3 Replies Latest reply: Nov 15, 2012 12:47 PM by Wayne Contello
computergeek97 Level 1 Level 1 (0 points)

Hello, I have a Late 2011 13" MacBook Pro [2.4GHz, 6GBs RAM, 500GBs HDD], I have had it now for about nine months. Just last week I was averaging about 5-6 hours of battery life running Chrome and Evernote. Within about a day, running the same applications my battery only lasts for about 2 hours. I am a student and use my laptop to take notes, so any battery life with less than 4 hours isn't possible. I took it in to my local Apple store, the "Genius" told me to reinstall Mountain Lion, so I did [archive and reinstall] and the same problem still occur.

MacBook Pro (13-inch Late 2011), OS X Mountain Lion (10.8.1)
  • 1. Re: Battery Life Issues
    sig Level 8 Level 8 (35,770 points)

    Launch System Information from the Utilities folder. Select Power from the left side column. Copy and paste the info from the right side, Battery Information" into your reply post.

  • 2. Re: Battery Life Issues
    computergeek97 Level 1 Level 1 (0 points)

    Here it is.


    Battery Information:


      Model Information:

      Serial Number:          9G15206G8D3NB

      Manufacturer:          DP

      Device Name:          bq20z451

      Pack Lot Code:          0

      PCB Lot Code:          0

      Firmware Version:          201

      Hardware Revision:          2

      Cell Revision:          164

      Charge Information:

      Charge Remaining (mAh):          3980

      Fully Charged:          No

      Charging:          No

      Full Charge Capacity (mAh):          4971

      Health Information:

      Cycle Count:          191

      Condition:          Normal

      Battery Installed:          Yes

      Amperage (mA):          -1387

      Voltage (mV):          11803


    System Power Settings:


      AC Power:

      System Sleep Timer (Minutes):          0

      Disk Sleep Timer (Minutes):          10

      Display Sleep Timer (Minutes):          15

      Wake on AC Change:          No

      Wake on Clamshell Open:          Yes

      Wake on LAN:          Yes

      Display Sleep Uses Dim:          Yes

      PrioritizeNetworkReachabilityOverSleep:          0

      Standby Delay:          4200

      Standby Enabled:          0

      Battery Power:

      System Sleep Timer (Minutes):          10

      Disk Sleep Timer (Minutes):          10

      Display Sleep Timer (Minutes):          3

      Wake on AC Change:          No

      Wake on Clamshell Open:          Yes

      Current Power Source:          Yes

      Display Sleep Uses Dim:          Yes

      Reduce Brightness:          Yes

      Standby Delay:          4200

      Standby Enabled:          0


    Hardware Configuration:


      UPS Installed:          No


    AC Charger Information:


      Connected:          No

      Charging:          No

  • 3. Re: Battery Life Issues
    Wayne Contello Level 6 Level 6 (13,620 points)

    Using the information from your previous post:


      Full Charge Capacity (mAh):          4971

      Health Information:

      Cycle Count:          191

      Condition:          Normal

      Battery Installed:          Yes

      Amperage (mA):          -1387



    the estimated time to empty from a full charge is: FCC / average current


    4971 / 1387 = 3.58 hours


    this is not as good as 4 hours but not as bad as 2