Leaving MBP plugged in when it's charged?

Discussion in 'MacBook Pro' started by SephirothXR, Aug 17, 2009.

  1. SephirothXR macrumors 6502

    Nov 27, 2008
    For long periods of time that is. Is it all right even though it says its power source is the power adapter? It won't mess up the battery or anything right?
  2. iheartzombie macrumors member


    Aug 2, 2009
    i don't think it's good.

    my MBP battery puffed out and broke because i kept it plugged in all the time
    i don't know if it was over charging it or whatever.

    that's why i'm kinda skeptical about the built-in battery idea.

    but then again my MBP battery was 3 yrs old when it happened.

    still, if the unibody battery puffs out like my MBP's battery
    there goes your unibody design because i can see it bending the unibody metal outwards like how the battery did when it busted.
  3. yetanotherdave macrumors 68000


    Apr 27, 2007
    Bristol, England
    It's fine. When the battery is full, it just wont charge, nothing bad will happen to it.
    I believe the computer actually runs a little slower when on battery only, I could be wrong about that - edit: scratch that, that was if you run with the battery removed and just off the power cable.
  4. belvdr macrumors 603

    Aug 15, 2005
    No longer logging into MR
    The charging system should prevent it from overcharging the battery. It should be fine.
  5. HLdan macrumors 603


    Aug 22, 2007
    No worries, I keep mine plugged in all the time. It's stops charging on it's own so it won't affect the battery. There are many people that use their notebooks as desktop replacements so they keep them plugged in all the time. The one's the retail stores are plugged in all the time. They wouldn't keep them plugged in if the battery exploded over time.
  6. shambo macrumors 6502a


    Apr 4, 2009
    Do not do this EVER unless you want to ruin your battery.
  7. pknoot macrumors newbie


    Apr 7, 2009
    Northern California
    Although nothing disastrous should happen, it is recommended to allow your battery to cycle from full charge to empty and back in order to maximize battery life. Leaving it plugged in all the time does not allow for that, as it effectively tops off the battery continuously. The ideal situation is to unplug the charger as soon as the light turns green, use the MBP until the battery completely dies, and then allow it to rest for a while (overnight is best) before recharging. You'll get maximum battery life with minimal overheating issues.
  8. yetanotherdave macrumors 68000


    Apr 27, 2007
    Bristol, England
    You're only meant to do that occasionally, like once every month or two.
  9. sammich macrumors 601


    Sep 26, 2006
    That's right. Apple recommends on their site (and even gives you an iCal event) that you completely drain your battery every month.

    Mine is plugged in 99% of the time, had this particular battery for about 8 months with about 5 cycles on it, 100% health.
  10. vanc macrumors 6502

    Nov 21, 2007
    I keep my MB & MBP plugged in all the time in the day time. Then unplug and use batteries occasionally after work.

    My 2007 MacBook still holds 100% charge after two years.
  11. CJS7070 macrumors 6502a


    Dec 10, 2008
    Chicago, IL
    As others have said, the charge controller should prevent the battery from being overcharged, thus preventing damage. If you're not using it and are still worried, though, you could unplug it. No harm done either way.
  12. highertechnology macrumors 6502a

    Jul 31, 2009
    Mine is always plugged in, but it has to be with my external monitor. I do unplug it occasionally though to calibrate.
  13. sn0warmy macrumors 6502a


    Mar 26, 2009
    Denver, CO

    I kept my old Macbook Pro plugged in 99% of the time for just over 4 years. And even on the day I sold it my battery still lasted over 3 hours.

    These Apple laptops with the magsafe adapters are designed to stop charging the battery once it hits full. I have been, and plan on continuing to, run my laptop plugged in at work 8 hours a day, 5 days a week. And I'm sure my battery will still hold a full charge for years to come.
  14. ascender macrumors 68020

    Dec 8, 2005
    I have to say its strange seeing so many battery health topics on this forum. For as long as I can remember, I don't get too bothered about this and just use the laptop as I want to use it. When the battery gets low, I plug it in and when its charged again, off I go. This is often at the end of the day, meaning it will be plugged in charging overnight. I've never had any battery life problems with any of the Mac laptops I've owned, so are some people just unlucky or worrying about nothing thanks to the vast amount of info & advice on forums like this?
  15. Ntombi macrumors 68040


    Jul 1, 2008
    Bostonian exiled in SoCal
  16. maflynn Moderator


    Staff Member

    May 3, 2009
    I've done this with all of my PowerBooks, ibooks, MacBook Pros and have yet to have any issues with the battery. The circuitry stops charging the battery when its fully charged.

    What are your options if you don't do this
    1. remove the battery and run on a/c only? You'll cut the GHz in half (apple reduces the speed when there's no batter)
    2. Run on battery and continually drain/charge it. This is even worse for the battery because you exhaust the finite charge cycles in the batter.

    All in all, the computer is designed to run on a/c where available and have the battery in laptop even if the battery is fully charged.
  17. mZex macrumors member


    Aug 9, 2009
    Personally I never EVER use my MacbookPro on battery - for well over a year it has died when disconnected for a few minutes (although will drain efficiently on sleep for like ... ever, which has always confused me)

    I guess those times where i left it on my fluffy bed and it actually cut out (from heat?) - may not of helped ... but im no expert :p

    My solution is ... I am gonna buy an iMac :p - So used to not having portability now it seems logical.
  18. fallenphoenixes macrumors newbie

    Aug 17, 2012
    Don't unplug it the moment it turns green! Someone gave me the false information that the whole cycle is supposed to happen every day and just yesterday my macbook pro died with the battery at 0% health and no charging capabilities, displaying a "replace it now" message. It was only 2 years old but had over 1000 cycles so make sure you only do the unplug cycle once or twice a month.
  19. sweetbrat macrumors 65816


    Jun 17, 2009
    Redford, MI
    I know you're new, and this isn't to be rude, but you might want to check the dates on a thread when you make a post. The last post in this thread before you was 3 years ago...I highly doubt the OP is still looking for help.
  20. GGJstudios macrumors Westmere


    May 16, 2008
    Even though this is a 3 year old thread, that is bad advice. You can plug in or unplug any time you want. You certainly can and should put more than just one or two cycles a month on a battery, to keep it healthy. If you had over 1000 cycles on a battery, it was likely time for a replacement, as they aren't designed to last forever. They are consumable items.

    Run on battery whenever you need to and plug it in whenever you can. You can plug or unplug at any time, regardless of the charged percentage. Just make sure you don't run on AC power all the time, as your battery needs to be used regularly to stay healthy. This should answer most, if not all, of your battery/charging questions:

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