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The description of WiFi sync in general settings says. "Automatically sync with iTunes on your computer when your iPhone is plugged in to power and connected to Wi-Fi." So your iPhone will not use Wifi sync when it's not plugged in.

You can still sync your iPhone manually when its not plugged in to a power source. The option states that it will sync automatically when you plug the phone to a power source.

If iTunes sync is on, your phone will show up in iTunes even after it's unplugged.
 
You can still sync your iPhone manually when its not plugged in to a power source. The option states that it will sync automatically when you plug the phone to a power source.

If iTunes sync is on, your phone will show up in iTunes even after it's unplugged.

As I just said, the option is grayed out for me, I can't sync unless it's plugged in, you have a bug.
 
Not the iPhone 4. That thing had amazing battery life.

Agreed. I would often get 3+ days with it in standby. I found that signal strength has a huge effect on battery life. At home I get all bars of signal most of the time, and the 4 could easily lose just 10% a day if not used.

Move around, use the phone, have push or fetch email on and that increases to 15% to 20% a day, and thats what I used to see - add the odd bit of surfing, mail reading and phone calls & messaging and that was around 30% drop a day.

I am seeing less life with the old 4 and 4S under iOS 5, and I had noted the location icon was on a LOT, even though there should be no need for it to be on. I have adjusted a few settings and will have to wait until tomorrow to see how the battery lasts as I'm at work and mobile coverage here is 0 to 1 bar and kills the phone very quickly - 50% drop in 12 hours is normal
 
It may not "automatically" sync, but if you press the "Sync" button in iTunes it will happily sync to your iPhone whether or not it is plugged in. In order to do this, and relevant to this thread, is the iPhone must be listening on WiFi in order for this to be possible - which does consume power. I'm not saying that is what is causing the trouble, but its definitely a suspect and a very reasonable discussion point.

You know I think my battery issue may be due to this. 10 hours of light usage (mostly on standby) and my battery is down to 28%. But it didn't seem to drop as dramatically when I was away from home.
 
It's grayed out because your phone is ejected from iTunes. It's not a bug, it's a feature. I think you have a bug.

Of course it's eject from iTunes, your iPhone should eject itself when it's not connected to power. As soon as I disconnect it from power it disconnects, as it's supposed to.

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Anyway, fixed my problem, I suggest you people try a full factory restore, fixed the problem for me.
 
What the heck... my phone has been on the charger all night and reached 100% awhile ago; now it's still on the charger and the battery % is dropping. I haven't even taken it of the charger since it hit 100% and now it's at 96%. What the hell is going on?
 
Just adding my 2 cents..


Drove to work this morning starting on 100%. 1 hour later it was on 83%. Zero use. Handset was warm.

Checked the time zone thing. Looked like it was permanently on trying to find my gps location to make sure it had the right time zone. Turned that off.

Battery was still going down unacceptably fast but the handset wasn't warm any more.

Just deleted my email accounts, rebotoed and re-added them. I also enabled iCloud backup via wifi which was previously off. It wouldn't surprise me if theres something going on trying to run a backup or something to iCloud, because "why would you NOT use it?" so I'm wondering if turning it off was tested..

Anyway.. I'm going to see how I go but I've checked and other people in the business have 64GB 4s with no battery issues so its either faulty hardware, or a restoring issue from my 4/beta 5 build.

Dave
 
Is that just in standby?

If thats with useage as well?, thats great battery life

Standby. Mostly because when it finds a signal (3G here) it struggles to maintain it, so it probably transmitting at max power to poll for mail etc. Move it to the 2 foot wide window and it gets 2 bars and loses maybe 40% in that 12hrs. At home it's more like 2% in 12hrs, so signal strength makes a huge difference.

I noticed this in the past when changing from Optus to Telstra - Optus had 1 bar of signal in the house, 2 outside, and Telstra had full signal. My 3GS went from struggling to get through a day with no use to being plugged in at night with 75% or more change left and a few calls and SMS's done as well!

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Handset was warm.

Thats a big indication, as you noted, of the GPS running. Sounds like you have tried a few things, so maybe a clean install as a new Phone might be the better option?
 
So when I first updated all my devices to ios5 I had horrendous battery life. This is with an iPad 2, iPhone 4, and iPhone 4S

After trawling the Internet, I ended up turning OFF wifi sync
This has dramatically increased battery life on all these devices.

The iPhone 4 used to not be able to get through a whole day, now it finishes with approx 40% at the end of the day

The 4S is in a similar situation, but with a little less battery at the end of the day. I also had to re add all my exchange accounts on the 4S

This is coming from the 4S lasting about half a day after I first got it and had wifi sync on.

So YMMV but I reckon be sure to turn off wifi sync!

You mean you stopped it? Where do you turn it off?
 
Thats a big indication, as you noted, of the GPS running. Sounds like you have tried a few things, so maybe a clean install as a new Phone might be the better option?

Its an option but I would lose years of messages wouldn't I, so that would be quite an annoyance. I will monitor this thread and keep trying things but I've made a Genius Bar appt for Sunday just in case.

thanks
 
For all you guys with battery life issues
Is wifi sync turned off in iTunes?

To be clear, this only matters if iTunes is left running and you are in range of WIFI. iCloud may be the issue. I know when I first got the 4S my phone backed up to the cloud and got really hot in doing so.

Dont get the impression that is the issue here.

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If you are using IMAP, be sure you mail app is not getting stuck on one of the accounts.

I had this problem and it drained the battery pretty quickly. Also the IP4 got really hot.

Called my provider and they resync'd my mail. No problems since.
 
OK I just restored my iPhone as was using 100% -75% while asleep.Will see how it goes.
 
Everything cloudy enabled, got two push mail accounts, several reminders set.
After 10 hours of idling down to 96%
 
Its an option but I would lose years of messages wouldn't I, so that would be quite an annoyance. I will monitor this thread and keep trying things but I've made a Genius Bar appt for Sunday just in case.

thanks


Let us know what they say
 
Going from an iPhone 4 to the 4s I noticed immediately the difference in battery life. The 4s was worse.

Location Services Off
Bluetooth Off
Siri On
Wi-Fi Sync On
Push Mail On
ICloud Off

With the 4 I would lose a couple percentage points overnight.
The 4s drops 40-50%!

Trying some tests with a full charge today.
 
There is definitely something wrong with my battery.
I go to sleep @ midnight with about 90% battery (siri and bluetooth off, wi-fi on with good signal on wifi and Verizon ands wi-fi sync on). I wake up @ 6pm - phone dead and alarm I set for 6am wouldnt even ring (Blackberries were smart enough to shut down before battery dies and wake up again and sound the alarm...

Any suggestions?
 
I expect a software update from Apple soon.

There are too many people having issues for this to go un-noticed.
 
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