Battery going from Service Needed to Normal?

Discussion in 'MacBook Air' started by Gjwilly, Jan 25, 2016.

  1. Gjwilly macrumors 68030

    Joined:
    May 1, 2011
    Location:
    SF Bay Area
    #1
    I repurposed my son's old 2011 Air.
    He'd been using Bootcamp 100% of the time but had Yosemite installed.
    When I booted back to Yosemite it had the Service Needed warning on the battery.

    I then booted off a Mavericks installer to wipe the hard drive and return it to one partition.
    After the Mavericks installation completed it still said Service Needed.
    I then upgraded to El Capitan and after that it now says that the battery is Normal.

    Does that sound normal?
     
  2. bernuli macrumors 6502

    Joined:
    Oct 10, 2011
    #2
    My guess is yes, normal.

    I think when in BootCamp cycles and other battery type info is not properly tracked by the OS. But just guessing here.
     
  3. Gav2k macrumors G3

    Gav2k

    Joined:
    Jul 24, 2009
    #3
    The battery is teetering on needing servicing. If you go into the system info page and click the battery you'll see its condition.
     
  4. DeltaMac macrumors 604

    DeltaMac

    Joined:
    Jul 30, 2003
    Location:
    Delaware
    #4
    Likely the battery is close to replacement time, and the system will show either normal, or Service Battery from day to day.
    You can view the System Information, Power tab. That will show how many charge cycles are reported by the battery, as well as full charge capacity, and other hardware details. A 5-year-old battery may have a lot of charge cycles.
    Finally, the firmware in your laptop keeps track of the battery history - not the operating system. The OS may interpret those results differently, and may use the battery differently - but the hardware doesn't change. If the battery is on the edge, you may see the message change at times, but overall, the numbers reported by the battery won't change much.
     
  5. Gjwilly thread starter macrumors 68030

    Joined:
    May 1, 2011
    Location:
    SF Bay Area
    #5
    Did that every time.
    System info says normal.
    Coconut Battery says good.

    It's got over 400 cycles and it's definitely old but I don't want to replace it until I have to.
     
  6. Gav2k macrumors G3

    Gav2k

    Joined:
    Jul 24, 2009
    #6
    What is the current charge capacity?
     
  7. DeltaMac macrumors 604

    DeltaMac

    Joined:
    Jul 30, 2003
    Location:
    Delaware
    #7
    The "suggested" maximum battery cycles on your 2011 is 1,000 - so "over 400" is not so much.
    The important point, I think, is to know how long you can use the battery on a single charge.
    2011 11-inch Air would get 5 hours as the listed expectation. The 13-inch would expect around 7 hours.
    When full charge battery life drops to an unacceptable level, then you replace. That would depend on what you (or the user) decides is unacceptable battery life. IMHO, 11-inch should be OK with more than 2 hours. The 13-inch - maybe 2.5 hours, more or less.
    Anyway - you are out of warranty, so it's all up to you if that "service now" message will decide what you do with your MBAir. If it it starts coming up more often, then you get to decide if battery replacement is warranted, or even worth the cost... I know some folks that have decided to ignore the "service battery" message, and the battery continues to work acceptably.
     
  8. Gjwilly thread starter macrumors 68030

    Joined:
    May 1, 2011
    Location:
    SF Bay Area
    #8
    5294
     
  9. Gav2k macrumors G3

    Gav2k

    Joined:
    Jul 24, 2009
    #9
    6700 is the original so 5360 is the 80% level so the warning will be popping up and going away every couple of days.
     
  10. Gjwilly thread starter macrumors 68030

    Joined:
    May 1, 2011
    Location:
    SF Bay Area
    #10
    Thanks all.
    I was just worried about it suddenly "venting with flame" as we used to say in the flashlight world.
     
  11. Gav2k macrumors G3

    Gav2k

    Joined:
    Jul 24, 2009
    #11
    That could happen to a brand new battery but more likely a worn one.
     

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