Best way to preserve macbook pro battery?

Discussion in 'MacBook Pro' started by handsomelife, Feb 1, 2010.

  1. handsomelife macrumors member

    Feb 1, 2010
    Sorry if this has been covered before, just wanted a bit of clarification.

    If I keep the charger in constantly then does that effect the battery? I assume my macbook is running solely off the mains. Or should I let the battery run itself down then charge it up again and repeat constantly?

    Any help would be great, thanks!
  2. Gav2k macrumors G3


    Jul 24, 2009
    You have two choices charge to 100% then use the batter till warned to plug in or charge it all the time. Either way the battery will die soon enough. Just try to avoid constantly charging from half way etc as it will effect things over time even though the battery downt suffer the memory effect.
  3. Prhymeate macrumors member

    Jan 31, 2010
    From the FAQ page:

    Q: My battery shows XX% health in Coconut Battery. Is that normal? What can I do to keep it from decreasing more.

    A: It is normal for batteries to lose capacity over time. According to Apple your battery should last 3 years and 300 cycles before it drops below 80% if you have a removable battery, or 1000 cycles before it drops below 80% if you have a non-removable battery. The best thing to do to maintain your battery is to use it and keep it cool. If you just leave your computer plugged in all the time, the battery sits at 100% (or near 100%) charged, which slowly causes damage. Heat also slowly causes damage, so make sure the battery stays cool and has plenty of airflow. Try to avoid using your MBP on soft surfaces that can block airflow and trap heat. It will help to put your computer in sleep mode overnight rather than leaving it on since that keeps it cooler. Finally, be sure to calibrate the battery occasionally (see Apple’s site for instructions).
  4. cokeb macrumors newbie

    Aug 10, 2007
    I don't know about the MBP, but I've had my 2007 Macbook almost constantly plugged in. I've consciously calibrated it maybe 5 times in these years.

    Coconut Battery says 178 cycles, 98% of original capacity. :)
  5. jaljupp macrumors newbie


    Feb 1, 2010
    could we connect iPhone with other blue tooth device ?


    could we connect iPhone to other blue tooth device such as nokia mobile , bluetooth sticker and so on ?
  6. Dozerrox macrumors 6502

    Dec 23, 2009
    Sorry, but this is wrong, with the current generation of batteries it does more harm to run it all the way down and charge to full. You should only do this now and then to calibrate the battery.

    The best way I believe is to just use the battery fairly regularly, but not totally empty it, then to do a calibration (empty and refill) once every month or two.

    Personally though, I'd just use it how you like and not worry about it.
  7. moel macrumors 6502

    Nov 7, 2007
    jaljupp thats not really relevant to this post but the answer is no

    and best option on the battery front is to keep it plugged in all the time, as far as i'm aware once the battery is charged it is no longer fed power unless it drops again.
  8. Dozerrox macrumors 6502

    Dec 23, 2009
    It does drain though, so it will slowly drain a bit, charge a bit. As noted already, it's best to not leave it plugged in all the time.
  9. miles01110 macrumors Core


    Jul 24, 2006
    The Ivory Tower (I'm not coming down)
    The best way to preserve it would be to not use it at all. Keep your computer powered off at all times.
  10. m85476585 macrumors 65816

    Feb 26, 2008
    Here's my grandma's battery preserves recipe.
    *I am not responsible if something catches fire while attempting this recipe.

    On a more serious note, lithium-ion batteries like to be stored in a cool, dry place at about 50% charge. Your computer is a warm place, and it keeps the battery at 95-100% charge if it's plugged in.
    See figure 1 at this link:

    Since there's no way to stop the battery from charging to 100%, the best thing you can do as far as I can tell is use the battery regularly. Using the computer on battery every day even for just a bit should help the battery last longer. Eventually the capacity will decrease due to cycle count, but the new batteries are rated for 1000 cycles, which will last something like 6 years if you use 1/2 cycle per day.

    It is relatively easy to keep the battery cool. I keep my laptop on an aluminum cooling pad that I made my self. It consists of a bunch of square aluminum tubing bolted together, and it keeps the CPU 10 degrees C cooler than if it was on the desk. SMCFanContol helps, as does putting the computer to sleep at night.
  11. ttttttttttt9 macrumors member

    Jan 20, 2010
    I can say from experience that the battery will definitely last longer if you take it out while working on AC power. Since most modern laptops stop charging/messing with the battery after 100%, the main problem is just the heat the battery is exposed to sitting inside the machine.

    The downside is that MBP batteries are not really the easiest to quickly or routinely remove/insert in this way. Also you of course run the risk of yanking the power cord and losing everything. I circumvented the latter by cutting the head off an ethernet cable and taping it to the head of the power cord. Ghetto I know but it works! The adjacent ethernet plug "clicks" into the jack and holds the power cord in place.
  12. m85476585 macrumors 65816

    Feb 26, 2008
    MBPs clock the CPU down to 50% if there is no battery present. It doesn't make a lot of sense to me, but they must have a good reason to do that.
  13. Habitus macrumors 6502a


    Feb 26, 2009
    Where ever my life takes me...
    I always leave my MBP plugged in. My Mac is about 8 months old with a 96% capacity.

    Habitus :apple:
  14. Winters macrumors member

    Jan 11, 2010
    If you keep your mbp plugged, just don't forget to calibrate your battery once every month and your battery should be fine for a few years with minimal capacity loss.
  15. m85476585 macrumors 65816

    Feb 26, 2008
    I leave mine plugged in most of the time, and I'm on my third battery in a year and a half.
  16. Winters macrumors member

    Jan 11, 2010
    There is probably something wrong with your mbp. Or are you using some old powerbook ?
  17. m85476585 macrumors 65816

    Feb 26, 2008

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