Can the iPad charge via USB?

Discussion in 'iPad' started by mrsir2009, Oct 20, 2011.

  1. mrsir2009 macrumors 604

    mrsir2009

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  2. garybUK Guest

    garybUK

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    #2
    Yep, that's how it charges though the USB connector, however if your using a PC with a lower power USB port, it might not charge the iPad.
     
  3. ryanmcv macrumors 6502a

    ryanmcv

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    #3
    Depends on the computer you're using. My 2011 MBP charges my iPad via USB, but my older Dell laptop does not. I'm guessing it has something to do with the power output of the USB ports.
     
  4. mrsir2009 thread starter macrumors 604

    mrsir2009

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    #4
    Would a iBook G3 charge the iPad, even slowly?
     
  5. iParis macrumors 68040

    iParis

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    #5
    I highly doubt it. Heck, it may not even recognize it, considering how old the iBook G3 is. If your computer does recognize it, your iPad will indicate it's plugged in but won't charge, you'll see a "Not charging" statement next to the battery icon.
     
  6. mrsir2009 thread starter macrumors 604

    mrsir2009

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    #6
    Why would it need to recognize it to charge it? Wouldn't it charge it as long as the USB port is supplying power? My cellphone charges on the iBook G3 :confused:
     
  7. gr8tfly macrumors 603

    gr8tfly

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    #7
    It needs at least the high-power (1A) ports to charge (on later model MB/MBP, late 2008 and newer, if I remember the cut-in dates correctly). Even at that, it charges at about half the rate of the 10W adapter that ships with the iPads (1A@5vdc=5W).

    (Standard USB power provides 500ma, which is 2.5W at 5vdc.)
     
  8. AllieNeko macrumors 6502a

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    #8
    No, the iPad does not charge on "standard" USB. Standard USB allows up to 500mA current draw. USB smartphone chargers (which indicate what they are to the device by having the data pins shorted together) allow 1A current draw. The iPad draws 2.1A when charging. Modern Macs are designed to handle this and know how to talk to the iPad to tell it that's okay. A few rare USB chargers also do. Most devices with USB ports do not, however.
     
  9. mrsir2009 thread starter macrumors 604

    mrsir2009

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    #9
    Right, so I can't charge the iPad on anything such as solar USB chargers or anything like that either? :(
     
  10. StuB macrumors newbie

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    Nov 27, 2007
    #10
    If you can, try it and see.

    On my work laptop (a dell), when conencted to USB and in use the ipad displays not charging.

    But put the iPad in standby and it does actually charge, albeit at a trickle.

    It seems I have enough power from the USB on the dell to maintain battery levels while the iPad is in use, but only trickle charge when in standby.
     
  11. mrsir2009 thread starter macrumors 604

    mrsir2009

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    #11
    Ok, cool, trickle charging or maintaining battery life is enough. You see, I get frequent power cuts, so being able to charge my devices via solar power & other batteries is very convenient.
     
  12. Kenjhee macrumors regular

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    Jan 30, 2011
    #12
    Regarding the literal question, isn't USB connection the only way to charge an iPad? What power source is used is another question.

    Responding to the solar issue, I actually have played around trying to solar charge an iPad. I used a very minimal solar panel, the kind you fold up and carry in your pocket. I found it will charge my Gen 1 iPad about 20%, but that's all. Still impressive, though, considering the power requirements of such a big, bright display. I imagine a somewhat larger panel might do it quite well.
     
  13. mrsir2009 thread starter macrumors 604

    mrsir2009

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    #13
    How do you mean it will charge your iPad 20%...? Do you mean it will charge it to 20% battery capacity?
     
  14. AllieNeko macrumors 6502a

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    #14
    The iPad charging is intelligent and will use what power's available, I should have been more clear. I believe even a 500mA source (most computers) WILL, very slowly, charge a sleeping iPad (though they aren't enough to even power a running iPad and the battery will slowly drain).
     
  15. mrsir2009 thread starter macrumors 604

    mrsir2009

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    #15
    Cool, thats enough. Thanks.
     
  16. zaxdude macrumors regular

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    Mar 11, 2011
    #16
    I installed the free Asus Ai Charger software on my Dell laptop. My ipad charges quite nicely through USB on it now! :)

    Asus Ai Charger
     
  17. takeshi74 macrumors 601

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    Feb 9, 2011
    #17
    Not all do. Always check the specs on the specific charger.

    No. An AC charger is not, literally, USB. It may have a USB connector but it's still not USB.
     
  18. poloponies macrumors 68030

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    May 3, 2010
    #18
    I have a Joos Orange solar charger/battery which works very well with my iPad and iPhone.
     
  19. darngooddesign macrumors G3

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    Atlanta, GA
    #19
    This has a cigarette lighter jack that I can power other items with.

    http://www.autozone.com/autozone/ac...2629?itemIdentifier=193250&_requestid=2912619

    But beyond that, its a good thing to have in your car.
     
  20. poloponies macrumors 68030

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    #20

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