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Poor battery life with iPhone 3G running 3.1.2

6147 Views 15 Replies Latest reply: Jan 16, 2010 5:39 PM by iphone3Gguy RSS
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chrisstclair Level 1 Level 1 (0 points)
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Jan 14, 2010 12:39 PM
Hi, I have an iPhone 3G which I bought brand new from O2 last July, and I've noticed that over the last few months my battery life has gone awful, especially with the 3.1.2 OS version.

An example is that I fully charged my iPhone 1 hour and 30 mins ago. For the first hour and 15 minutes, all I did was listen to the iPod for a bit, with the EQ off and the screen on about 30% brightness (when I needed to use it). For the remaining 15 minutes I watched 2 YouTube videos, again with the brightness low. In that time, my battery drained to under half!

My friend uses his iPhone about the same as me, and he charges his every 2 days - I have to charge mine TWICE a day! He usually has the same settings as me - 3G usually constantly on, BlueTooth 99% of the time off, and WiFi off when out & ab out.

I've tried restoring many times, but the problem still exists. If I take it to the Genius Bar, will they repair/replace it, and how long do you guys think the process would take?

Thanks
iPhone 3G, iPhone OS 3.1.2
  • Lawrence Finch Level 7 Level 7 (24,530 points)
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    Jan 14, 2010 12:44 PM (in response to chrisstclair)
    What are the differences between your phone and your friends? How is email retrieve set (Push, Fetch, Manual)? Have you recalibrated the battery gauge within the past month? What apps do you have that use Notifications? Have you closed all Safari pages not in use?
    Lenovo T-60, Intel iMac , Dell/Ubuntu 8, iPhone 3GS 3.1, Windows XP Pro, Leopard 10.5.4
  • Allan Sampson Level 10 Level 10 (122,150 points)
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    Jan 14, 2010 12:49 PM (in response to chrisstclair)
    Difficult to compare iPhone usage with someone else over a 2 day period unless you live with and go everywhere with the person, have identical 3rd party apps installed, and access and use everything the same during that time.

    I've tried restoring many times, but the problem still exists.


    From your iPhone's backup and as a new iPhone or not from your iPhone's backup?

    If I take it to the Genius Bar, will they repair/replace it, and how long do you guys think the process would take?


    If it is determined there is a hardware problem with your iPhone at the Apple store, your iPhone remains under warranty, there has been nothing done that would void the warranty and nothing else that can be done besides exchanging your iPhone under warranty, it will be exchanged under warranty on the spot.
     MacBook Pro 15" Intel Core 2 Duo/2.53GHz/4GB RAM/500GB HD, Mac OS X (10.6.2),  iPod w/Video 30GB,  iPhone 3G 16GB
  • paulcb Level 6 Level 6 (18,680 points)
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    Jan 14, 2010 1:03 PM (in response to chrisstclair)
    If your battery life problem still exists after restoring as a new phone and not adding any third party apps, the next step is to make and appointment at the Genius Bar.
    HP DV7 Laptop (nice but don't like Vista), Windows Vista, iPhone 3G 8GB with 3.12
  • Allan Sampson Level 10 Level 10 (122,150 points)
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    Jan 14, 2010 1:20 PM (in response to chrisstclair)
    Using similar applications that require internet access for the same period of time when connected to an available wi-fi network, or when connected to the internet via 3G? If the latter, what was his cellular reception at the time compared to yours when doing the same for an identical period of time, etc.? There are a number of factors which can affect battery life which may or may not be the same during the course of a day when comparing battery life between the same iPhone models was my point.

    On my most recent restore, I deleted all my backups and set it up as a new iPhone, and the problem is still the same.


    No need to delete an iPhone backup or all iPhone backups if there is more than one available when restoring your iPhone with iTunes as a new iPhone or not from your iPhone's backup, which must be manually selected when doing a restore with each option being a separate process.

    If no change after restoring your iPhone with iTunes as a new iPhone or not from your iPhone's backup, you can and should make an appointment at an Apple store if there is one nearby.
     MacBook Pro 15" Intel Core 2 Duo/2.53GHz/4GB RAM/500GB HD, Mac OS X (10.6.2),  iPod w/Video 30GB,  iPhone 3G 16GB
  • Lawrence Finch Level 7 Level 7 (24,530 points)
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    Jan 14, 2010 3:03 PM (in response to chrisstclair)
    Yes, you recalibrated it correctly. If you use Push email go into Settings/Mail,Contacts & Calendar, open the Push account and turn it off. The reboot the phone (hold HOME and SLEEP until a Apple logo appears, ignoring the "Slide to Power Off" message). After the phone completes rebooting go back into settings and turn Push back on.

    Note that your battery life will vary with the number of email Push notifications you get and the number of emails you receive. I charge my phone overnight. On a weekday I am between 20% and 40% by the end of the day. On a weekend when I get very little Push email I am at 80%.
    Lenovo T-60, Intel iMac , Dell/Ubuntu 8, iPhone 3GS 3.1, Windows XP Pro, Leopard 10.5.4
  • iphone3Gguy Level 3 Level 3 (565 points)
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    Jan 14, 2010 3:52 PM (in response to chrisstclair)
    Chris7197,

    It is highly unlikely that it is your settings IMHO. Having to charge your iPhone twice a day should not really happen. If you were using a battery intensive application several hours straight or something but you are not. I would recommend an appointment at the Apple Store to have a genius diagnose it to find out if it is a battery issue covered under your warranty.
     iMac, Mac OS X (10.6.2),  iPhone 3GS
  • Allan Sampson Level 10 Level 10 (122,150 points)
    Currently Being Moderated
    Jan 15, 2010 4:42 AM (in response to chrisstclair)
    Another question though, I have the Zagg InvisibleShield on my phone, which if I remove I can't apply it again - will I have to buy a new one, or would Apple cover the cost?


    Apple will not cover the cost for this - you will have to buy a new one if you want the same on the exchange.
     MacBook Pro 15" Intel Core 2 Duo/2.53GHz/4GB RAM/500GB HD, Mac OS X (10.6.2),  iPod w/Video 30GB,  iPhone 3G 16GB
  • Sean Frazier Level 2 Level 2 (205 points)
    Currently Being Moderated
    Jan 15, 2010 5:09 AM (in response to chrisstclair)
    Chris,

    I had the exact same problem and tried the same solutions. In the end i install the System Activity Monitor App (http://itunes.apple.com/us/app/system-activity-monitor-3gs-update/id306192663?mt =8) and it showed that my Cisco VPN was consuming lots of CPU, all the time. I removed the profile for the VPN and voila! I now get normal usage, meaning i can now go a whole day without a recharge.

    The VPN thing might not be your issue, but the Activity Monitor app might give you some clues. it's 3 bucks but for me worth every penny. i just wish Apple would have had such an app by default.

    hope this helps. good luck!

    - sean
    MacBook Pro 2.6ghz, iPhone OS 3.1.2, 32g iPhone 3GS
  • Abers Level 1 Level 1 (0 points)
    Currently Being Moderated
    Jan 15, 2010 10:18 AM (in response to chrisstclair)
    I found that my phone battery life was drastically reduced as soon as I installed an app that offered push notifications. I installed Real Soccer 2010 and even though all the push notifications were turned off the battery life sucked. The latest release of Facebook app also now has push notifications.

    I deleted the apps and restored the iPhone to Factory settings and the battery life is back to being as good as new. I winder if the deactivation of push notifications REALLY deactivates them or just stops the phone displaying them? I'll use that activity app that someone mentioed to do some debugging.

    I'm running on 3.1.2 with a 3G 8Gb and iTunes 9
    MacBook (Intel), 2 CoreDuo 1 RAM, Mac OS X (10.4.11), Sony HDR-SR11, Canon SD550
  • iphone3Gguy Level 3 Level 3 (565 points)
    Currently Being Moderated
    Jan 15, 2010 2:03 PM (in response to Sean Frazier)
    seanf,

    Thanks for sharing. I did not know about the app. Very cool tool indeed. I am glad it helped you focus in on the problem causing the battery drain.
     iMac, Mac OS X (10.6.2),  iPhone 3GS
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