Battery Question for 2011 MBP

Discussion in 'MacBook Pro' started by redsaint182, Mar 25, 2011.

  1. redsaint182 macrumors newbie

    Feb 1, 2011
    New MBP user here. I love the thing so far:) What effect does leaving the MBP plugged in after a full charge have?

    So far, I charge it fully, take it off the charger, and run it on battery almost all the way (til about 10%.) Then I plug it up again, and repeat. But this way I use about 2 cycles per day (I use my laptop a lot.) I want to start running it on the plug sometimes, so I don't burn through so many cycles so quickly. But how much "on the plug" use is too much?

    On Apple's site, it says: "For proper maintenance of a lithium-based battery, it’s important to keep the electrons in it moving occasionally. Apple does not recommend leaving your portable plugged in all the time. An ideal use would be a commuter who uses her notebook on the train, then plugs it in at the office to charge. This keeps the battery juices flowing."

    Does this mean I can leave it plugged in for the majority of the time I'm using it - as long as I run the battery a little as well, enough to make sure the electrons "get some exercise?" I'm really cautious about this battery stuff because I ruined my Dell laptop battery. I left it plugged in too much.

    Thanks in advance!
    Take care.
  2. miles01110 macrumors Core


    Jul 24, 2006
    The Ivory Tower (I'm not coming down)
    Apple's explanation of "keeping the electrons moving" is not only vague, but has no basis in experimental fact. Electrons are always moving. It is perfectly fine to keep your MBP plugged in after your battery is fully charged. I've had batteries last years with very few charge cycles. I've also had batteries last years with many cycles.

    In the end, it's not worth worrying about. The battery "warranty" on the built-in batteries is very good. Odds are it won't even be an issue.
  3. ECUpirate44 macrumors 603


    Mar 22, 2010
  4. ThaDoggg macrumors 6502a


    Sep 26, 2010
    Peterborough, Canada
    I would just unplug it every 2 days and let it run down to like 10% then plug it back in. No need to do it as often as you are.
  5. redsaint182 thread starter macrumors newbie

    Feb 1, 2011
    Okay, thanks so much guys! I really appreciate the quick, helpful replies.

    Take care :)
  6. Derango macrumors regular

    Feb 25, 2011
    The general advice I've found is use it however the heck you want. Just try to at least run the battery down every month or so if you DO keep it charged fully most of the time.

    Lithium Polymer batteries are really robust and not much is going to damage it. Just use it how you want to.
  7. SamIchi macrumors 68030


    Aug 1, 2004
    Don't worry about it. If you don't move your laptop at all, leave it plugged in, and drain once a month is fine. I used to keep it plugged in 24/7 when i worked at home. Now I'm more out and about, I don't see any difference in "battery health"
  8. GGJstudios macrumors Westmere


    May 16, 2008
    This should answer most, if not all, of your battery questions:
  9. HBOC macrumors 68020

    Oct 14, 2008
    my battery health is at 100% after 4 weeks. I leave it plugged in 92.793% of the time.
  10. GGJstudios macrumors Westmere


    May 16, 2008
    Have you calibrated it? (And I'll bet you're exaggerating! You probably don't leave it plugged in any more than 92.789%! :D)

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