Interesting iPad Charging Test

Discussion in 'iPad' started by Deamos, May 1, 2010.

  1. Deamos macrumors member

    Mar 25, 2009
    I did a quick test to see what is triggering the iPad not charging issue. I used my 2009 Macbook Unibody. OS is Snow Leopard and I used the newest VMWare Fusion to test on each OS.

    Test 1: iPad connected to Macbook running SL = Charging
    Test 2: iPad connected to Macbook running SL, USB connected to Ubuntu 10.04 guest Image = No Charge
    Test 3: iPad connected to MB running SL, USB connected to Windows 7 Guest Image = No Charge
    Test 4: iPad disconnected from VMWare guest OS's back to SL = Charging

    From what this sounds like, the charging issue is not a wattage program but is locked to the OS. Anyone else had any other results?
  2. Imidazole macrumors regular

    Apr 15, 2004
    Sounds like a software safeguard to prevent roasted USB ports.
  3. Deamos thread starter macrumors member

    Mar 25, 2009
    Possible. I would like to test a bootcamp image but I don't have any OS's set up like that. If anyone has W7 or Linux setup in bootcamp on a charging Mac would like to test and see if it still works, that would be awesome.
  4. ikdo macrumors newbie

    Sep 9, 2006
    I wonder if the 12v charger (for the firewire ipod) can charge the iPad?

  5. FirePak macrumors regular

    May 5, 2006
    Mesa Arizona
    Speaking of charging, Does anyone else notice when using like a Monoprice apple cable the charging takes much longer? When I use the apple branded cable its easily twice as fast.
  6. bperrella macrumors regular

    Apr 8, 2010
    Mine will not charge on my white MacBook (Mid 2007, 2.16 C2D) running Snow Leopard.
  7. OGDaniel macrumors 6502a


    Dec 24, 2009
    I did a test to see if the iPad would charge faster using a griffin cable and charger and an Apple one, and I even saw if the Apple charger w/Apple cable was faster than the Apple charger w/griffin cable, and the Apple things were always faster.

    As for the charging on the computer, my iPad doesn't even charge when plugged into the back of my iMac. I don't know what kind of circumstances are present with your computer but the iPad is only supposed to charge using the wall charger.
  8. alphaod macrumors Core


    Feb 9, 2008
    I got an update that Hypermac is making their batteries deliver the 10W needed by the iPad. Right now the charging is a hit and miss. So I might get their updated version.
  9. thatisme macrumors 6502


    Mar 23, 2010
    United States
    This statement is not correct. The iPad WILL charge using computer's USB ports, but they need to be full powered ports. I can charge just fine using my MBP Unibody 2008 AND my 2007 Aluminum iMac. I cannot get it to charge plugged into my keyboard's USB.

    It charges really slowly when the screen is on on the iPad, and fairly quick when the screen is powered down.

    I have noticed, however, that using 3rd party cables results in really slow charging, both off the computers and using the power adapter.
  10. santaliqueur macrumors 6502a

    Aug 7, 2007
    It may say "Not Charging", but I bet it is charging. I plug it into my Mac Pro, and it always says Not Charging. However, when I plug it in at night and wake up, it is ALWAYS at 100%. Even if it was at 15% when I plugged it in.

    "Not Charging" is not always accurate. It probably is charging with your iMac.
  11. nsdjoe macrumors member

    Apr 9, 2010
    This is correct. It says "not charging" but is in fact drawing a trickle charge on every USB port I've connected it to.
  12. Bierp macrumors member


    Apr 19, 2010
    This is interesting.

    I picked up a 6 foot USB extension cable to bridge from the wall adapter to the iPad cable. Mostly because any appropriate power sources are closer to the floor than I want my iPad. I'm concerned about the sluggish charging I seemed to be getting. Maybe i need to get that stray cable out of my setup.

    Does Apple make a longer 'official' cable?
  13. HiRez macrumors 603


    Jan 6, 2004
    Western US
    Can't you just use an extension cord between the charger block and the wall outlet, with the shorter USB cable? That should have no ill effect on the charge rate. USB was not made to carry power and signal over any kind of range, I'm not surprised it drops off.
  14. eTip macrumors 6502

    Mar 12, 2009
    I removed the smaller part of the Apple charger block (the part with the metal prongs) and replaced it with a "figure eight" cable, like this one:

    That gives me more than enough cable length without using a different or additional USB cable. Also, the plug stays in the wall socket better and leaves more room for other wall warts etc.

    If you don't have a figure 8 cable around (like from that old VCR or DVD player that you tossed out two years ago) then I am sure they are cheap on eBay.
  15. iRabbit macrumors 6502

    Jul 10, 2007
    same here... I notice this yesterday as well.... I plugged it into my Mac pro for a little while to sync and organize apps and it said "not charging" but it definitely did charge.

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