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Thread: USB charging

  1. #11
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    Quote Originally Posted by subtotal

    You need to look at the current output that specific USB port is capable of providing; the original USB standard (1.0/1.1/2.0) is for 500mA (900mA for USB 3.0).

    However with devices like the iPad and Galaxy Tab charging from USB, it is not uncommon to see USB ports capable of providing current up to 2.1A.
    Additionally, when using a device such as a powered USB hub, it is common to be able to draw up to the full current rating of the connected power supply.

    TLDR version: Charging off a USB port is limited by:

    1. How much current (Amps or mA) the USB port can provide.
    2. The maximum charging rate of the device.

    The point I was trying to make before, was that while these tablets can charge off of USB there seems to be something in the circuitry which limits the charging rate through the USB port that is not present on the DC socket.

    As far as how fast your battery charger can charge a tablet, look for an mA rating for the USB port, I'm guessing it will be either 1A or 500mA. At this level of current wire thickness is more about durability than current capacity.
    too bad, I usually have a usb cord on hand more then my adapter.

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  3. #12
    cb1
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    I am wondering if the Coby tablets limit the charging current on mini-USB port. I'd like to use an USB charger (AC plug with USB sockets) for travel which provides 2000mA - the same like the original AC adapter. As I didn't buy it yet - did anybody here try out already a charger with >>1A and compared the time for charging?

  4. #13
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    Quote Originally Posted by cb1
    I am wondering if the Coby tablets limit the charging current on mini-USB port. I'd like to use an USB charger (AC plug with USB sockets) for travel which provides 2000mA - the same like the original AC adapter. As I didn't buy it yet - did anybody here try out already a charger with >>1A and compared the time for charging?
    No matter what their seems to be a limit. If you charge by the usb cord it will take much more time. Best bet is to have a full charge when you start and then try to stay hooked into the usb when possible.


 
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