Accurate & Best Battery Estimator? (11 inch thread only): < 8 hrs Battery

Discussion in 'MacBook Air' started by johnjey, Jul 5, 2013.

  1. johnjey macrumors regular

    Jun 17, 2013
    Northern CA
    Just like a gazillion others, i am also looking for something that can give me a clear, correct and reliable "estimated battery left" information:

    I am trying to estimate battery life of 2013 11' i5/8GB/512 SSD machine: I am currently on the 11th battery recharge cycle: Machine is now 1+week old.

    I know the Battery estimates DEPENDS on the usage. However, we still need a solid application that can do accurate estimates based on the usage (for example, if i am playing netflix HD --> the sure-shot battery killer --> then we need to know accurately the estimated time left and not have to see FOUR different times displayed by these 4 different applications)

    I have:

    1. Coconut Battery

    2. Istat --> stupid wideget --> useless estimates (anywhere from 65 hours to 11 hours to ...u simply can't rely on this for battery estimates)

    3. Apple OS Battery Indicator isn't doing a good job either

    4. Interestingly, battery is NEVER 100% charged and is max charged at 99% (as per ISTAT) and Coconut shows maximum charge of i think around 5000+k but NOT the complete 5257mah (The actual battery capacity)

    I have been using this machine for 10 days now...

    Overall,This 2013 11 inches Macbook Air HAS NOT given me 8 HOURS battery life (i know Apple said UPTO 9) if you use it like a business user with 12 emails flying out, 7-8 email accounts (mac-mail), multiple browsers (multiple tabs), music playing, bluetooth-wifi always ON of-course, MS Office apps always running (excel, word, ppt's), multiple mac softwares like ADIUM, evernote, dropbox etc.. (and lets include an exception that you never played a netflix while doing all this) and played 40 mins of regular flash video

    And my worst fears are what will happen when i will install :

    PARALLELS and VMWARE FUSION on to this machine for Windows 8 usage

    If anyone of you 11 inch users have been able to achieve 8 hours with the usage i am talking about as above, please share....and 13 inch Fan-boys ==> Please DO NOT respond to this 11 inch specific thread with your 12+ hours of batter life as that doesn't make a dime difference to us 11'inch fanboys :)

    Thanks Guys !
  2. luisito macrumors regular


    Nov 15, 2012
    Do a search before posting.There is an ENTIRE thread about MBA 11in battery life already.
  3. GGJstudios macrumors Westmere


    May 16, 2008
    There is no such app that can give accurate estimates of time remaining. It is a constantly changing estimate, based on the workload on the system at any given point in time. This includes screen brightness and other settings, as well as all processes running. They are rough estimates and no app will make them more accurate.
    It's normal that your battery may stop charging between 93-99%. For details, read the CHARGING section of the following link.

    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.
  4. johnjey thread starter macrumors regular

    Jun 17, 2013
    Northern CA
    Dude, look at the posts i have in there at that thread, this is more about finding a battery Application as well....and not just the usage aspect !
  5. entatlrg macrumors 68040


    Mar 2, 2009
    Waterloo & Georgian Bay, Canada
    OP you've been obsessing about this for days...

    "accurate estimate" is an oxymoron.

    The tools already mentioned is all that's available, that's it.

    Let it go.
  6. jasonbrent macrumors newbie

    Jul 28, 2007
    Estimation is going to be a function of draw vs. capacity of the battery.

    Draw is going to be a function of whatever is running on your machine at a given point in time.

    You can see the current draw by running "ioreg -r -n AppleSmartBattery" in a terminal window (it might be -c and not -n, I forget).

    My 13" has a ~7150mAh battery. Which means to get 12 hours out of it, the average draw must be <= 595mAh.

    My current average usage is closer to 1mAh.. which means I'm not going to get closer to 12 hours until I make some changes in my workflow.

    anyway.. food for thought.

  7. Booji macrumors 6502a


    Nov 17, 2011
    I can get more than the 9 hours out of my 2013 11" i5/8/256 but I have to really baby it...back out of applications I'm not really needing at the moment, and keep it to 1-3 applications at one time - Safari with 1 or 2 tabs, a couple of MS Office applications and Evernote with a wifi connection.
  8. blueroom macrumors 603


    Feb 15, 2009
    Toronto, Canada
    My advice is to turn off the battery percentage indicator and don't obsess over it.
  9. NewbieCanada macrumors 68030

    Oct 9, 2007
    Apple's claims of up to 9 hours are for wireless web browsing. Period.

    The purpose of long battery life is INSURANCE. So you can give that presentation in the conference room, or take it to a meeting or lunch without having to worry about it running out. It's not "charge it at home at night and never, ever have to plug it in at work." Even if it did give 8-9 hours under the conditions you list, what would you do if you have a long day?

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