Is it ok to leave the AC plugged in all the time?

Discussion in 'MacBook Pro' started by macmee, Apr 21, 2012.

  1. macmee Suspended


    Dec 13, 2008
    I have a 15" MBP I got around Christmas. Right now I unplugged the battery and it's at 94% which is 5265 mAh (cycle count is 9 condition normal).

    I've Googled whether I am ok to always leave it plugged in all the time, if I should do full discharges or if I should do small discharges. I've seen a lot of people who never used their battery for 3 years and it's still going strong, and I've heard stories of people doing regular discharges and batteries only lasting 4 months.

    My question is, to maximise the life of my battery should I:
    - always keep AC plugged in whenever possible
    - do FULL discharges from like 100 to 10 percent once a week/month
    - do small (like 10%) discharges once a week/month

    Thanks :D

    edit: it says full charges are 5473 mAh, shouldn't that be 5600 :(
  2. heisenberg123 macrumors 603


    Oct 31, 2010
    Hamilton, Ontario

    No its not a great idea to leave it always plugged in
  3. user418, Apr 21, 2012
    Last edited: Apr 21, 2012

    user418 macrumors 6502a


    Aug 22, 2010
  4. 24Frames macrumors regular

    Mar 23, 2012
    I think that they automatically cycle (between 95% and 100%), so you can leave it plugged in. This would certainly be in Apple's interest, as it saves them money replacing dead batteries!

    This is I believe the case with iPad 3 (not sure about iPad 1 or iPad 2).
    But to be on the safe side why not simply follow Apple's advice on the matter.
  5. musty345 macrumors regular


    Feb 28, 2010
    United Kingdom
    I was just listening to the MacCast podcast, and Adam (the host) was talking about how he has used laptops as desktop computers (kept them plugged in all the time) and the batteries usually die after 2 years of use.

    From what I heard on the show, i'd advise charging to 100%, then letting it drain to around 30% and charging to 100% again and so on. If you need to store your computer for a while, charge it to 75% (this is what Apple does).

    What I used to like doing on my old Windows laptops was to take the battery out of the laptop and just keep it on the mains when I was using it as a desktop, but I don't think you can do this very easily/at all on MacBooks (I've never had one).

Share This Page