Need battery to discharge quickly - Tips?

Discussion in 'MacBook Pro' started by Melodeath, Apr 21, 2010.

  1. Melodeath macrumors 6502a

    Joined:
    Dec 9, 2009
    #1
    I'm trying to calibrate the battery of my new MBP. I need to get the battery to fully discharge and sleep for five hours or more. What are some things I can do to get my battery to discharge more quickly? Do I need to tell the MBP to not go to sleep after 10 mins of non-use, or the battery might last through the night? Or is it just the display that sleeps? I'd like to be able to use my MBP in the morning, but I'd like to make sure I get at least the recommended 5 hours of dead battery.

    Thanks
     
  2. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #2
    I just turn on Caffeine and leave the screen brightness turned all the way up. You could also put a video on repeat in iTunes.
     
  3. Melodeath thread starter macrumors 6502a

    Joined:
    Dec 9, 2009
    #3
    Thanks for that. Is it "dangerous" to leave Caffeine on though and have the MBP screen on (static) for over an hour with no screen saver?
     
  4. kousuke18 macrumors regular

    Joined:
    Aug 25, 2008
    #4
    Watch flash videos? :p

    On a more serious note, you can have two terminal windows open and run the following command: "yes > /dev/null" in both. CPU usage should spike to 100% and should drain the battery pretty quickly.
     
  5. Eleventeen macrumors newbie

    Joined:
    Jun 9, 2006
    #5
    Throw a bunch of movies into Handbrake.

    That or download and install Seti @ Home. Use your battery *and* search for ET.
     
  6. murdercitydevil macrumors 68000

    murdercitydevil

    Joined:
    Feb 23, 2010
    Location:
    california
    #6
    I just calibrated my battery today, and here's what I did (had to do it quickly because I was leaving the house).
    fired up movist with a playlist of a bunch of files.
    opened photoshop, word, powerpoint.
    opened itunes, let it play music in the background.
    opened firefox with several tabs, the active tab displaying the menu screen of onslaught 2 (flash)
    Ran vmware, did the same thing there (onslaught 2 flash)
    Turned off graphics switching
    screen brightness all the way up
    key backlight all the way up
    and for the final straw, opened Warcraft 3 and just let it sit there.

    The battery went from 100% to absolutely dead in about an hour and a half.
     
  7. tdream macrumors 65816

    Joined:
    Jan 15, 2009
    #7
    Hahaha, now this is real world usage :D
     
  8. Jimmi1321 macrumors newbie

    Joined:
    Jan 8, 2010
    Location:
    ITALY FVG
    #8
    When is the best time to start calibrating battery?

    As soon as you get the new mac
    or after a few day weeks normal usage?

    And in the second case do you have to let the battery drain?
    or you never have to let the battery drain?
     
  9. wandrer2 macrumors member

    Joined:
    Feb 9, 2010
    #9
    I played Tales of Monkey Island, full brightness screen, keyboard backlight maximal. About 90 minutes to empty.

    Oh, and unlike any Windows system I've seen, when I connected to power next morning, the game continued as if nothing happened!
     
  10. Chupa Chupa macrumors G5

    Chupa Chupa

    Joined:
    Jul 16, 2002
    #10
    1) Charge your battery to 100% when you get your machine then let it drain.

    2) Once you have calibrated it you can charge it whenever you like. The battery itself does not have "memory." You should recalibrate your battery every couple of months though. Apples says monthly, but seems like overkill to me.
     
  11. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #11
    Not at all, unless you have a custom screen installed that was built in the 1970s.
    If you read the instructions:
    You'll read:
    And you'll also see the detailed instructions for calibrating.
    That's NOT calibrating. Read the instructions for the correct way to calibrate.
     
  12. Eleventeen macrumors newbie

    Joined:
    Jun 9, 2006
    #12
    Windows *will* do this with hibernation enabled but it's typically not set up correctly by OEM's on new machines, and to my knowledge, not enabled by default on retail/corporate installs of Windows. My disclaimer is that I haven't worked with Windows 7 installs that much yet, they could have changed this behavior.
     
  13. anarchron macrumors member

    Joined:
    Aug 7, 2004
    #13
    open up 4 tabs in terminal and type this in to each of them:

    yes > /dev/null
     
  14. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #14
    That only puts a load on the CPU. If you add a load on the GPU (video), the optical drive and add activity on bus-powered drives, you'll drain it much faster.
     
  15. murdercitydevil macrumors 68000

    murdercitydevil

    Joined:
    Feb 23, 2010
    Location:
    california
    #15
    same thing here, I was really impressed with that feature. Seems like a no-brainer, but only on a Mac have I seen this.
     
  16. admiraldennis macrumors regular

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    Aug 19, 2002
    Location:
    Boston, MA
  17. Ferry macrumors newbie

    Joined:
    Aug 18, 2013
    #17
    Reviving an old thread, but I just replaced my MBP 15" mid-2009 battery, and I was looking for instructions on how to recalibrate it.

    Looks like Apple has changed its mind since then. Now it recommends NOT to recalibrate MBP mid-2009 and other models batteries. Previous page has dissappeared and now in this one


    you can read:

    Any explanation for this change?

    Saluditos,

    Ferrán.
     
  18. Atomic Walrus macrumors 6502a

    Joined:
    Sep 24, 2012
    #18
    I'd speculate that the real reason for this change is that it was always a bad idea. The worst thing you can do to a lithium battery is drain it completely and let it stay that way.

    I can't think that any small improvements in battery measurement accuracy are worth the impact following these procedures on a regular basis would have on the battery's lifespan.
     
  19. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #19
    Apple didn't change its mind. User-removable batteries in older Apple notebooks should be calibrated. Apple likely removed the link because most notebooks in use today are likely to be the unibody models. Removal of the link doesn't change the fact that calibration still applies to those older models.

    The built-in batteries in the newer Mac unibody notebooks come pre-calibrated and do not require regular calibration like the removable batteries in older Apple notebooks.

    Remember that calibration only serves to keep battery readings more accurate, and does not improve or extend battery life.
    The link below should answer most, if not all, of your battery/charging questions. If you haven't already done so, I highly recommend you take the time to read it.
     
  20. laserbeam273 macrumors 6502

    Joined:
    Sep 7, 2010
    Location:
    Australia
    #20
    Geekbench Stress Test and Cinebench? That's a bad day for your battery charge!
     
  21. Ferry macrumors newbie

    Joined:
    Aug 18, 2013
    #21
    Hummm… That doesn't seem to match with what you said in your previous post, where you were quoting from that page

    in an answer to Melodeath, and his original post is dated back in April 2010 -OSX v10.6 was the only available then, v10.7 was not available until Aug 2010-. The only page available then was that one, as a v10.6 Help page, and I know because I have been following these very directives myself -I own a mid-2009 MBP-. And the page has been active until June 2012, according to Internet Archive.

    So, yes, it looks like Apple has changed its mind, and I would like to know why, if there's any technical reason.

    Saluditos,

    Ferrán.
     
  22. SCOLANATOR macrumors 6502a

    SCOLANATOR

    Joined:
    Jul 3, 2013
    Location:
    UK
    #22
    Take the bottom cover off, find an insulated piece of copper cable of about 12AWG, locate the anode and cathode, have fun sparking away.
    ;-)

    As a number of people mentioned previously I don't believe you really need to calibrate, although I imagine it's a good idea on first use to fully charge the battery.
     
  23. Ferry macrumors newbie

    Joined:
    Aug 18, 2013
    #23
    ADDENDUM: Found it!

    The link you can find in the FAQ you linked to, the same link I posted, is:

    http://support.apple.com/kb/HT1490

    You can find what it said back in July 22th 2011. It was changed just a week later -check dates in the documents themselves-. So yes, Apple changed its mind. Does that means that I have been mistreating my battery all these years, following what I thought were correct Apple directives?

    Saluditos,

    Ferrán.
     
  24. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #24
    If you have an Apple notebook with a built-in battery, you do not need to calibrate that battery. If you have been calibrating it in the past, you can stop doing so. You haven't damaged your battery by calibrating it, but it is unnecessary for built-in batteries. Calibration only affects the accuracy of the battery readings, and not the battery health.
     
  25. Ferry macrumors newbie

    Joined:
    Aug 18, 2013
    #25
    Thanks for the info. Anyway, any idea on why they changed those directives?

    Saluditos,

    Ferrán.
     

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