full charge if charged from the epic itself.
What the file that is removed does it tell android what the battery level is for logging and status info. When something changes like the battery strength (age) or life change from the rom/kernel/tweaks then you need to delete that file or else it will assume the older setup is used as a norm. Android uses the data to tell the battery to stop charging at a level of 95ish% and also to power down at 5ish%. If these values are incorrect the phone won't keep a charge as log or power off earlier.
Click to expand...
Click to collapse
This. End of story, wiping does help in certain cases.
Sent from my SPH-D700 using xda premium
Next time someone complains about battery life I'm gonna tell em to order an epic touch battery, its really the only way
Sent from my SPH-D700 using xda premium
Battery stats do nothing... I never charge my battery. I swap out with charged batteries. You can NOT make your power on time longer with battery stats!!! I've proved that with swapper batteries versus charging and wiping stats... It's a myth only because there is a file which tracks status. That file is rewritten to and reset everytime I swap batteries.
IT'S A MYTH!!!
Sent from my SPH-D700 using XDA App
troyolson92 said:
Battery stats do nothing... I never charge my battery. I swap out with charged batteries. You can NOT make your power on time longer with battery stats!!! I've proved that with swapper batteries versus charging and wiping stats... It's a myth only because there is a file which tracks status. That file is rewritten to and reset everytime I swap batteries.
IT'S A MYTH!!!
Sent from my SPH-D700 using XDA App
Click to expand...
Click to collapse
This. The battery stats contain nothing about your battery percentage. Those who think that are misinformed.
I thought the percentage is directly related to the voltage left on the battery. So how could any stats affect that?
xopher.hunter said:
Next time someone complains about battery life I'm gonna tell em to order an epic touch battery, its really the only way
Sent from my SPH-D700 using xda premium
Click to expand...
Click to collapse
Look out! Here comes the Peanut Gallery! But seriously, my point was that most people don't stop and think for even a second that their battery might be the problem. If you have a 2 year old battery that you've put through the ringer and it you are getting ****ty battery life, you should quit being a cheap ass and buy a new battery. The Epic Touch battery is $18 on Amazon and a 20% increase in capacity. Kind of a no brainer. Unless you're a cheap ass. Or slow. Or you think that wiping a binary file will magically fix it. Or you're a cheap ass.

Battery drain

Hello!
I rooted my phone as of yesterday, I charged it all night and when I took it off today the battery went from completely full to dead withint 3 hours of no use. I did not use the phone at all.
Any ideas?
If you just rooted your phone, you should not have battery drain... Try to temporarily disable root (with Voodo OTA RootKeeper for exemple)
Use better battery stats to nail down which app is causing the drain
Did you try wiping your battery stats in CWM - advanced?
There's also an app, Battery Calibration, on the Play Store that may help with that.
Not uncommon to get weird battery readings after changing rom's or rooting.
slaphead20 said:
Use better battery stats to nail down which app is causing the drain
Click to expand...
Click to collapse
+1 that app will tell you exactly what's bogging down your cpu, and which apps prevent proper deep sleep mode.
Sent from a galaxy far, far away
PermaFried said:
Hello!
I rooted my phone as of yesterday, I charged it all night and when I took it off today the battery went from completely full to dead withint 3 hours of no use. I did not use the phone at all.
Any ideas?
Click to expand...
Click to collapse
This is soooo strange. Not a normal behavior!! Before you root your phone, how the battery lifes goes??? Are you in a stock or modified ROM? Wich kernel are you using?
I faced this issue a couple weeks ago. Android S.O was the culprit and it was driving me crazy. I was using a custom ROM (RemICS-UX). I solved the problem returning to stock and erasing everything, then i reflashed the ROM and the kernel, in my case Devil3 0.79. If you want to give it a try!!
After that my batterys life is pretty fine, during at least 2 days!
Feel free to ask anything you want! Cheers mate
Sent from my GT-I9000 using xda app-developers app
Go through a couple more full charge cycles, if android os usage isn't very high then, it should be fine.
Edit: on second thought, draining the battery without use in 3 hours is extreme, and would suggest that the CPU is running at max speed all the time. If it doesn't solve itself or improve a lot after a few more charge cycles, reflash everything.
Using GT-I9000 my sent Tapatalk 2 from.
Did you just root your phone or did you flash another ROM? Some ROMs have horrible battery life.
The stock battery usage monitor (Settings>Battery) should be enough to tell you what ate your battery. If it's a particular app you're running, try disabling that and see if it improves. If the usage is mostly "Android System", "Mobile standby", or something like that, then you have a tougher problem. The free app CPU spy will let you know if something is keeping your CPU usage high. Better battery stats is pretty cheap and will give you much more specific information.
+1s for BetterBatteryStats and waiting a few charge cycles before judging/debugging your battery drain, especially if you changed your kernel to root or flashed a rom.
I find that after flashing a new rom or kernel my phone, the battery level shown in recovery mode is higher than in the rom's settings, for a couple days. (You can see batt level in semaphore's recovery). I once dud a lazy search about this and found nothing, but I figure that's what is meant about waiting a few cycles gir your battery to calibrate.
sent from a telephonic device
groksteady said:
+1s for BetterBatteryStats and waiting a few charge cycles before judging/debugging your battery drain, especially if you changed your kernel to root or flashed a rom.
I find that after flashing a new rom or kernel my phone, the battery level shown in recovery mode is higher than in the rom's settings, for a couple days. (You can see batt level in semaphore's recovery). I once dud a lazy search about this and found nothing, but I figure that's what is meant about waiting a few cycles gir your battery to calibrate.
sent from a telephonic device
Click to expand...
Click to collapse
or u can just use the app batterycalibration after flashing a new rom
Friend try with this modem..
http://forum.xda-developers.com/showthread.php?t=993576#
TheWeeknd said:
or u can just use the app batterycalibration after flashing a new rom
Click to expand...
Click to collapse
There's no such thing as "calibrating your battery". It's a myth. Wiping your battery stats file doesn't do anything other than reset the tracking of what's using power. It doesn't magically fix your battery meter. Flashing a new ROM doesn't leave left over data, again a myth.
Battery life is never consistent after flashing because your ROM needs to "settle" for a day or two first and during that time your ram and cpu usage are all over the place.
The rest is a placebo effect.
Sent from a galaxy far, far away
Idea
I think I may know what is happening to you as of now. Try to bring up the Battery settings if you are on ICS and take a screenshot and post it here. If my 'spider' senses are correct, your phone did not go to 'sleep' and remained awake.
Since I can't put my signature for unknown reasons...(Maybe because I just created an account since I did not want my old one)
Please donate to [email protected] (html not allowed yet) on Paypal if I helped you
Currently I'm experiencing a huge battery drain too. I used both tools which where mentioned here in this thread and when the drain occours, CPU spy reports that my SGS didnt go in deep sleep at all with turned off display, it was at least at 100mhz all the time! I attached 2 logs from better battery stats and it seems like the NotificationService is causing it?
I'm using JW6 PDA JW4 Modem and JVC CSC in combination with the MNGB 0.5.8 Kernel.
Definitely, now you got to find out what is causing it!
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How to wipe battery stat,How to fix incorrect battery status

I have problem with battery status.I try delete file batterystats.bin in my data-system but not fix it.All version CWM not "wipe battery stats" line..Help me
Apparently wiping battery stats doesn't do anything at all, it only wipes the actual history of battery usage, the same you see when you go to the menu and click the battery.
The whole subject is really a lot of speculation that as there doesn't seem to be a definite answer to calibrating the battery.
What seems to work for me and what seems to be advised more often is to fully discharge the phone, by normal usage then leaving it charging through the night, repeat the process the next day. When doing this process don't charge it in the middle of battery, you must wait until it dies.
Sent from my Nexus 4 using Tapatalk 4
@Mottz is right. Wiping that file only removes the history of what app used how many percent of the battery. This has been confirmed by a Google engineer.
https://plus.google.com/105051985738280261832/posts/FV3LVtdVxPT
Sent from my Nexus 4 using XDA Premium 4 mobile app
Hey, my device also shows incorrect battery %age. To fix that all I need to do is follow @Mottz's procedure, correct?
japmeet said:
Hey, my device also shows incorrect battery %age. To fix that all I need to do is follow @Mottz's procedure, correct?
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Yes.. :good:
Mottz said:
Apparently wiping battery stats doesn't do anything at all, it only wipes the actual history of battery usage, the same you see when you go to the menu and click the battery.
The whole subject is really a lot of speculation that as there doesn't seem to be a definite answer to calibrating the battery.
What seems to work for me and what seems to be advised more often is to fully discharge the phone, by normal usage then leaving it charging through the night, repeat the process the next day. When doing this process don't charge it in the middle of battery, you must wait until it dies.
Sent from my Nexus 4 using Tapatalk 4
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Click to collapse
Unfortunately this didn't work for me. I tried charging through the night and then discharging it completely and charging it completely again. I also tried deleting the batterystats file (even though I know it doesn't do anything)
So what do you suggest I should do? Get the phone replaced or get the battery changed?
I live in India and the phone is from Canada, so replacing the phone will take some time but I can get the battery replaced for around $20
Mottz said:
What seems to work for me and what seems to be advised more often is to fully discharge the phone, by normal usage then leaving it charging through the night, repeat the process the next day. When doing this process don't charge it in the middle of battery, you must wait until it dies.
Sent from my Nexus 4 using Tapatalk 4
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Click to collapse
This does nothing for a lithium battery.
Except maybe kill it faster.
What exactly is your battery issue?

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