Skip navigation

Wasting my MBA battery ?

619 Views 10 Replies Latest reply: Jun 1, 2013 6:18 PM by And0 RSS
And0 Calculating status...
Currently Being Moderated
Sep 20, 2012 10:08 AM

Hello Community,

 

I've got a MBA for about 10 weeks and so far I've had about 54 load cycles. (constantly on the move etc)

 

Running coconut gives me some alarming results

 

Design Capacity - 6700

Current Capacity - 6437 - 96%

 

I'm just wondering whether I'm wasting the battery, or is the program not showing data properly.

 

Here is a comparison based on their new service (CoconutBattery Online)

 

Looks kind of funny to me... Is it gonna fail after what... a month...

 

Screen Shot 2012-09-20 at 3.20.00 AM.png

MacBook Air (13-inch, Mid 2012), Mac OS X (10.7.4)
  • SP Forsythe Level 5 Level 5 (5,200 points)
    Currently Being Moderated
    Sep 20, 2012 10:24 AM (in response to And0)

    Your graph line is very straight. This would imply that only two numbers were used in the calculation of the graph, the starting point and the end point.

     

    Having as few as two readings can lead to only one conclusion here. Don't trust the graph to indicate a trend.

     

    My battery is 3 months old, and has just 14 cycles. It is currently at 97%. However, that lone figure doesn't paint the picture at all. I record my capacity every couple of weeks, and a month ago I was at 96%, and two weeks ago I was at 98%. This kind of fluctuation is consistent with the  three MBA's I  own. It's not a single point that matters, but an actual demonstrable trend over a dozen or more readings over weeks. If it remains consistent, I would expect that my readings will hover around the mid 90% range, for a year or so.

     

    My only point is that what you have experienced may be perfectly normal, and it may not. Not only is it too early to tell, but without a statistically important copious number of readings, we also don't know.

     

    Have it checked out at a Genius Bar. See if they have any diagnostics to give a pinpoint indication.

  • Retired Engineer Level 4 Level 4 (2,710 points)
    Currently Being Moderated
    Sep 21, 2012 3:54 AM (in response to And0)

    As long as the capacity is 80% or more the battery is within Apple's design specification for the battery.

    It is not possible, with todays technology, to build a battery that is at exactly 100% of design capacity.  In all probability your battery was at 97% when it left the factory.  Unless it drops below 80% Apple is not going to replace the battery.

  • JasonFear Level 5 Level 5 (4,935 points)
    Currently Being Moderated
    Dec 2, 2012 10:23 PM (in response to And0)

    If you're really interested in obtaining an accurate representation of battery health, you need data values closer together. Every 3 months and 45 odd charge cycles isn't going to give an accurate representation of health deterioration.

     

    I save my Coconut battery statistics every Monday morning (regardless of use) and that can paint a much clearer picture of a trend.

  • JasonFear Level 5 Level 5 (4,935 points)
    Currently Being Moderated
    Dec 3, 2012 8:16 AM (in response to Retired Engineer)

    Retired Engineer wrote:

     

    As long as the capacity is 80% or more the battery is within Apple's design specification for the battery.

    It is not possible, with todays technology, to build a battery that is at exactly 100% of design capacity.  In all probability your battery was at 97% when it left the factory.  Unless it drops below 80% Apple is not going to replace the battery.

     

    Retired Engineer hit the nail on the head. Now if you want, you can pop a Xanax (to take the edge off) and just head to the down a Genius Bar right now and say that there's something wrong with your battery. They'll probably thank you, the paranoid ones were always a freebie appointment, like having a 2nd break. Why wait another two months?

Actions

More Like This

  • Retrieving data ...

Bookmarked By (0)

Legend

  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.