In-Box Power cord used when exactly?

Discussion in 'MacBook Pro' started by mac000, Dec 24, 2006.

  1. mac000 macrumors 6502a

    Joined:
    Sep 6, 2005
    #1
    I'm wondering what exactly that power cord that comes along with mbp is user for? Not the power brick, but the other power cord. I'm running my mbp in clamshell most of the time, so am i suppose to pop that battery out and use that 2nd power cord in addition to the power brick? -thanks
     
  2. mkrishnan Moderator emeritus

    mkrishnan

    Joined:
    Jan 9, 2004
    Location:
    Grand Rapids, MI, USA
    #2
    If you look at the place where the white brick of the power supply has the prongs to plug into the wall, you'll notice that this segment is removable. If you pull it out, you can replace it with the longer cable if you...erm... need a longer power cable. That's really about it. That, and it has a grounding prong in the US (whereas the little adapter doesn't).

    EDIT: The part in the upper left of this picture is removable and gets replaced with that power cord.

    [​IMG]

    When you do this, it looks like this:

    [​IMG]
     
  3. mac000 thread starter macrumors 6502a

    Joined:
    Sep 6, 2005
    #3

    oh i see - so its just an extension.

    Well to answer my other question, if im' not going anywhere with my mbp laptop am i suppose to pop the battery out while its just sitting there in clamshell? - im talking about it sitting there for days.
     
  4. smartalic34 macrumors 6502a

    smartalic34

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    May 16, 2006
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    USA
    #4
    it's perfectly fine to leave the battery in all the time
     
  5. orangemacapple macrumors 6502

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    Sep 1, 2006
    Location:
    Raleigh
    #5
    Overkill

    the airport express also uses the same brick design and power cord, but there is no power cord included with it. the cord from the power adapter fits it.

    still can't figure out why it has a ground plug on the cord but not on the appliance. nor can i figure out why the extension cord is of such a heavy-duty design for no more power than it draws.
     
  6. mkrishnan Moderator emeritus

    mkrishnan

    Joined:
    Jan 9, 2004
    Location:
    Grand Rapids, MI, USA
    #6
    True... but it does come in handy sometimes. I have two iBook power supplies. One of them usually lives in my office for when I bring my iBook there. The other one has the long power cable on it and plugs into my iBook at home. The plug point itself is hard to access. But if I want to take it with me, I just unplug it at the brick and replace the short one.

    *shrug* It's a bonus. You certainly need not *ever* use it if you do not wish to.
     
  7. dornoforpyros macrumors 68040

    dornoforpyros

    Joined:
    Oct 19, 2004
    Location:
    Calgary, AB
    #7
    it's just an extension cord which I'm glad they include, I haven't even taken the plastic off the original attachment, I popped it off the brick, attached the extension cord and haven't removed it since. I suppose I might switch back when I fly tomorrow just so I'll have less crap in my laptop bag. But over all I'm glad it's there.
     
  8. idea_hamster macrumors 65816

    idea_hamster

    Joined:
    Jul 11, 2003
    Location:
    NYC, or thereabouts
    #8
    Not only is it OK to leave the battery in all the time, it's my understanding that it is preferable to do so.

    I think the battery acts as a buffer for variations in voltage that can affect performance, since the laptop does not have a full-blown power adapter like a desktop.

    Of course, I don't have a reference, so this is just what I believe to be conventional wisdom. (Ergo, it could be pure weapons-grade bolongium....)
     
  9. mkrishnan Moderator emeritus

    mkrishnan

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    Jan 9, 2004
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    Grand Rapids, MI, USA
    #9
    Even with Safe Sleep, it's certainly preferably to have a battery in if there is a power outage! :)
     
  10. ravenvii macrumors 604

    ravenvii

    Joined:
    Mar 17, 2004
    Location:
    Melenkurion Skyweir
    #10
    Speaking of battery removal, I once foolishly removed my battery while my laptop was in sleep mode (I forgot it was on). D'oh! I put the battery back in, flipped the laptop, opened it up and sure enough it's off. BUT! When I hit the power button... it woke up from sleep!

    Talk about cool!
     
  11. idea_hamster macrumors 65816

    idea_hamster

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    Location:
    NYC, or thereabouts
    #11
    True -- it seems that Mac (and possibly other) laptops are designed to allow a battery swap during sleep without shutting down.
     
  12. MacsAttack macrumors 6502a

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    Jul 2, 2006
    Location:
    Scotland
    #12
    That extension came in real handy the other week. Plug in the hotel room was too close to the desk top to allow the brick to plug in (three pin UK plug - can the two-pin sockets be used wither way up????).

    With the extension however I still had power and could recharge both my MacBook and my iPod :D
     
  13. poppe macrumors 68020

    poppe

    Joined:
    Apr 29, 2006
    Location:
    Woodland Hills
    #13
    I have never found one moment yet since I got my Mac in November to acctually use the little piece that pops in the brick. Every single time I've tried I've found my self getting to far and the Mag safe popping out..
     
  14. mkrishnan Moderator emeritus

    mkrishnan

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    Jan 9, 2004
    Location:
    Grand Rapids, MI, USA
    #14
    In the PowerPC era, only the 15" and 17" Powerbooks can do this. I'm not 100% clear on which Intel-based ones can do this. But any new Mac laptop should safe sleep, I think?
     
  15. Silentwave macrumors 68000

    Joined:
    May 26, 2006
    Location:
    Gainesville, FL
    #15
    This is true, and critical! Removing the battery locks the processor at its minimum speed of 1.0GHz!

    Also, if possible, use the extension cord. It has a ground plug, unlike the flip one.
     
  16. techster85 macrumors regular

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    Oct 17, 2006
    Location:
    Lubbock, TX
    #16
    does it limit the processor because of power demands?
     
  17. iW00t macrumors 68040

    iW00t

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    #17
    Since the AC adapter is capable of powering the computer going at full juice and charge the battery at the same time, I doubt removing the battery would somehow affect the power adapter's capacity ;)

    Probably some engineering decision though.
     
  18. mkrishnan Moderator emeritus

    mkrishnan

    Joined:
    Jan 9, 2004
    Location:
    Grand Rapids, MI, USA
    #18
    Not to mention that, if the battery were being called upon to help supply power because there was not enough available power, then how could the notebook work for hours on end? :)

    But anyway, others have reported it as a bug. It might just be some subtlety of Intel's power management that has not fully been correctly implemented in the OS X kernel extensions.
     
  19. orangemacapple macrumors 6502

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    Sep 1, 2006
    Location:
    Raleigh
    #19

    i don't think the ac adapter is powerful enough to power the machine and charge the battery. i can start with 100% and within a few minutes of moderate use, the battery reads 98% +/-. quit using the machine and it recharges to 100%. that says to me i need to get an 85 watt mbp supply for my mb.
     
  20. jsw Moderator emeritus

    jsw

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    Mar 16, 2004
    Location:
    Andover, MA
    #20
    And that is why you should use it.
     
  21. orangemacapple macrumors 6502

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    Sep 1, 2006
    Location:
    Raleigh
    #21
    reason for ground plug

    the reason for a grounding prong on the extension cord is SAFETY.
    if some baby or pet started playing with the thing and slobbering all over it they might get electrocuted with the prong there. it's not an issue when the cube is plugged into the wall because it's much more difficult for a baby to slobber or spit-up on it there
     
  22. nitynate macrumors 6502a

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    Jan 22, 2006
    Location:
    Clearwater, FL
    #22
    Always use the ground.

    If you want to be alive.... :)
     
  23. Silentwave macrumors 68000

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    May 26, 2006
    Location:
    Gainesville, FL
    #23
    Nope. Like idea_hamster said, it is a buffer for voltage variations that can damage the processor.
     
  24. e12a macrumors 68000

    e12a

    Joined:
    Oct 28, 2006
    #24
    If you receive slight shocks from your MBP, try putting the three pronged cable on.
     
  25. poppe macrumors 68020

    poppe

    Joined:
    Apr 29, 2006
    Location:
    Woodland Hills
    #25
    I think this is incorrect. I constantly run my battery dry at class. Then come back home and start editing with FCP and almost the same charge times as when it is asleep it is completely charged..
     

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