5 Replies Latest reply: Feb 6, 2012 8:47 AM by Texas Mac Man
cara_legault Level 1 Level 1 (0 points)

I am confused on what to do with my IPAD 2.  It won't charge via my USB Port on my PC that I travel with.  Also I just purchased a new desktop Mac and it will not charge on that USB port either.  But it will charge via the Wall Plug that came with it.  I am worried when I travel to different countries to use the wall plug.  I have an adapter to switch power.  I am from Canada and travel oversees where the power is 240 vs the 120 at home.  If I use my plug adapter and plug in my ipad to the wall Will I destroy the battey in my IPAD 2.  I love my ipad to travel with but it is very frustrating when it will not charge on my PC or on the airplane.  Then I am afraid to use the wall plug in the airport because of the difference in power.  Would really appreciate some help here because I am oversees 2 weeks a month and only get a couple days use of my IPAD.  I have all my books and everything on it and need to be able to recharge it.  Does anyone have any suggestions?



iPad 2
  • King_Penguin Level 10 Level 10 (115,340 points)

    The wall adapter is rated for 100 to 240 v (which I think covers every country), so you should just need an adapter for it and not a convertor.


    A lot of computers (especially older ones) generally do not provide enough power to their USB ports to charge the iPad at a sufficient rate - it may still be charging slowly, and should be a bit quicker if the iPad's screen is off (if you leave it for a while and then disconnect it from your computer you may find that it's battery percentage has gone up). The wall charger is usually the most efficient way to charge the iPad.

  • Network 23 Level 6 Level 6 (11,885 points)

    It's a little confusing, yes. Although it says Not Charging when you plug it into some USB ports, it should fill up when the iPad is sleeping.


    Macworld Magazine wrote a great article about iPad power requirements:


    It explains a lot.

  • Network 23 Level 6 Level 6 (11,885 points)

    King_Penguin wrote:


    The wall adapter is rated for 100 to 240 v (which I think covers every country), so you should just need an adapter for it and not a convertor.

    And for future reference, cara_legault, when in doubt about a device, always look closely at its power supply because electrical ratings should be stated on it. I just looked at my iPad adapter and "100-240V" is printed on it. Although Apple needs to print it in letters that are easier to read!

  • Michael Morgan1 Level 7 Level 7 (23,825 points)

    For better future reference, you should be aware that the voltage means nothing when it comes to charging power. All that that is telling you is that the Power Adapter will work across that voltage range, i.e., you don't need a transformer to plug it into the outlet (although you may need different plugs, which is a separate topic).


    What matters is the amperage (A) and the power in watts (W). The Power Adapter puts out 2 A @ 5 VDC (volts DC), which means it's producing 10 watts of power. It will output that across the entire voltage range.


    A high-power USB port on a PC will put out 0.5A @ 5VDC, or 2.5 W. Be aware that not all of the ports on any given PC are likely to be putting out even that much power, at may well be putting out less than half as much. That's why you'll often see the "Not Charging" when plugged into a USB port, especially on Windoze laptops, and why it will charge very slowly even when it works.


    FYI, the charger which is sold with the iPhone looks identical, is called the same thing, but only puts out 1A. It will work on the iPad but will charge more slowly. By that same token, the iPad charger will charge an iPhone just fine, it will just charge faster.

  • Texas Mac Man Level 8 Level 8 (46,555 points)

    The quickest way to charge your iPad is with the included 10W USB Power Adapter. iPad will also charge, although more slowly, when attached to a computer with a high-power USB port (many recent Mac computers) or with an iPhone Power Adapter. When attached to a computer via a standard USB port (most PCs or older Mac computers) iPad will charge very slowly (but iPad indicates not charging). Make sure your computer is on while charging iPad via USB. If iPad is connected to a computer that’s turned off or is in sleep or standby mode, the iPad battery will continue to drain.


    Apple recommends that once a month you let the iPad fully discharge & then recharge to 100%.


    At this link http://www.tomshardware.com/reviews/galaxy-tab-android-tablet,3014-11.html , tests show that the iPad 2 battery will charge to 90% in 3 hours 1 minute. It will charge to 100% in 4 hours 2 minutes.


     Cheers, Tom