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  1. #1
    Leaving MBP on power supply
    T'Pring's Avatar
    Member Since
    Nov 06, 2011
    Location
    Pacific NW
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    43
    Your Mac's Specs
    MBP early-'11, Sierra, 4GB RAM; MBP mid-'15, 16GB RAM
    Leaving MBP on power supply
    Is it considered better to leave the laptop plugged in while using it or, run it on battery until it needs to be recharged? [Or maybe some combination of the two that maximizes battery life.]


    Thanks
    ---------------------
    Love that trackpad!

  2. #2
    If an MBP is plugged in, it will charge the battery that is not at 100% while using power from the mains. Once the battery is charged, the power remains on the mains it doesn't not stress the battery. So no harm of overcharging your battery by being plugged in all the time.

    The one thing you need to remember is that these batteries need to be worked out to be able to maintain their ability to hold a charge. Otherwise, they tend to get lethargic and won't hold a charge when you need them. So while you don't need to constantly plug and unplug the charger, you should try to use the computer on the battery often enough for it to deplete a bit and be charged back up again.

    During my work day I tend to leave my MBP plugged in. Once I go home, I use the machine for an hour or two at night purely on battery and it gets down to about 60% in that time. I then plug it back in the next day.
    --
    Regards
    ...Ashwin


  3. #3
    Leaving MBP on power supply
    ferrarr's Avatar
    Member Since
    May 21, 2012
    Location
    Pawtucket, RI, US
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    5,149
    Your Mac's Specs
    L2014 Mac mini macOS Mojave, iPhone 8+ iOS 12, 12.9" iPad Pro 1 iOS 12, Pencil 1
    Apple knew people will have questions, this is what they have to say, https://support.apple.com/en-us/HT204054
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  4. #4
    Leaving MBP on power supply
    RadDave's Avatar
    Member Since
    Jan 20, 2012
    Location
    North Carolina
    Posts
    4,294
    Your Mac's Specs
    MBP 13" (2013); 8 GB RAM; SSD 256 GB; OS 10.13.2
    Quote Originally Posted by T'Pring View Post
    Is it considered better to leave the laptop plugged in while using it or, run it on battery until it needs to be recharged? [Or maybe some combination of the two that maximizes battery life.]
    Hello - you've already received some great advice and the Apple link provided answers many questions. For myself, I usually leave my two Apple laptops plugged into power when using - occasionally, I will let their batteries run down nearly an entire cycle, then recharge - one rationale is to recalibrate the monitoring features of the battery, although I'm not sure that more modern Li Ion batteries need that periodic power exhaustion?

    Now, you should know how to check your 'battery health' - there are a number of options, such as: 1) Option Key + Battery icon in menu bar - condition will be given; 2) System Information -> Power will display a lot of your battery's stats, such as 'cycle count' & 'full charge capacity'; and 3) Coconut Battery, a free DL at the link provided - pic below from this recent article on battery health - note that cycles used is shown & battery health of 81.1% (i.e. current charge capacity/design capacity or 7098 mAh/8755 mAh). Modern batteries used by Apple should provide 1000 cycles - and 80-100% battery health is considered 'good' condition. Dave

    .
    x4coconutbattery-541x1024.png.pagespeed.gp+jp+jw+pj+ws+js+rj+rp+rw+ri+cp+md.ic.4ihGrbPim2.png
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