having poor 3GS battery life? Glitches? I may have the fix

Discussion in 'iPhone' started by Offshore1, Jun 27, 2009.

  1. Offshore1 macrumors regular


    Jun 24, 2009
    Like some of you I was having my 3GS battery drain much faster than my 3G. I took the phone to the Apple store and they checked something and swapped my phone for a new one. I charged the new phone up overnight. Battery seemed "a little better"
    Was using it some and by chance went into the usage menu and this was displayed:

    "Time since last full charge"
    Usage -
    Stand by -

    it shows no time, just a dash in each spot. The 1st 3GS phone that I swapped did that too. I was also getting calls, but the front caller ID screen was intermittently black, so I'd have to hit the home button to bring up the screen so I could answer the phone.
    It was odd that the 2nd phone had same 3 issues as first phone. Being in electronics, the chances of exact same problem in 2 devices that are pretty slim.

    Here is what I found out (in plain English) after speaking to Apple tech on the phone: They are finding out that sometimes if you set your new 3GS phone up from the back up from a 3G phone; something is fouling up the new phone.
    He had me restore, then set up the 3GS as a new phone. Took a bit to do, but not bad. I now have "Time since last full charge" usage & stand by readings - the battery meter stayed on full all last night, and I used it quite a bit. Before, it would have been around 70 - 80%. All calls have had caller ID working.

    Those of you having issues my want to try this. So far it has seemed to work for me. Hope it does for you too!
  2. MBHockey macrumors 68040


    Oct 4, 2003
    New York
    The dash comes up instead of usage time when you have had to force a reboot, or some other abnormal interruption occurs. But if you were never able to see usage time, then yeah, something's probably wrong.

    I resorted to the "restore and set up as new phone" method because I was convinced there was some rogue process sucking up juice. I will see today how long it lasts, but i'm not optimistic. my iPhone 3G got easily twice the battery life of this one.
  3. BullittMustang macrumors 6502a

    Mar 27, 2008
    Have you made sure to close all open windows in Safari before you close the Safari app? That was draining my battery. For some reason it keeps running even after you close Safari if you leave a tab open.
  4. uhhitsjames macrumors member

    Dec 30, 2007
    Boston, MA
    I've got the same problem with the screen going black when I have an incoming call, but I set up mine as a new phone from the beginning. I'll have to bring it into apple soon and see what the deal is.

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