Power supply damaging battery

Discussion in 'MacBook Pro' started by sweetstyle, Oct 28, 2014.

  1. sweetstyle macrumors newbie

    Joined:
    Jan 30, 2013
    #1
    Does leaving a MacBook Pro permanently connected to a power supply damage the battery and reduce its life? Or is the equipment smart enough to prevent this?
     
  2. priitv8 macrumors 68020

    Joined:
    Jan 13, 2011
    Location:
    Estonia
  3. snaky69 macrumors 603

    Joined:
    Mar 14, 2008
    #3
    The power supply is just that, a supply. The computer knows how much juice to take in.
     
  4. poiihy macrumors 68020

    poiihy

    Joined:
    Aug 22, 2014
    #4
    No it will not damage it. If battery full then the system stops charging and just runs off tap power.
     
  5. skinny*k macrumors regular

    Joined:
    Feb 21, 2011
    Location:
    California
    #5
    No, but leaving the power supply plugged in when you're not using it will shorten its life; if its generating heat, its working hard for no benefit.
     
  6. poiihy macrumors 68020

    poiihy

    Joined:
    Aug 22, 2014
    #6
    It won't shorten it's life much. All you need to do is use it from battery once every few weeks. Heat will always shorten its life a little whether it's plugged in or not.
     
  7. nobodyjustwalks macrumors regular

    Joined:
    Jan 23, 2013
    #7
    Permanently?

    If, by "permanently," you mean leaving it connected to its power supply for the next three years, never unplugging your brand new computer until you decide to sell it? Yes, it will most likely damage your battery.

    If, by "permanently," you mean using it connected to your power supply more often than not, unplugging it once every few weeks or so? No, you will not damage your battery.
     
  8. skinny*k macrumors regular

    Joined:
    Feb 21, 2011
    Location:
    California
    #8
    If its always plugged in, it won't last as long, but whether that matters will depend on how long you intend to keep it. I'm not suggesting that they shouldn't be plugged in for powering the 'book, only that they be unplugged when aren't being used for charging or powering the 'book.

    They're a lot hotter when they're plugged in than when they aren't, and how long one will last is a crapshoot; they do die, and they are rather expensive to replace.
     
  9. nebo1ss macrumors 68030

    Joined:
    Jun 2, 2010
    #9
    There is the Theory and there is practice. My Macbook pro was plugged in 95 percent of the time after I got an Ipad because it rarely if ever moved from my desk. After 12 months of doing this I had at most 30 minutes battery life available when I tried to use it disconnected.


    I just bought a new battery and believe me I will be treating it very differently this time around.
     
  10. Sangoma macrumors member

    Joined:
    Dec 27, 2012
    #10
    Been running mine for over 3 years with power supply plugged in most of the time. Battery is still good.
     
  11. sweetstyle thread starter macrumors newbie

    Joined:
    Jan 30, 2013
    #11
    Thanks for all the replies, you've been most helpful...

    let me be the first "Merry Christmas"
     
  12. rmackner macrumors member

    Joined:
    Oct 28, 2014
    #12
    No it will not damage the battery by leaving it plugged into the AC adapter. But if you aren't at least taking the battery down to below 5% once a month it will definitely decrease the battery life.
     

Share This Page