Swees 25600mAh power bank charging retina Macbook

Discussion in 'MacBook' started by spittingllama, May 25, 2015.

  1. spittingllama macrumors member

    Joined:
    Apr 6, 2015
    #1
    Hi all.

    Have been looking at this powerbank for the Retina MacBook. Anyone know if this will work ok via usb a to usb c?

    http://www.amazon.co.uk/gp/aw/d/B00TDGC9WY?vs=1

    Thanks
     
  2. KPOM macrumors G5

    Joined:
    Oct 23, 2010
    #2
    In theory, any of these power banks should work, but be aware that most of them put out only 10-12W of power, while the MacBook charger puts out 29W, so they will charge the MacBook much more slowly.
     
  3. cmagno macrumors newbie

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    May 22, 2015
    Location:
    Portland, OR
  4. nrubenstein macrumors 6502

    Joined:
    Aug 5, 2008
    Location:
    Washington, DC
    #4
    Honestly, in normal usage it's not even noticeable. I'm currently 12 time zones away from home and I didn't even bother bringing anything but my Anker 5-port charger. 12W is plenty for the MacBook. No, it doesn't charge as quickly, but that rarely ever actually matters. I plug it in in the evening, and the battery is full by the morning. (Actually a lot sooner than that.)
     
  5. Cvx5832 macrumors regular

    Joined:
    Nov 2, 2014
    #5
    I will second this. I use a 12w charger when I'm in my garage. I can make it not charge by draining it down to <15% where draw would be at maximum, brightness at max and encoding 4K videos where it gets so hot you see the processor throttling in the Intel Power Gadget.

    So it's possible the 12w is not enough, but unrealistic for my use case.
     
  6. headcase macrumors 6502

    headcase

    Joined:
    Jul 4, 2007
    Location:
    Raleigh, NC
    #6
    Just to clear, are we talking external batteries or chargers here?
     
  7. tutux macrumors member

    tutux

    Joined:
    May 4, 2015
    #7
    Just FYI, I have a anker power bank E7 25600mah.

    Power delivered to the macbook: 12W

    enough to charge/maintain the charge depend of the load of the macbook!
     
  8. mafaky macrumors regular

    mafaky

    Joined:
    Jun 12, 2014
    Location:
    Istanbul, Turkey
    #8
    Gentlemen, the "power rating" of the source is not the only factor involved in the charging of this 12" rMB.
    These external battery banks supply a stabilized voltage of 5.0Vdc (for the moment put their output current capacity aside...). The laptop needs to be charged with 14.5Vdc... Can someone explain as how a 5.0Vdc source can charge a 14.5Vdc load?:confused:
     
  9. xPad macrumors regular

    Joined:
    Dec 15, 2013
    #9
    5V will work just fine, just slower. This is part of USB 3.1.
     
  10. mafaky macrumors regular

    mafaky

    Joined:
    Jun 12, 2014
    Location:
    Istanbul, Turkey
    #10
    I know that USB-C port is not a standard DC port, but are you telling that once you input 5.0Vdc to the USB-C (USB3.1) port, the output is somehow increased to 14.5Vdc? Can you give a more specific link, describing this process???
     
  11. TBpnav macrumors newbie

    TBpnav

    Joined:
    Feb 23, 2016
    #11

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