iPhone charges really slow with MBA but not iMac

Discussion in 'iPhone' started by Akuratyde, Aug 27, 2012.

  1. Akuratyde macrumors regular

    Joined:
    Feb 7, 2011
    #1
    I have an iPhone 4 that charges ridiculously slow when plugged into my Macbook Air (even when MBA is plugged in w/ full charge). I'm talking like 3-4 hours to fully charge. However, when plugged into my iMac at work it charges really fast, approx. an hour for full charge. Why is it different?
     
  2. Applejuiced macrumors Westmere

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
    #2
    Different USB power output strengths.
    On windows computers you can change that setting by using a program called ASUS AI Charger. Now I can charge my ipad 3 using my computers USB ports where before it displayed "not charging".
    Not sure about macs.
     
  3. Akuratyde thread starter macrumors regular

    Joined:
    Feb 7, 2011
    #3
    Right, I figured the USB ports were outputting power at different strengths. I'm curious as to why that would be the case though? It makes sense that they'd be the same across all Apple products but that's clearly not the case.
     
  4. Applejuiced macrumors Westmere

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
    #4
    Configuration or maybe the power supply used is not that strong to power up everything. The mac air is very thin so they have to make compromises.
     
  5. chambone macrumors 6502a

    chambone

    Joined:
    Dec 24, 2011
    Location:
    Netherlands
    #5
    No, it's not the case. My first gen MBA for example supplies 1 A though USB (because it needs to be able to power the optional optical drive) and my MBP only supplies 500 mA, charging my iphone at a slower rate. I wouldn't know about newer machines, but you can check how much power it gets in the USB section of system profiler or system info or whatever it's called when the phone is attached.
     

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