1. Are you ready for the Galaxy S20? Here is everything we know so far!

Support Would a dual-usb cable charge this thing?

Discussion in 'Android Devices' started by reiththestud, Feb 24, 2011.

  1. reiththestud

    reiththestud Android Enthusiast
    Thread Starter

    I remember back in the day they used to use these double-usb cables to provide extra juice to high powered devices. Would something like this be able to feed the Xoom's extra power draw?

    Newegg.com - BYTECC 3 ft. USB 2.0 Y cable, A male x 2 to Mini B male x1, for 2.5" Enclosure or USB2.0 Hub Model USB2-HD201

    Obviously you would need a mini-usb version or an adapter, I'm just asking if it would work "in theory".

    Edit 1: The reason I ask is because one of the reviews said that the dock charges the xoom via USB, not a power connector. So I guess they're just pumping more juice through the USB than is normally capable. Hey, maybe an iPad power brick would do the trick. Anyone have an iPad power brick they can try?

    Edit 2: Here's a cable for micro-usb connections: http://www.newegg.com/Product/Product.aspx?Item=N82E16812200832&cm_re=2x-_-12-200-832-_-Product


  2. james_bw

    james_bw Newbie

    The dock does NOT charge through the USB. It's not a question of current, it's a question of voltage. Don't bother with a different USB cable, it won't charge, it's not even connected to the battery that way.
  3. reiththestud

    reiththestud Android Enthusiast
    Thread Starter

    So the dock has the same power connector as the ac adaptor plug?
  4. reiththestud

    reiththestud Android Enthusiast
    Thread Starter

    Look here, no power connector on the dock
  5. james_bw

    james_bw Newbie

    See those two pins on the dock? They touch two pogo connection points for charging the device.
  6. reiththestud

    reiththestud Android Enthusiast
    Thread Starter

    Okay, I assumed they served a different purpose since motorola already had one power connector on the device. Doesn't make much sense to have two. Not entirely sure why they did it that way.
  7. james_bw

    james_bw Newbie

    Just for mechanical reasons really.
  8. syntrix

    syntrix Android Expert

    OP, no.

    Someone reported the charger is 7.4v. Usb is ~5v. So dual usb would still be usb spec, just 5v still.
  9. Go Blue

    Go Blue Newbie

    The output voltage on the wall charger included with the Xoom is 12v. USB is 5v.
  10. railrode1

    railrode1 Newbie

    It's the battery that's 7.4v . that's why no usb(5v) charge.
  11. Go Blue

    Go Blue Newbie

    Agreed -- a 7.4v battery (or anything in the 7 to 9 volt range) would usually be charged on a 12v circuit +/-. Typically a battery that is charged on the 5v USB circuit will be 3.2v +/-. Point is that a 5v USB charging circuit cannot sufficiently charge a 7.4v battery, and that is why a higher voltage charging circuit is required, and also why there is no connection to the battery from the USB circuit.
  12. papermonkey01

    papermonkey01 Well-Known Member

    Plus I doubt having that thin little power plug sticking up would be very sturdy. The mini USB port is delicate enough

Share This Page