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  1. #1
    Newbie here - battery related question
    Hi guys,

    Just bought a macbook air 2019 model and im trying to find out how to maintain my battery life. I know there are 1000s of online articles, forum posts etc but im really getting mixed answers/reviews...

    From one reliable source i saw that we shuld unplug when its around 100%, then charge again when its 20-30%.. some other sources (websites) / users told me that i can just keep it plugged 24/7 and just need to drain the battery once or twice a month... so which one is true? If i keep it plugged in lets say 10-12 hours daily do you think that will affect the battery? i.e. heat up the battery etc?

    Thanks
    Chris

  2. #2
    Newbie here - battery related question
    MightyGem's Avatar
    Member Since
    Nov 29, 2010
    Location
    Warrington, UK
    Posts
    2,324
    Your Mac's Specs
    PPC Mini, 10.4.11. Intel Mini, 10.6.8. MacBook Pro, 10.12.6. iPhone 5 iOS 11.3.
    Rep Power
    12
    My mid 2012 MBP is now just over 4 years old. It's on 24/7 and on charge for at least 20 hours a day. Its battery cycle count is 553 and it retains 80% of it's original charge capacity.

    I also have a 2009 White MacBook that, again, is on 24/7 and on charge 24/7. Its cycle count is 977 and battery condition is 74% of original capacity. Those numbers haven't changed since it went on 24/7 operation two years ago.

    It's designed to run on a battery, so just use it and don't worry. It's more likely that you'll decide it's time to get a new laptop before it needs a new battery.

    This should tell you all to need to know:
    How to keep your MacBook Pro battery healthy for years

  3. #3
    Newbie here - battery related question
    ferrarr's Avatar
    Member Since
    May 21, 2012
    Location
    Pawtucket, RI, US
    Posts
    6,952
    Your Mac's Specs
    L2014 Mac mini macOS 15, iPhone 8+ iOS 13, 12.9" iPad Pro 1 iPadOS 13,  Pencil 1
    Rep Power
    14
    Here is another Apple Support Article, Batteries - Maximizing Performance - Apple
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  4. #4
    Newbie here - battery related question
    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    41,402
    Your Mac's Specs
    2011 17" MBP 2.2ghz, 16gig ram, OS 10.11.6
    Rep Power
    43
    It really depends on how you use your portable devices. If you're generally not near an electrical outlet...then you got to rely on the battery. If you are near an available electrical outlet much of the time...then it makes sense to be plugged in.

    Quote Originally Posted by johnchristy44 View Post
    From one reliable source i saw that we should unplug when its around 100%, then charge again when its 20-30%...
    This will accomplish one thing...piling up battery cycles on the battery. And of course every battery can only be recharged just so many times before battery runtime on a single charge decreases.

    Quote Originally Posted by johnchristy44 View Post
    ...some other sources (websites) / users told me that i can just keep it plugged 24/7 and just need to drain the battery once or twice a month... so which one is true?
    This is the method I generally use. I'm plugged in most of the time...but a couple times/month I run the battery down to like 50%...then recharge. This keeps the battery electrons running in both directions periodically.

    Quote Originally Posted by johnchristy44 View Post
    If i keep it plugged in lets say 10-12 hours daily do you think that will affect the battery? i.e. heat up the battery etc?
    No. When plugged in...the battery is not being charged 100% of the time. The computer has a charging circuit that shuts off charging once the battery gets to 100%. Then the charging circuit doesn't kick back in until the battery drops below 95% (which takes some time since the computer is plugged in).

    The battery will actually heat up more when the computer is operated on battery power...since this is when the battery is being used...and battery electrons are flowing.

    HTH,

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  5. #5
    Newbie here - battery related question
    MacInWin's Avatar
    Member Since
    Jan 01, 2009
    Location
    Winchester, VA
    Posts
    7,005
    Your Mac's Specs
    MBP 15" Mid 2015, iPhone 11 Pro, an iMac, plus ATVs, AWatch, MacMini
    Rep Power
    27
    You've received excellent advice from the previous comments. My only $.02 is to second what Nick said. If you are near a mains power supply, use it. I have my MBP on my desk most of the time, plugged into mains power. My mid-2015 battery was replaced by Apple as part of the battery recall for this model, so it's fairly new. The battery was manufactured 470 days ago, has a total of 13 cycles on it, capacity is nearly at design capacity, 99.1%. After two years, all lithium batteries begin to decay, slowly, because of chemical changes internal to the battery. The decline is fairly slow for a few years, then steepens. Using a lot of cycles can shorten the battery. Most recommendations for lithium batteries are to keep the battery above 70% as much as you can. Deep cycles (below 40%) are very hard on the battery, so try to avoid them. Apple used to make a recommendation to run the battery down once a month, but that was not for the battery health. They wanted to recalibrate the measuring circuit to the battery so that the %/time remaining was more accurate.

    Basically, use the machine and don't think about the battery much. Near mains? Plug it in! Not near mains? Don't worry about it.
    Jake

  6. #6
    Thank you very much all, i really appreciate your detailed replies. Thank you

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