How much does screen brightness affects battery life?

Discussion in 'iPhone' started by HarryPot, Sep 24, 2010.

  1. HarryPot macrumors 6502a

    Sep 5, 2009
    I really like having my iPhone between 80-90% of screen brightness, but I'm concerned about battery life.

    How much battery life difference are we talking about between using the iPhone at 50% or at 90%, approximately?
  2. samcraig macrumors P6

    Jun 22, 2009
    80-90? WOW. That just about burns my retinas. I have mine at 35-40 percent and consider it PLENTY bright...
  3. mpossoff macrumors 68020

    Mar 21, 2010
    Apple at genius bar said to keep brightness a hair below 50% cause screen brightness is a battery killer.

  4. HarryPot thread starter macrumors 6502a

    Sep 5, 2009

    I can perfectly read at 35-40%, but at 80-90% I simply enjoy it more.

    So I have heard, but I have never seen any actual numbers. I guess I'll have to make some benchmarks myself. Problem is, I don't see myself with much time to make them.:eek:
  5. IrishVixen macrumors 68020


    Jun 20, 2010
    Screen brightness at or near full is the single largest battery hog on my phone, worse than push or weak 3G signals. The only time I leave my screen anywhere near full brightness is when I'm outside--most typically in the car. With the iPod app playing and Bluetooth on, I can literally watch the battery drop by 1% every 2-3 minutes or so--it's bad enough that I've gotten into the habit of plugging the phone in as soon as I get into the car unless it's a really short drive. Using the iPod app and Bluetooth indoors, with the screen around 30%, it takes a lot longer to see a measurable dip in battery life.
  6. Resist macrumors 68030

    Jan 15, 2008
    While this is true, 50% is not enough for normal use during the least not for me.
  7. -aggie- macrumors P6


    Jun 19, 2009
    Where bunnies are welcome.
    If you want to know the answer to this, OP, just test your battery life at 100% and see how long it takes to go down a few % and then do the same for 50%
  8. rk1991 macrumors regular

    Dec 10, 2009
    why dont you just leave it at fifty and use auto brightness..i feel that helps quite a bit.
  9. slayer41 macrumors newbie

    Aug 1, 2010
    I keep mine right under the second s in brightness. And I have auto bridghtness on. I easily can go a whole day without charging my battery.
  10. ucfgrad93 macrumors P6


    Aug 17, 2007
    I keep mine around 75% and usually don't have a problem lasting an entire day.

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