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IPad-3 Charging from my Laptop through USB cable

Discussion in 'iPad 3 Forum' started by rajatnanda, Jun 28, 2012.

  1. rajatnanda
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    rajatnanda iPF Noob

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    Hi, my IPad-3 does not get charged from my Laptop, whereas, it only gets charged through 10W power cable. I would appreciate if anybody could give me the reason for not charging. Thanks
  2. KevinJS
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    KevinJS Super Moderator Staff Member

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    USB does not supply sufficient power to charge the iPad. It will charge very slowly, but the charging symbol will not show up.
  3. KevinJS
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    KevinJS Super Moderator Staff Member

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    I should add that USB3.0 supposedly supplies enough power, but my computer only has USB2.0, so I can't vouch for that.
  4. rajatnanda
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    rajatnanda iPF Noob

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    hi Kevin, thx for yr advice. when I charge my IPad thru my Laptop, it just write on the top right corner Battery sign 'Not Charging'. It means, it does not get charged.
  5. KevinJS
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    KevinJS Super Moderator Staff Member

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    You will always see "Not Charging" when the iPad is plugged into USB2.0, however it will charge sufficiently to maintain charge, or at least slow down the discharge. Eventually, it might even fully charge, but it is going to be a slow process, even if you have the screen turned off.
  6. rajatnanda
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    rajatnanda iPF Noob

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    thx, Kevin.
  7. LeonKaiser
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    LeonKaiser iPF Novice

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    USB 3.0 port here. But not charging. Any luck with others here with USB 3.0?
  8. Dougsap
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    Dougsap iPF Noob

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    When charging using USB 3.0 from my HP DV7 laptop:
    • SYS Activity Manager Plus indicates that it IS Charging
    • The screen battery indicator says "Not Charging"
    iPad Charging on USB 3.jpg

    SYS Activity Manager Plus (for Memory, Processes, Disk, Battery, Network, Device Stat & Performance Monitoring) is one of the relatively few paid apps that I have bought yet (and well worth the 99 cents).
  9. ckmerc
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    ckmerc iPF Novice

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    There is an adapter cable for cheap on amazon that "upgrades" to allow for USB 3.o charging.....works with stock ipad cable. $7

    BoxWave iPad Charging Adapter, Allows You To Charge Your iPad 3/iPad 2/iPad on ANY Computer or USB Hub for Compatibility With Generic Chargers

    Works great
  10. LeonKaiser
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    LeonKaiser iPF Novice

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    Hmmm. Interesting. Does the battery percentage increase over time?
  11. iDeviceGuru
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    iDeviceGuru iPF Novice

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    USB ports don't produce a high enough output voltage for the iPad to recognise a charge, all the USB port is really for is the transferring of data, USB 3.0 is the faster that 2.0 for obvious reasons, think about it this way, the iPad has a 11,000 mAh battery, most laptops are around the 15,000-25,000 mAh range, with your laptops charger input being about 5v the laptop would loose charge almost instantly trying to charge an iPad.

    The iDevice Guru
    Last edited: Jun 30, 2012
  12. Gabriel1
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    Gabriel1 Super Moderator Staff Member

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    I could be wrong but I think that you are confusing mAh with Watts?

    The Archangel
  13. iDeviceGuru
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    iDeviceGuru iPF Novice

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    Indeed you are correct, I just noticed this as well! I was just posing on a topic to do with watts and just got mixed up, thanks tho!
  14. Dougsap
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    Dougsap iPF Noob

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    To answer your question, I did an experiment.

    I plugged my New iPad with 64% battery life indicated into my USB 3.0 port. I changed the power settings on my laptop to not 'go to Sleep'.

    After 5 hours charging on USB 3.0, the Battery Indicator showed 79% (or an increase of 3% per hour).

    USB 3 Test.jpg

    So, a very rough estimate of how long a full charge would take is 30 to 33 hours.

    Conclusions:

    • Recharging on USB 3.0 is slow (no surprise)
    • SYS Activity Manager Plus' estimated recharge time is not correct for USB 3.0 charging (no surprise)
  15. LeonKaiser
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    LeonKaiser iPF Novice

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    That's great. Now we have solid proof that USB 3.0 does charge the new iPad.

    I did the same thing you did, this time with USB 2.0. The new iPad indicated "not charging," but after 1 hour and with the screen turned off, i got a 5% increase, from 35% to 40%.
  16. Bosvaark
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    Bosvaark iPad Enthusiast

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    It's not the voltage , but the ampere rating is too low on a USB port, it requires 2 amps 10watts to charge IE: more power, that's why it takes so long is it is trying to trickle charge the iPad.

    Some USB 2.0 ports and accessories do not provide enough power to charge iPad. When this occurs the message "Not Charging" appears in the status bar next to the battery icon.

    On most USB ports the power spec is 100mA ,unless the device is configured for high power(charging port), then it is 500mA. The mother board bus voltage is 4.75v to 5.25v.

    Laptop power supplies range from 15-20 volts and 3-7 amp rating depending on the size of laptop.
  17. iDeviceGuru
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    iDeviceGuru iPF Novice

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    Yes...? Are you trying to make a point or have a just missed it?

    The iDevice Guru
  18. Bosvaark
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    Bosvaark iPad Enthusiast

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    I was correcting what you said in your post as it is misleading.

    " USB ports don't produce a high enough output voltage for the iPad to recognise a charge"
    Incorrect : voltage is constant its amps that increase charging rate , in this case 100ma on a standard USB port is not enough hence the trickle charge


    "with your laptops charger input being about 5v ...."
    Incorrect : Laptop power supplies range from 15-20 volts not 5V
  19. Goavs18
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    Goavs18 iPF Novice

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    My Ipad3 charges through my MBP, I dont know the rate but it does charge and shows charging with the lightning bolt through the battery icon.
  20. coolstuffs
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    coolstuffs iPF Novice

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    The ipad charger is guaranteed to supply your ipad a maximum energy of 10 watts at an operating voltage of 5V and a current of 2 amperes. That is 5V x 2 A = 10 W.
    According to Wikipedia, USB 2.0 port operates at a voltage range from 4.75 - 5.25 V and the maximum current that can be drawn is 0.5A. Assuming a 5V operation, the
    maximum energy that the USB 2.0 port can give is 5V x 0.5A = 2.5W. This is very small compared to the 10W given by the charger. It will charge your ipad but it will take
    a long time to get a full charge condition. If you have USB 3.0 according to Wikipedia, it operates at 4.45 - 5.25 V and can supply a maximum of 0.9A. Again assuming a 5V
    operation, the usb 3.0 port can supply energy at 5V x 0.9A = 4.5W. This is much better compared to usb 2.0 but is less than that of the charger.

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