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Support Charge Speed - USB vs. A/C

Discussion in 'Android Devices' started by Bing, Jul 21, 2010.

  1. Bing

    Bing Well-Known Member
    Thread Starter
    43

    Jun 1, 2010
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    Software & Systems Engineer
    Washington, DC
    For those who don't know, USB charging is a lot slower than A/C (wall outlet) charging. This thread goes into it well:

    http://androidforums.com/htc-evo-4g...-have-dramatic-difference-charging-times.html

    That said: anyone know a way to up the amps from a USB port? I'm especially interested for this in my car, where I have a USB port from my audio system, and would really like to charge my Incredible while I use it as a GPS.

    Any tips for this? I know "get a car adapter" is an easy solution, but I'd prefer avoid that if possible.
     

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  2. Divine_Madcat

    Divine_Madcat Well-Known Member
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    Apr 7, 2010
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    Computer Programmer
    USA
    Computers (and i would assume other equipment designed to work with computer equipment) are built to only put out 500mA. This is an international computer standard, and while annoying , no way to change it short of actually changing parts on a motherboard/etc.
     
  3. TylerM

    TylerM Well-Known Member
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    Mar 19, 2010
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    Rochester, NY
    Apple is able to charge over USB a lot faster because they don't follow standards.

    All of the newer macs are putting out above average power. This causes issues for those with iPads and PC's because since most motherboard makers follow standards, the iPad requires an extra boost of USB power. A lot of them ended up releasing new BIOS updates allowing more power.

    Even with a power boost, USB will not be as fast as a wall charger. You can search for custom BIOS if you wish but I would just stick to wall.
     
  4. yojoe600

    yojoe600 Well-Known Member
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    Apr 14, 2010
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    College Student
    NC
    most people know this based on trial and error... or just observing
     
  5. Minimike

    Minimike Well-Known Member
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    Jul 2, 2010
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    The computer is limited to 500ma un USB and even less if the device doesn't tell it it needs 'high power.' You can use a powered USB hub at home and get 1 amp out of it. Of course that solution won't work in your car without an inverter to power the hub.
     
  6. Lifeguard17

    Lifeguard17 Well-Known Member
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    Jun 2, 2010
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    Washington DC

    Another issue with mac cords is that they are designed to primarily be charged using the USB on your computer. The Adapter actually puts more current thru the cable charging your ipod/iphone faster, but the heat breaks down the cord faster. That is why they have an issue with a lot of returned cords
     

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