Q: iOS 6 iPhone 4s battery drain

I had same battery problem with my 4S after I updated it to iOS 6.  There might be the problem for the indication of battery. it shows 100% battery life within one hour after you plug in to charge the iphone but the battery might be only 50% charged.  I notice that I could fully charged the battery within a hour after downloading iOS 6. Normally, It took couple hours to have battery fully charged. I let battey drain to 10% and charged the battery overynight.  It works like before now.  The number of battery percentages might be wrong with iOS6.  it makes you think the battery is fully charged but it doesn't.  Charge the battery longer or plug in the power cable before you go the bed.  Hopefully, it helps.

I took the plunge last night and updaed my iPhone 4S to iOS 6.0.  I downloaded the full package and installed it using iTunes rather than do the OTA update.  I can't say for sure but the majority of the people that are posting to this thread with the battery life issue seem to have done an OTA install.

The install went fine.  But as soon as I got control of my phone back from iTunes I could watch the battery meter drop about 1% a minute.  I turned off all the things that I had turned off before and a number of the new ones tha I am not going to use anyway.  I don't want Shared Photo streams, I only need phone, messages, and Calendar items in notifications,  I have 5 email addresses that I use, all are set to fetch manually (Thanks for pull down to refresh by the way) Virtually everything in Privacy is off, especially the items in System Services. I only left Cell network Search on. Turned off the iAdds thing.  Very few locations items turned on.

Anyway once I was set and happy with what I had turned on and off battery life still dropping 1% per minute.  Did a reset.  No help.  Did a Network Connections reset, No Help.  Did a Reset all settings.  No help. 

So I ran the battery down to 8%, plugged it in and went to bed.  I took it off the charger at 6 AM PST and have been using it normally since then.  It is now nearly 9 am and I am down to 96%.  So about 2% per hour under normal use.

I will see how it goes over the course of the day and report back tomorrow.

I think the issue is that the battery meter needs to be reset via a full charge from a dead or nearly dead battery to work the way it should.  I am sure that a lot of the new features are total battery hogs and those will get sorted out soon, I hope.  But in the mean time draining and charging the battery up to past full seems to help.

I've done a few things since over the past few days and battery seems to have settled. It's 8 hours and I'm at 88% with little phone usage (wifi, apps) when just after the ios6 update I would be at around 30-40%

I've turned off and on twitter/facebook integration, reset all settings, run the phone till it switched off then charged from mains a few times, closed all apps then restarted phone, reset network settings.

Basically did everything possible to get the phone in an "as new" state without erasing any content. My guess is that something was causing the processor to run hot constantly in the background which I've now been able to disable, since the phone isn't running hot on standby anymore, but does get slightly warmer doing anything else.

I'm keeping an eye on background running apps (e.g. I always have skype running) so if I notice any particular app draining the battery, I'll post again. But battery life is adequate right now.

99.9% of people who know enough to post in here, already know how to kill background apps from running...that is not the problem. I tend to think each of us has a problem unique to our phone, our settings, our apps etc. Why else has Apple been unable to fix the battery drain issues present ever since ios 5? Whatever they did with 5.1.1 or whatever, made my drain even worse. Good luck getting Apple to admit this or care.

My battery drain has no ryhme or reason. One day, I might be able to go 8 hours without touching the phone and without losing a single %. The next day I am losing 30% per hour....makes no sense. Turning features on and off, reseting stuff til the cows come home, nothing seems to have an impact, it either drains or it doesnt, regardless of the steps I take. I used to fill out an Excel sheet documenting any changes I made to my phone and the rate of battery drain, I could never find any direct/consistent correlations.

That's what i am talking about...

******* phone...

Hello guys,

I have a similar problem since I updated to iOS 6, apparently suddenly at night or evening my iPhone twice lost all it's battery. I found these two logs in the Settings of the iPhone. I have an iPhone 3GS 16Gb that has been working perfectly until today (except for the lags with iOS 5 lol).

Here are the logs :

Most recent log :

Incident Identifier: 4659A3A8-81D8-4A79-B2A6-0F60167BEA0F

CrashReporter Key:   c103c9ec36c6c5711e4e76576f12fb7346775341

Date:                2012-09-25 00:41:50 +0200

OS Version:          iPhone OS 6.0 (10A403)

dataaccessd: com.apple.DataAccess:78-0x20aa3b90     NoIdleSleepAssertion == 255, held for 00:00:01

dataaccessd: com.apple.DataAccess:78-0x20a94dc0     NoIdleSleepAssertion == 255, held for 00:00:01

dataaccessd: com.apple.DataAccess:78-0x20abaf40     NoIdleSleepAssertion == 255, held for 00:00:01

dataaccessd: com.apple.DataAccess:78-0x2092e220     NoIdleSleepAssertion == 255, held for 00:00:01

dataaccessd: com.apple.DataAccess:78-0x2092d8e0     NoIdleSleepAssertion == 255, held for 00:00:00

dataaccessd: com.apple.DataAccess:78-0x20abb8b0     NoIdleSleepAssertion == 255, held for 00:00:00

apsd: APSCourier(tcpStream:dataReceived:)     NoIdleSleepAssertion == 255, held for 00:00:01

Hardware Model: N88AP

Awake Time: 06:38:16 (23896)

Standby Time: 20:21:26 (73286)

Partial Charge: 0

Capacity: 0

Voltage: 3207 mV

Previous log :

Incident Identifier: BA6FE428-EEAD-4B84-961C-328BDD4C6646

CrashReporter Key:   c103c9ec36c6c5711e4e76576f12fb7346775341

Date:                2012-09-24 01:30:43 +0200

OS Version:          iPhone OS 6.0 (10A403)

dataaccessd: com.apple.DataAccess:102-0x1f9dec90     NoIdleSleepAssertion == 255, held for 00:00:01

dataaccessd: com.apple.DataAccess:102-0x1ed279d0     NoIdleSleepAssertion == 255, held for 00:00:01

dataaccessd: com.apple.DataAccess:102-0x1f9a8d60     NoIdleSleepAssertion == 255, held for 00:00:01

dataaccessd: com.apple.DataAccess:102-0x1f9d9fa0     NoIdleSleepAssertion == 255, held for 00:00:01

dataaccessd: com.apple.DataAccess:102-0x1eddd630     NoIdleSleepAssertion == 255, held for 00:00:00

dataaccessd: com.apple.DataAccess:102-0x1f9f1d80     NoIdleSleepAssertion == 255, held for 00:00:00

Hardware Model: N88AP

Awake Time: 07:12:11 (25931)

Standby Time: 07:12:11 (25931)

Partial Charge: 0

Capacity: 1

Voltage: 3397 mV

Seems like the "NoIdleSleepAssertion == 255" is the problem but I have no clue what it is. Do you all have this too ? Can you check your Settings to see ?

I hope someone can help us.

Thanks !

The worst story is when we think downgrade iOS, WE CAN'T!

Does at night or evening mean when on wifi? My phone drains like crazy on wifi, not too too bad on 3G, at least usually. Only error reports I have are iMessage, FaceTime and viber. Some people reported safari bookmark error reports and were unable to delete those bookmarks from safari.

I think the wifi doesn´t work really good. Too much time to load a web and finish sometimes. Maybe the speed of wifi in some cases is a problem in the charge of battery.

Wowser, have literally tried everything (4s) and now resorted to a restore in DFU mode using iTunes and setting up as a new phone. I deliberately haven't downloaded any apps and whilst standby time is great, if I start using it I get 5mins per 1% just doing basic tasks with all location, iCloud, Bluetooth, ads off etc.

Will run it down and do a full charging cycle but as it stands it appears unlikely that it's caused by anything that is loaded after the install (third party apps etc).

Will see how the overnight charge goes and let you know but pain in the @rse if this is the way to fix it. Poor show from Apple.

Sporadic behavior like that sounds more like a battery indicator issue than a battery draining issue.

I'm experiencing the same problem as everyone else in this thread. Is there anyone who has been in contact with Apple and know when a bug fix might be available (days? Week? Months?)? Since my phone has a standby time of 3 hours (!!) these days, I can no longer use my phone. I've only had it for 6 months and still have warranty, but it is not tempting to send the phone for repair if I will soon be able to fix the problem myself.

Happy to report that i actually just got a call from Apple regarding my posts here so they do indeed read this.  They do not seem to know what is happening, but asked that i install a "battery profile" app and i agreed.  Hope that Apple has not turned into the  Big Brother that they made fun of back in 84.    They indicated that they have many working  on this and many on overtime so they are aware and are trying to get this solved ASAP.  Will update as i can. 

Prove it D:

You might try this. 

Charge the battery longer or plug in the power cable before you go the bed.

The battery indicator might be wrong with iOS6.  it makes you think the battery is fully charged but it doesn't.

I had same battery problem with my 4S after I updated it to iOS 6.  I charged the battery overynight lastnight.  It works like before now.