By design, iPad will not charge through USB ports on non-Apple computers. iPad charges just fine through the wall charging brick and accompanying USB data cable. The iPad charges just fine when connected to USB ports on iMac, MacBook Pro. However the non-Apple as a whole have a problem.
The iPad does not charge correctly when connected to a PC.
The iPad does not charge correctly when connected to an older MacBook Pro.
The iPad does not charge through USB hubs, regardless of what the hub is connected to (PC or Mac)
The BG-UAI adapter has been designed to solve the USB power with an inexpensive solution . Simply attach the BG-UAI adapter to your existing Apple charge/sync cable and your iPad will charge from your computer's USB port. The BG-UAI charges the iPad using the available USB port on the user's computer.
Plug and play
Charge your iPad via.PCs/Notebooks/Netbooks
Plug to any USB AC/DC charger to charge your iPad