battery going bad?

Discussion in 'MacBook Pro' started by beedoola, Jul 24, 2012.

  1. beedoola macrumors member

    Joined:
    Jun 18, 2012
    #1
    I got 48% battery left and the time left is stated as "39 minutes"

    I'm on a early 2011 13'' MBP. 2.7 i7, 8gb ram.

    Do I need a new battery?

    Here are the battery/power specs:

    Battery Information:


    Firmware Version: 201
    Hardware Revision: 000a
    Cell Revision: 165
    Charge Information:
    Charge Remaining (mAh): 2305
    Fully Charged: No
    Charging: No
    Full Charge Capacity (mAh): 5002
    Health Information:
    Cycle Count: 249
    Condition: Normal
    Battery Installed: Yes
    Amperage (mA): -1285
    Voltage (mV): 11172

    System Power Settings:

    AC Power:
    System Sleep Timer (Minutes): 162
    Disk Sleep Timer (Minutes): 10
    Display Sleep Timer (Minutes): 143
    Wake on AC Change: No
    Wake on Clamshell Open: Yes
    Wake on LAN: Yes
    Display Sleep Uses Dim: Yes
    PrioritizeNetworkReachabilityOverSleep: 0
    RestartAfterKernelPanic: 157680000
    Standby Delay: 4200
    Standby Enabled: 0
    Battery Power:
    System Sleep Timer (Minutes): 60
    Disk Sleep Timer (Minutes): 10
    Display Sleep Timer (Minutes): 60
    Wake on AC Change: No
    Wake on Clamshell Open: Yes
    Current Power Source: Yes
    Display Sleep Uses Dim: No
    Reduce Brightness: No
    RestartAfterKernelPanic: 157680000
    Standby Delay: 4200
    Standby Enabled: 0

    Hardware Configuration:

    UPS Installed: No

    AC Charger Information:

    Connected: No
    Charging: No
     
  2. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #2
    No, the 48% is how much charge you have remaining, not your battery health. You simply need to recharge it.

    This should answer most, if not all, of your battery/charging questions:
     
  3. beedoola thread starter macrumors member

    Joined:
    Jun 18, 2012
    #3
    yes, I'm aware of that. What I meant was: is the time duration right with regard to how much charge is remaining. My friend has an older 13'' MPB with a Dual Core and she had maybe 60% remaining with a time quote of 4hrs left.

    now mine has gone back up - at least in terms of time: 40% charge remaining with 1:34mins. No backlit keyboard on..
     
  4. leftywamumonkey macrumors 6502a

    leftywamumonkey

    Joined:
    Jun 23, 2010
    Location:
    California
    #4
    Have you calibrated your battery in the last few months?
     
  5. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #5
    From the BATTERY LIFE FROM A CHARGE section of the Battery FAQ:
    The built-in batteries in the newer Mac unibody notebooks come pre-calibrated and do not require regular calibration like the removable batteries in older Apple notebooks.
     
  6. sweetbrat macrumors 65816

    sweetbrat

    Joined:
    Jun 17, 2009
    Location:
    Redford, MI
    #6
    The time remaining varies wildly up and down depending on what you're doing. If I run something using Flash, my time remaining goes down by at least half. When I turn Flash off, it goes back up. It's just a quick snapshot based on your current workload, so you can't compare it with anyone else's computer.
     

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