12 Replies Latest reply: Jan 15, 2013 4:52 PM by sanjampet
srelan Level 1 Level 1

I have always had perceived battery issues with my MacBook Pro 15 (mid-2010) compared to the advertised life.  Never more than 3.5-4 hours.

However, I recently followed the instructions on Apple page for "Resetting the System Management Controller (SMC)".    Follow them exactly- suggested rest times after charge, 5 hour wait time while discharged, etc,. etc.


However, upon doing this the battery life shortened even further immediately.    Now I'm getting 2.75 hours at best.    Now, logically I don't think this is a battery cell thing else I would have been getting 45min-1hr more time just before doing the reset and previous 2 years.


So...  I did the full SMC reset again just to make sure.  Nothing.  Still getting drainage on the clock from the beginning.   100% to 96% withing 2-3 minutes.  Down to red 13% withing 2 hours.    No flash video watching.  Just the same MO of usage and activity I did before the reset where I got better battery life (but thought was poor).


Question1: what gives?

Q2: anything to do now to really fix it - at least back to life I had yesterday and before?

Q3: dont want to shell out $175 for anoth battery right now but this is ridiculous.  <3 hours is almost not usable when in the field. And the 4hrs I only ever got before is still WAY BELOW the original advertised life of 8-9+hours    Will putting in a new battery even make things better than 4 hours?

Q4:  was my regular usage on the AC adapter to possibly blame for the poor life out of the box?

MacBook Pro, OS X Mountain Lion (10.8.2), 15" 2.53GHz i5
  • sanjampet Level 5 Level 5

    check your activity monitoe>all processes>CPU and see if there is something eating. You can also goto the Apple logo in the tool bar, click About this Mac>system report, in the left column click power and check under battery, health, cycles,charging, anything that looks unusual.  Also check system power settings for anomilies there as well.

  • Baby Boomer (USofA) Level 9 Level 9

    I have always had perceived battery issues with my MacBook Pro 15 (mid-2010)


    Did you report this to Apple tech support while still under your one year warranty?  Their response?


    Your topic shows (mid-2012).  Yet, your posting shows a different year.  Is this a typo?



















  • srelan Level 1 Level 1

    thanks, yes title is a typo.  MBP is a mid-2010


    Yes, I contact Apple when under warranty and just got the normal runaround.  Phone rep said the advertised battery life was a maximum and different usage would vary. blah, blah... and could take in to AppleStore but they wouldn't mail me a box for a repair order since I admitted I was getting 4 hours (I live 4 hour drive to nearest store so that was a no-go).

    Of course but HALF of advertised battery life has always seemed like b.s. to me.

  • srelan Level 1 Level 1

    nothing obvious in CPU processes.   And for system report, yes I've looked, but wouldn't know what unusual ranges would be.  This is what I see now:


      Model Information:

      Serial Number:        

      Manufacturer:          SMP

      Device Name:          bq20z451

      Pack Lot Code:          0

      PCB Lot Code:          0

      Firmware Version:          201

      Hardware Revision:          000a

      Cell Revision:          158

      Charge Information:

      Charge Remaining (mAh):          3592

      Fully Charged:          No

      Charging:          No

      Full Charge Capacity (mAh):          6031

      Health Information:

      Cycle Count:          636

      Condition:          Normal

      Battery Installed:          Yes

      Amperage (mA):          -1486

      Voltage (mV):          11379


    <Edited by host>

  • sanjampet Level 5 Level 5

    Your charger says it is not charging, not fully charged no health info. Yur charge cycle is getting uo there, and the way it had been maintained could have have caused this.  I would take it in to an Apple store or an AASP, who you know that they know what they are doing.  These numbers are not encouraging.  It looks to me your mBP needs servicing. It could be some other componet that is having a failure.  Best of luck.  I do not  think it will heal itself.  There might be someone else on this sight who might have more info, god knows, there are plenty.   ATB

  • srelan Level 1 Level 1

    FYI, It was running off battery when I copied that info.    Thus "Your charger says it is not charging"

  • sanjampet Level 5 Level 5

    Please send anoter screen shot with the powe supply connected.  THX

  • John Galt Level 8 Level 8

    Resetting the System Management Controller is not intended to accomplish anything you seek.


    Question1 and Q2: anything to do now to really fix it - at least back to life I had yesterday and before?


    First you must acknowledge that nothing runs as well as a new battery. They age and then they die. Trying to regain the life it had in the past is guaranteed to be a futile pursuit. 


    Battery depreciation is a fact of life with any laptop, and if you stay loyal to genuine Apple batteries (as you should) they will cost you 50¢ a week. Quality aftermarket knockoff batteries are slightly cheaper to buy. They are likely to cost you more than 50¢ a week.


    I have a new MacBook Pro and its brand new Apple battery lasts six or seven hours in what I consider normal use. This is reasonable. Eight or nine hours will be achieved only with optimal use. You won't get half that if you are streaming Flash video, for instance.


    Q3 dont want to shell out $175 for anoth battery right now but this is ridiculous.


    $175 is not correct for your MPB. Apple batteries are only $129, replacement included. You can ship it to them if you can afford to be separated from your Mac for a few days. http://support.apple.com/kb/index?page=servicefaq&product=Macnotebooks


    Q4 was my regular usage on the AC adapter to possibly blame for the poor life out of the box?


    Maybe. Batteries need to be exercised. Keeping them on ac power all the time will unquestionably reduce their service life, as will allowing them to sit completely discharged for a long period of time. Discharge them once a month or so and above all, keep them cool. Don't use cases or "skins" as these inhibit proper heat dissipation for which your MBP was designed.


    Additional information:


    If you are using any third party system modifications, you may be placing additional burdens on your system that Apple has no way of knowing about or controlling. This includes anti-virus junk, system "optimizers" and the like. There are many potential causes for unexpectedly short battery life but this is a very common cause. Manufacturers of such things won't care if their poorly written software reduces your battery life. After they take your money, their work is complete.


    Only you can know what you installed. If you are concerned this may be a contributing factor write back and I will suggest some things to look for.


      Cycle Count:          636


    By the way this is not a very high cycle count, but this battery is well into its golden years. In my opinion, it doesn't owe you much more than it has given.

  • srelan Level 1 Level 1

    understand everything you have written.  However, doesn't explain why things instantly got worse after performing the SMC reset.  Most definitely so.  Which is the whole premise behind my post/question.  Never got life this short, and bam, right after the reset it knocked a 1/3 more life of the battery.


    As for your last comment about cycle count.  Understand that as well, however as I wrote in my initial question, the 4 hour max life has been since the machine was brand new mid-2010.  Have never ever got more than 4 hours evern when the cycle count was in single digits.   That is why I am understandably confused.

  • John Galt Level 8 Level 8

    This is very cursory but read it anyway: Runaway applications can shorten battery runtime


    There many factors that contribute to battery life but IMO four hours is unusual, and not acceptable.


    If you are so inclined, consider the following. It may help, or it may not, but it is harmless and simple enough to try:

    Apple Support Communities contributor etresoft wrote a very useful app to quickly gather certain system information that may help point to a cause of this problem. Go to his website, download and run EtreCheck:




    The rainbow "wait cursor" will appear for a brief moment as it collects its data. Do not be concerned about anything that says "Problem" or "failed".


    Copy and paste its output in a reply.


    EtreCheck was designed to remove any personal information (such as your computer's name and serial numbers) but if you see anything that looks like an email address or any other personal information that should not be divulged to others, please delete or obscure that information when you post the reply.


    When you are finished with EtreCheck, quit the program. It occupies very little space, and you can keep it or drag it to the Trash as you wish.

  • srelan Level 1 Level 1

    thanks. will read.   So, in others experience with this MBP, what kind of normal day to day life have others been getting with just browsing usage?  (assume none were getting the 8-9hour advertised)

  • sanjampet Level 5 Level 5

    It depends on what applications you are running, and the length, video, games, music, and more consume more battery life. How you treat your battery will also affect the life span.  I get 5-6 hrs doing word processing, 2-3 hrs doing video/music, my battery is approx 600 hrs, and loosing time all the time. The recharge routine has effect on the battery life,as well as running it down past 20%.  So a lot depends on the maintenance and usage.  But I don't know anywhere near what these guys do.  Don't listen to me.