Very Interesting Battery-Life Issue

Discussion in 'iPhone Tips, Help and Troubleshooting' started by CBJammin103, Aug 16, 2007.

  1. CBJammin103 macrumors regular


    Jun 6, 2007
    Louisiana, United States
    I work at a hospital; typically during the work day, there are between 5 and 10 stories of concrete, electrical equiptment, and medical instruments between me and the open sky. As my hospital doesn't specifically support ATT, I have no cell-phone service in the large majority of the hospital.

    When I first started using my iPhone at work (just leaving it on standby with the occasional wifi checkup on the 'net) I was getting [what I consider to be] terrible battery life. Just leaving the phone on standby and using it for non-'net things and a rare glance at the internet would have the battery at 15%-20% after the work day or so, which is anywhere from 8 to 10 hours.

    "Okay," I thought, "It's just how the phone works."

    Well, I decided to give something a test. I put the phone on airplane mode during the work day and used wifi for 'net access more than I typically did. The battery didn't budge throughout the whole day! So it seems that it was the "phone" part of the iPhone that was draining the battery. Strange...

    Also, to note, now that I'm in a bit of off-time and have used the phone away from work more, it seems that only in my workplace does the phone's battery life suffer as described.

    I can't give any specific usage numbers at this point, but is it possible that either the prolonged lack of cell-phone signal or something in the hospital's equipment was pushing my iPhone to use significantly more battery than normal?
  2. thejadedmonkey macrumors 604


    May 28, 2005
    It's using the radio at max power trying to find a signal, which drains the battery faster. I'm pretty sure all phones work like this.
  3. KD7IWP macrumors 6502a


    Mar 8, 2004
    American living in Canada
    Yes, when PCS phones came out I remember hearing that they were one of the first phones to vary their radio tower by determining how far away they were. And so your iPhone is struggling to remain in contact with a tower.
  4. Speedracer04 macrumors 6502a


    Sep 8, 2006
    When the phone has little or no service it drains the battery much faster due to it trying to aquire a signal all the time. I dont know if this is the exact reason why, but I have had cingular/att for 7 years now and it has always been like that.

    No signal=no battery life :(
  5. ashVID macrumors regular

    Jun 30, 2007
    Put it in flight mode or turn it off when you are not using it...

    ash =o)
  6. CBJammin103 thread starter macrumors regular


    Jun 6, 2007
    Louisiana, United States
    I thought as much... could this possibly be the answer to the "battery woes" of some iPhone users? Using the phone in a place where wifi, but not cell-tower signal, is available?

    Vo-ip would be the best solution, perhaps. Never used it, but it seems that a vo-ip offering directly from ATT would be perfect. If would use your plan's minutes but give you cell-phone capability in hotspots that didn't get cell-phone signal from ATT.

    For now, I'm just going to put it in flight mode when I know I won't be able to get any signal.

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