Q: iPhone 4s Battery Life?

Well, it worked for my iPhone 4s, so I thought I'd share and see if it works for anyone else. 

Hi srjervis,

I am closing all the applications after using them so that they do not remain functioning and drain battery. I think one of the reasons may also be the location services being activated in most of apps. I have closed the same for the moment. Lets see if it helps

Yep, it's been covered every couple of pages for the last 700 or so. It's not a bad thing to close any apps that show in the most-recently-used list, but its not accurate to say they're all running. What state the app goes into in the background depends how the writer set it. There's details at

https://developer.apple.com/library/ios/#DOCUMENTATION/iPhone/Conceptual/iPhoneO SProgrammingGuide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.h

If you have apps that are actually running in the background and you'd rather it didn't, let the writer know if probably the best thing.

rphunte42 wrote:

 

ricky_tang wrote:

 

The compass calibration is also used by the Maps application. I don't know what effect turning this off will be.

 

The compass calibration process uses the GPS to determine the correct correction values for the compass based on where GPS says you are, and displays the map so you can verify that position.  It only uses the GPS for the calibration operation, and to verify your location, so battery use should be minimal.  The calibration allows a 'true north' reading by compensating for the difference between the magnetic north pole and the pole determined by the earth's rotation, and this offset varies depending on your location.  All of which is important ONLY if you intend to use the compass for acutal navigation, such as in an aircraft.  Tramping through the woods on foot really doesn't need this kind of accuracy.

rphunte42 still gives dangerous and wrong tips, don't follow!

The difference between magnetic and geographic pole, called http://en.wikipedia.org/wiki/Magnetic_declination it is given by itself, not/never by earth rotation.

If you are in the woods and use only the compass without calibration, let's say only 1 degree difference, you will miss your target after one mile by 30 yards, after two miles 60 yards and so on, anyway this could be crucial.

<Edited by Host>

Tamarillo wrote:

 

rphunte42 wrote:

 

ricky_tang wrote:

 

The compass calibration is also used by the Maps application. I don't know what effect turning this off will be.

 

The compass calibration process uses the GPS to determine the correct correction values for the compass based on where GPS says you are, and displays the map so you can verify that position.  It only uses the GPS for the calibration operation, and to verify your location, so battery use should be minimal.  The calibration allows a 'true north' reading by compensating for the difference between the magnetic north pole and the pole determined by the earth's rotation, and this offset varies depending on your location.  All of which is important ONLY if you intend to use the compass for acutal navigation, such as in an aircraft.  Tramping through the woods on foot really doesn't need this kind of accuracy.

rphunte42 still gives dangerous and wrong tips, don't follow!

The difference between magnetic and geographic pole, called http://en.wikipedia.org/wiki/Magnetic_declination it is given by itself, not/never by earth rotation.

 

If you are in the woods and use only the compass without calibration, let's say only 1 degree difference, you will miss your target after one mile by 30 yards, after two miles 60 yards and so on, anyway this could be crucial.

 

OMG, idiocy knows no end!

It is obvious that your ignorance of navigation, both practical, and theoretical, exceeds my expectations.  Research your facts before you call someone an idiot.  If you compass is used for the initial reading, even if you go in the direction that would yeild the maximum error, then you would be fine after a mile, or 50 miles.  Only in cases of long distances do these differences really matter.  You location on the earth certainly does matter to the value of the correction needed.  If you happen to be in the right place, the magnetic north and polar north (point at which the earth's rotation is centered on), then there is no correction needed. 

Ok here is the problem. I have a iPhone 4s since launch. I used to have normal usage and standby times, like 5-6 hours usage and 1 day standby. Then my phone started losing like 10% per hour and my usage time nearly doubled!

[IMG]http://i713.photobucket.com/albums/ww136/glympe/b0810753.jpg[/IMG]

I did a hard reset, reset all settings and finally TWICE erase all setting and wipe phone, set up as new and my battery life got normal again.

Here is the strange part. Since then, Asa long as my pone is on, the battery life is fine. If I restart my phone, or battery dies or put airplane mode on, the phantom usage starts again and I have to erase phone and set up as new to fix it.

Now I'm on 7 dAys with my phone constant on and I have like 0.5 to 1% drain per hour which is nice.

Anyone can explain this bizzare bug?

That is bizzare, but now your battery is fine.  I cannot explain how what I did worked because now, my battery life is great.  Last night, I had Facebook open and WiFi on for 30 minutes and the battery percentage stayed the same for 25 minutes, and it only droped 1% after that.  I charged it last night to 100% and I've had it on for an hour today, mostly on standby and checking my calendar for a few minutes.  It is still at 100%.  Explain that?  I say what I did fixed the problem, don't know how, but it did.

The battery discharge from a li ion battery is non linear.....

Apart from that iPhone 4S battery always takes a while to drop from 100 to 99. It will stay on 100 for a long time...for some 4S, it stays on hundred for about 4 hrs standby and for some for about 6 hrs standby....Once it drops to 99, you can notice almost a linear drop until 20 percent....It drops pretty quickly after 20 percent....

I myself had a 4S that took 5 hrs to drop from 100 to 99. I had to exchange that cos it never matched the specs during audio, video and call....The new 4S that I have, it takes about 3 to 4 hrs on on standby to drop to 99 from 100 and from 99 it takes 2 hrs 15 minutes to 2 hrs 30 minutes on an average to lose a percent....While on usage, I generally get 45 to 50 minutes of non network usage before the mobile drops from 100 to 99 and about 25 minutes if I connect it to the net via wifi....

Its pretty common with all the 4S....

And believe me, I had my friends Galaxy S2 in my hand yesterday, the next best thing in the market after 4S (though i see S2 as a zilch in front of 4S), the phone loses its juice at super sonic if you use any network related options....

then what's the difference between the soft reset method (pressing Home and Sleep button at the same time to reset the phone) and pressing the home button twice to close all the apps manually? aren't they the same?

Pavan Kulkarni wrote:

 

It resets iPhone terminating any background application. It is something similar to what you do with a pin on an mp3 player by inserting the pin into the reset hole... You'll know if you have had an mp3 player apart from iPod with you... Basically terminates any application including that are not accessible by the user...

Pavan Kulkarni wrote:

 

The battery discharge from a li ion battery is non linear.....

Apart from that iPhone 4S battery always takes a while to drop from 100 to 99. It will stay on 100 for a long time...for some 4S, it stays on hundred for about 4 hrs standby and for some for about 6 hrs standby....Once it drops to 99, you can notice almost a linear drop until 20 percent....It drops pretty quickly after 20 percent....

I myself had a 4S that took 5 hrs to drop from 100 to 99. I had to exchange that cos it never matched the specs during audio, video and call....The new 4S that I have, it takes about 3 to 4 hrs on on standby to drop to 99 from 100 and from 99 it takes 2 hrs 15 minutes to 2 hrs 30 minutes on an average to lose a percent....While on usage, I generally get 45 to 50 minutes of non network usage before the mobile drops from 100 to 99 and about 25 minutes if I connect it to the net via wifi....

Its pretty common with all the 4S....

I noticed the same thing on my 4s, it takes 2-3 hours to drop 1% with a few brief calls and mostly standby, then it drops 2-4% in a mush shorter period 2-3 hours with the same activities. 

bestco wrote:

 

then what's the difference between the soft reset method (pressing Home and Sleep button at the same time to reset the phone) and pressing the home button twice to close all the apps manually? aren't they the same?

Pavan Kulkarni wrote:

 

It resets iPhone terminating any background application. It is something similar to what you do with a pin on an mp3 player by inserting the pin into the reset hole... You'll know if you have had an mp3 player apart from iPod with you... Basically terminates any application including that are not accessible by the user...

If you hold the sleep and home buttons until you see the Apple logo appear, you have done what amounts to a cold reboot on your computer.  The phone ends all the apps, all the internal programs that run all the time, (30 or so of them depending on your settings), and clears the RAM.  It then reloads everything, just like your desktop computer being rebooted after being turned off. 

Using the sleep and home buttons this way will also cause the phone to reregister itself with your network, and reload tower information.  My wife does this every day or so with her 3GS, and I do it about once a week on the 4S.  If you will check, the normal 'power off' process doesn't even get rid of your 'last used apps' list.  It is just a sleep mode that turns off the radios, and suspends all operations, but retains your last status.

Agree!!!....Much clear explanation, anyway is there an appplication on the App Store that I could use to see the processes running and shows the CPU usage everytime I touch the screen or do something with the phone....

Hi everyone! Just wanted to share my opinion...

I have an iPhone 4S and my boyfriend has an Android phone, so I couldn't help but compare.

Of course, I have this battery drain problem. My phone drains 10-15% battery per hour on standby. It became even more depressing when I saw the huge difference in battery life between the iPhone and the Android. The worst thing was, the Android had ALL its features on, the iPhone's features were all off.

The battery life problem on the iPhone has been dragging on for far too long and without any update from Apple. I thought I was willing to wait for the next software update that might fix it. But I realized... I paid huge bucks for a phone that barely makes it through the day, with awesome but expensive features that I can't use because it kills the battery, no 3G toggle, no file transfer through Bluetooth, very restrictive software, iTunes that frequently crashes my computer...

I have observed it myself - that Android phone was simply better, cheaper, more user-friendly and more efficient. I've learned the hard way not to give in to the iPhone hype, now I know better

So I am returning my iPhone and buying an Android phone tomorrow

Just my opinion

Duckgirl722 wrote:

 

Hi everyone! Just wanted to share my opinion...

 

I have an iPhone 4S and my boyfriend has an Android phone, so I couldn't help but compare.

 

Of course, I have this battery drain problem. My phone drains 10-15% battery per hour on standby. It became even more depressing when I saw the huge difference in battery life between the iPhone and the Android. The worst thing was, the Android had ALL its features on, the iPhone's features were all off.

 

The battery life problem on the iPhone has been dragging on for far too long and without any update from Apple. I thought I was willing to wait for the next software update that might fix it. But I realized... I paid huge bucks for a phone that barely makes it through the day, with awesome but expensive features that I can't use because it kills the battery, no 3G toggle, no file transfer through Bluetooth, very restrictive software, iTunes that frequently crashes my computer...

 

I have observed it myself - that Android phone was simply better, cheaper, more user-friendly and more efficient. I've learned the hard way not to give in to the iPhone hype, now I know better

 

So I am returning my iPhone and buying an Android phone tomorrow

 

Just my opinion

Whatever floats your boat.  Just a hint, the biggest complaint among users of current Android phones is short battery life.  You may be jumping from the frying pan into the fire.

Pavan Kulkarni wrote:

 

Agree!!!....Much clear explanation, anyway is there an appplication on the App Store that I could use to see the processes running and shows the CPU usage everytime I touch the screen or do something with the phone....

There are several apps that do something like you want, and many of them are free.  Just go to utilities and look for 'system status' apps.