Stephen Lane wrote:
A std USB 2.0 Port has the capacity of 0.5A when configured as a High power port so if the load the idevice presents is less than this then the battery will charge slowly but surely. USB 3.0 Ports configured in High power mode have a 0.9A ability as std, still not enough to fully supply a iPad at full charging speed, however some motherboard manufacturers are beefing the ability of the USB3.0 Ports to charge the likes of the iPad (notably some of the Gigabyte ones)- an iPad charger is rated a 10W which at 5V means a 2A capacity.
Interestingly the output of the USB Ports can be paralleled & if you still have one of the old USB cables that has a 2 USB Plugs to single USB Plug/Skt that were popular when external drives came out offering a no wall wart option then you can double the charging current still not equal to the iPad charger but getting there. And of course if the iPad is off then it will charge little faster but again still not as fast a on the factory charger. Something to also note about computer USB ports is that they are intelligently monitored by the support electronics in the computer & if you try to overload one for too long it will be shut down (this stops the USB port from burning out thus requiring a new motherboard).
Regards
Stephen
--- In iPad@yahoogroups.com, julie.mavity@... wrote:
>
> I thought someone said we could charge our iPads from the USB of a computer but when I plug mine in to my laptop it says Not Charging. Is this normal? Thanks,
> Julie M-H
>
> Sent from my iPad
>
