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  • weeasle Level 1 Level 1

    Have you tried running a full cycle? Also many may not be aware that for macbook airs there is an inbuilt battery calibration procedure that can recover substantial batter life estimation (particularly on older macs that have not been cycled properly as per Apples recommendations  for lithium polymer batteries)

    You can confirm what I am saying by searching Apple Support - Battery Usage Guidelines and Battery Callibration Procedure.


    Here is a quick summary of the procedure:


    * Charge to 100%


    * Disconnect and run on battery until macbook shuts itself off (do not shutdown - allow macbook to sleep itself from drained battery)


    * With battery drained leave unplugged (no mains power) for at least 2 hours - I like to allow 3-6..


    * After at least 2 hours reconnect magsafe to mains power with macbook still off allow full charge until magsafe LED turns green (best not to use while charging)


    * Allow macbook to stay on magsafe adapter without use for another 2hrs


    The above procedure is from memory and you are best to consult an apple search to view the help document online but that procedure recovered substantial amounts of runtime for my MBA.


    Also adter running an inbuilt calibration, please try running your macbook a full cycle (from 100% until it sleeps itself from discharged battery) and let us know your total runtime in hours and minutes.


    For the reasons outlined above power meters can be wildly inaccurate unless properly calibrated - particularly involving older mac portables that have just been upgraded (i suspect strongly)


    I hope we can all share our info here and get closer to finding the culprit of reduced battery life with 10.8.2


    Also if no joy after trying above, please let us know your total runtime for 1 cycle, SMC version (available in About this mac, extended info) and upgrade method.





  • iinviktus Level 1 Level 1

    Also, after upgrading, I've got a Service Battery message. Horrible.

  • RHBC Level 1 Level 1

    Yes. Mine (MBA Late 2010) got quite a bit better after 10.8.2. I am getting just over 6 hrs on each charge on 10.8.2. now (was previously well over 7 hours on Snow Leopard, then down to 2-3 hrs on ML 10.8.0 , then about 4 hours on 10.8.1).  Not perfect, but acceptable at the moment  - and I can leave iCloud and Dropbox, and other "over the net" sync applications on as well.

  • weeasle Level 1 Level 1

    Hi RHBC,


    I am guessing yours is the 13 inch model? 


    Have you tried the inbuilt callibration routine?


    Many may not be aware it is best to use a full cycle at least once per 30 days (charge to 100% and then run to complete discharge and sleep when battery runs out). Doing a full cycle every 30 days is recommeded in Apples Battery Usage Guidelines to maintain best battery health.


    I have a strong suspicion after reading all 160+ pages of this thread that the issue may be for many that a callibration needs to be run after 10.8.2 upgrade as it seems to me that maybe some way 10.8.2 interacts with the 1.x SMC firware leads to a situation where callibration is poor..


    My 2c. - hope we can get closer to a root cause here in this thread by caring and sharing...

  • RHBC Level 1 Level 1

    Yes, it's a 13". And I did go through the calibration routine. Before that, it was showing only 4hrs initially after the upgrade, and I was furious for a day.  But after the calibration, it's getting consistently over 6 hrs now. 

  • weeasle Level 1 Level 1

    Ok well thats some reassuring news for me..  I upgraded to 10.8.2 because I need Xcode for development  and the Lion or above is needed.


    I have been hesitant updating- I have heard from a few here (richsadams and others) That about aan hour less runtime than the rated life under Snow Leopard seems to be the norm. It would seem there is a price to pay for having things run faster. Although its early days yet and I have not established for myself if ML is much faster than Snow Kitty and am hoping apple will iron out the battery life issues with Mac Portables and ML.


    Please be monitoring this thread Apple devs in high up places.. Please... (fingers crossed). I guess we should be filling out bug reports -  I will report back here in a few days my results. I am going to be as methodical as possible.


    I believe the App Store Update to 10.8.2 didnt update my SMC firmware so I will see how long I get on a full cycle after callibrating. Depending on results I will run the SMC firmware update (ie, if it aint broke dont fix it). and then report outcomes here and hopefully give tips which may help us form a united front in our Bug Reports to Apple.





  • weeasle Level 1 Level 1

    Also out of curiosity, did you run the update for SMC Firmware after the upgrade to 10.8.2?


    What is your current SMC Firware version listed as in Help- About this Mac- Extended info... ?


    Do you see Power Nap listed in your energy saver tab in sys prefs?


    I am hoping to collate some of this info into a Bug report and encourage others to do the same.


    Perhaps  this will lead to a patch being issued sooner, saving others headache and maybe also draw Cupertinos attention to the fact that they need to do some more tweaking under the hood to keep their customers satisfied on ML..





  • iinviktus Level 1 Level 1

    My SMC version after 10.8.2 is: 1.69f3. My computer's info is below.

  • RHBC Level 1 Level 1



      Model Name:          MacBook Air

      Model Identifier:          MacBookAir3,2

      Processor Name:          Intel Core 2 Duo

      Processor Speed:          2.13 GHz


      SMC Version (system):          1.66f60

  • RHBC Level 1 Level 1

    I don't use power nap because I don't need all the updates when it's asleep - not a function that is useful to me.  I am not reading any emails when it's closed, so why update it. I'll update it when I have time to read them.

  • asengskie Level 1 Level 1

    where i can see the POWER NAP???


    mine is MACBOOK PRO i7 2.9ghz mid 2012



  • weeasle Level 1 Level 1

    Thanks for reporting back so quickly.


    If I were you I would hold off updating the SMC Firmware until more users have reported their outcomes with late 2010 Airs and their full cycle runtimes before/after SMC Update.


    Also I too do not need or care for updates when my computer is asleep. As a developer I am well aware that almost as often as updates and fixes can bring improvements and fixes they can also untroduce regression errors and new bugs. I fimly espouse the old pearl of wisdom: If it aint broke dont fix it.   Which could be extended to If an update isnt necessary then it is usually better not to until the masses have torture tested it.


    I am copyimg the info you gave and will coolate a response to include in a Bug report (will do best to edit it down to a summary which shows Apple Devs a cause may have been isolated). I encouage others here to do the same:


    try to include a summary of your hardware software and a summary of what you believe to be the problem and possible causes --





  • weeasle Level 1 Level 1

    Thanks Iinviktus,


    Have you tried the callibration procedure (I previous outlined it in my post above).


    If not, please try this and then let us know how long your 2011 MBP goes one full cycle (from 100% to shutdown).


    Hopefully your info along with other people filed at  which are convincing well formed bug reports will help Apple get these bugs squashed quicker..





  • RHBC Level 1 Level 1

    Thanks, good advice. I will hold all my upgrades and curiosity from now on (after this experience) and wait unitl 1-2 months after the masses have tested in real life and read the complaints, and decide if it's something I can accept before I upgrade again.


    For asengskie - you can turn power nap off by clinicking the apple icon - system preferences - energy saver - then uncheck the Power Nap.

  • asengskie Level 1 Level 1

    thanks RHBC wow i think i dont have this POWER NAP on my energy saver but i already update to 10.8.2 =(