Why does setting up as a new phone improve battery dramatically?

Discussion in 'iPhone' started by MoodyM, Dec 26, 2011.

  1. MoodyM macrumors 6502a

    MoodyM

    Joined:
    Aug 14, 2008
    #1
    I've had an iPhone 4 since day 1. Three times now since I got it my battery life suddenly became so bad I had to restore and set up as a new phone (not restore from backup). All 3 times this has fixed my battery issues.

    In all 3 cases my battery life became horrendous (fully charged at 8am, less than half by 1pm, warnings by 5pm). What's more weird is that in all 3 cases it happened suddenly, with no recent install of new apps, etc, that I can recall - one day the battery was pretty decent (for an 18 month old phone with bluetooth and WiFi constantly on), the next day it was horrific.

    Although it's a HUGE pain in the ass to restore as new phone (lose all folders, settings, save games, etc), I can live with it; that's not the point of my post here. The point is I'm purely curious as to WHY my battery life very suddenly deteriorates and WHY does restoring as new phone fix it?

    Thanks
     
  2. Applejuiced macrumors Westmere

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
    #2
    Same here.
    My 4S is restored from an old i4 backup.
    Used it a little today for some browsing and email, half day 56% left.
    My wife's setup as new, used it half day probably more than me for facebook and email 91% :eek:
    Big difference, when the next update 5.1 comes out Im setting up as new.
     
  3. MoodyM thread starter macrumors 6502a

    MoodyM

    Joined:
    Aug 14, 2008
    #3
    Like I said, it IS a huge PITA, but worth it. I would just love to know WHY it happens.

    Another thing I did notice - during the periods my battery was poor, I noticed my iPhone 4 was getting quite hot. Since I restored as new, the battery is fine and the iPhone isn't heating up at all...
     
  4. Applejuiced macrumors Westmere

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
    #4
    Weird for sure.
    I hope once I setup as new the battery life will stay decent.
    I dont feel like doing that every few weeks.
     
  5. MoodyM thread starter macrumors 6502a

    MoodyM

    Joined:
    Aug 14, 2008
    #5
    To be fair it's only been 3 times in 18 months, but it's still a huge pain to lose all save games, etc.
     
  6. Calidude macrumors 68000

    Calidude

    Joined:
    Jun 22, 2010
    #6
    It's because Apple backs up too much in an effort to make it foolproof for people but this data somehow causes settings to be messed up when restored to a phone.

    Apple needs to do a minimal backup instead of assuming their users are brain-dead.
     
  7. PNutts macrumors 601

    PNutts

    Joined:
    Jul 24, 2008
    Location:
    Pacific Northwest, US
    #7
    Lost me there.
     
  8. Small White Car macrumors G4

    Small White Car

    Joined:
    Aug 29, 2006
    Location:
    Washington DC
    #8
    What didn't make sense about it?
     
  9. sbailey4, Dec 26, 2011
    Last edited: Dec 26, 2011

    sbailey4 macrumors 68030

    sbailey4

    Joined:
    Dec 5, 2011
    Location:
    USA
    #9
    One thing you guys may want to try is just the settings>general>reset>"Reset all settings" option. Then when it reboots setup as new phone. Run through the wizard bit do not restore from backup. All your apps and data will remain using this method when finished and it does solve the battery issue (well has for a lot of folks). All you have to set back up is any wifi and the email signature few items like that but data and apps are good to go

    As to why, well apparently some wifi settings and other settings get hung in some state that keeps them running constantly and resetting the settings unhangs them. At least what I have heard,read somewhere
     
  10. takeshi74 macrumors 601

    Joined:
    Feb 9, 2011
    #10
    Nowhere near enough info to conclude that this is causal rather than coincidental. Setting it up as new is the equivalent of power cycling or formatting and reinstalling. It may help to address the symptom but there could be any of a number of causes.
     
  11. hel22 macrumors member

    Joined:
    Oct 6, 2010
    #11
    One thing you guys may want to try is just the settings>general>reset>"Reset all settings" option. Then when it reboots setup as new phone. Run through the wizard bit do not restore from backup. All your apps and data will remain using this method when finished and it does solve the battery issue (well has for a lot of folks). All you have to set back up is any wifi and the email signature few items like that but data and apps are good to go

    If you set it up as a new iphone, how do all the apps and the rest stay on it??
     
  12. mms13 macrumors 6502

    Joined:
    Jun 29, 2010
    Location:
    Baltimore, MD
    #12
    I'm not convinced setting up as new makes it any better. I've gone from an iPhone 3G to an iPhone 4 to an iPhone 4S and have ALWAYS restored from a backup. And while my 4S battery life isn't as good as on the iPhone 4, I'm pretty sure it's on par with most people (about 6-7 hours of usage time).

    Like the poster above me said, I don't think it's anything other than coincidence.
     
  13. Stealthipad macrumors 68040

    Stealthipad

    Joined:
    Apr 30, 2010
    #13
    It has not been proved that it help battery life. I did not set mine up as a new phone and the battery lasts all day and then some.

    Do not believe all you read here.
     
  14. VydorScope macrumors regular

    VydorScope

    Joined:
    Oct 12, 2011
    #14
    Some subset of the people with the problem claim it fixed/helped their battery problem, so either they are all liars, or it does help some subset of the cases. If it does help some subset of the cases, then its worth a shot since its a safe thing to try.

    I do not have a battery problem, so can not speak beyond that.

    Why it could work? Some setting that is bugged, a bad install of some app/apps, etc. Plenty of random guessable options for the cause.
     
  15. wordoflife macrumors 604

    wordoflife

    Joined:
    Jul 6, 2009
    #15
    I restored from a backup of my 3GS to my 4S and battery life is okay.
    [​IMG]

    Could be better, but at least I'm not draining in 4 hours.

    Lose about 3% overnight (7-8 hours)
     
  16. tarasis macrumors 6502a

    tarasis

    Joined:
    Oct 26, 2007
    Location:
    Here, there and everywhere
    #16
    Because it stops what might be an errant process. Since 19/12 I have had horrid battery problems with the 4S because the phone doesn't appear to properly go to sleep. Energy diagnostics seem to back this up as they show the phone is Wake mode and logs indicate that a particular process is preventing the system sleeping.

    I've seen a similar thing before on the 3GS and the 4 so it def seems OS related. Though I haven't seen the bug in a long old while.
     

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