I charge on PC with Asus Ai Charger. I downloaded the driver and am able to charge the iPad with the lightning bolt showing that it is charging. I have a windows 7 pc.
--- In iPad@yahoogroups.com, "petefromflorida" <petefromflorida@...> wrote:
>
> Thanks for the explanation. I knew there was a difference between the different USB ports but didn't know what it was.
> Pete
>
>
>
> --- In iPad@yahoogroups.com, Charles Carroll <911@> wrote:
> >
> > USB1 only supplied 100mA *per port*. USB2 supplies current in 100mA
> > increments, up to a maximum of 500mA *per port*. the battery charging spec
> > increases this to 1.8A if the device is only charging and not communicating
> > (tho i don't know if that spec is part of USB2 or USB3). see
> > en.wikipedia.org/wiki/Universal_Serial_Bus#Power
> >
> > Since an iPad requires 2amps (2000 ma) basically the Lenovo or any WinTel
> > USB port can only provide 1/4th of its power requirement at best if it is
> > designed according to USB 2.x standards. The MacBook Pro/Air or USB
> > chargers don't follow the USB specs they can produce much more than 500ma.
> > (500 ma is 1/4 of 2000ma/2a the iPad requires). And this is a max not all
> > ports even put out 500mas if other devices are plugged in or just not fully
> > maxed out to the spec.
> >
> > The per port limit is why you might see USB cables that plug into 2 ports
> > top double the power output many external disk drives or devices that need
> > 1 amp (1,000 ma) come with these of cables that plug into 2 USB ports.
> >
> > http://www.bixnet.com/5vps2powercord.html
> > http://www.amazon.com/Utstarcom-Universal-Adapter-Female-Connector/dp/B0041CFFBM/ref=sr_1_1?ie=UTF8&qid=1338827152&sr=8-1
>
