I have a Late 2011 Mac Book Pro 15" and recently the battery has very quickly gone from several hours of battery life to all of a sudden only apparently having 5-10 minutes

and by quickly I mean over the course of just a few weeks..

What i want to know is is this the End of life for my battery or is it malfunctioning and need a battery reset

If this a battery reset issue how do I do this on a mac I used to do this in the BIOS when I owned a PC Laptop but no idea how to do this with a Mac Book since there isn't one

Is this something that can be done through AHT?

  Battery Information:

  Model Information:
  Serial Number:    D86130308TRDGDLAW
  Manufacturer: SMP
  Device Name:  bq20z451
  Pack Lot Code:    0
  PCB Lot Code: 0
  Firmware Version: 406
  Hardware Revision:    2
  Cell Revision:    158
  Charge Information:
  Charge Remaining (mAh):   156
  Fully Charged:    Yes
  Charging: No
  Full Charge Capacity (mAh):   156
  Health Information:
  Cycle Count:  358
  Condition:    Service Battery
  Battery Installed:    Yes
  Amperage (mA):    0
  Voltage (mV): 11896

System Power Settings:

  AC Power:
  System Sleep Timer (Minutes): 10
  Disk Sleep Timer (Minutes):   10
  Display Sleep Timer (Minutes):    10
  Wake on AC Change:    No
  Wake on Clamshell Open:   Yes
  Wake on LAN:  Yes
  Current Power Source: Yes
  Display Sleep Uses Dim:   Yes
  GPUSwitch:    2
  PrioritizeNetworkReachabilityOverSleep:   0
  Standby Delay:    4200
  Standby Enabled:  0
  Battery Power:
  System Sleep Timer (Minutes): 10
  Disk Sleep Timer (Minutes):   10
  Display Sleep Timer (Minutes):    2
  Wake on AC Change:    No
  Wake on Clamshell Open:   Yes
  Display Sleep Uses Dim:   Yes
  GPUSwitch:    2
  Reduce Brightness:    Yes
  Standby Delay:    4200
  Standby Enabled:  0

Hardware Configuration:

  UPS Installed:    No

AC Charger Information:

  Connected:    Yes
  ID:   0x0100
  Wattage (W):  85
  Revision: 0x0000
  Family:   0x0085
  Serial Number:    0x0058432a
  Charging: No
  • If you look up in the about this mac, what does it say about how many cicles does your batter has.
    – Ruskes
    Sep 30, 2013 at 19:38
  • According to system information I am at 358 charge cycles Edited posted with power information Sep 30, 2013 at 23:43
  • I am assuming since the battery condition says Condition: Service Battery its torched and i will need to replace it Oct 1, 2013 at 0:00
  • sorry, but that is what it says it is EOL, just in case you wanted to know hat happened read my post.
    – Ruskes
    Oct 1, 2013 at 0:07

3 Answers 3


Possibly your battery has developed a phenomenon called internal temporary short or known as Whisker.

A whisker is a deposits growth inside the batter between the positive and negative pole consisting of Lithium crystals.

Eventually this deposit shorts the poles leading to battery life time shortage and erratic behavior.

There is not much you can do about that other than getting a new battery.

Sources: http://batteryuniversity.com/learn/article/sulfation_and_how_to_prevent_it/



In summary:

Because of those internal whiskers your battery does not hold the charge any longer.

  • lovely just what i need another $160-$180 bill this month >< Oct 1, 2013 at 2:36
  • You can get a replacement battery from the Apple store for $130, don't pay any more than that. Obviously there are also online stores you can buy official and unofficial replacements for as little as $70 if you're into that.
    – ian.pvd
    Oct 17, 2013 at 17:31

While I can't explain the rapid loss in battery life, the best way to determine the battery health would be through the system profiler. There are instructions on how to check the battery cycle count on a Mac here: http://support.apple.com/kb/HT1519

Along with benchmarks for healthy cycle counts.

For what it's worth, my 15" MacBook Pro needed a replacement battery a few months ago. Although the decline in battery life was a little bit more prolonged.


Option + Click on the battery percentage in the menu bar. this will show the condition of the battery.

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