USB 3.0 supplies 5 V at up to 0.9 A ( 4.5 W ) .
Hosts conformant to the USB Battery Charging Specification can deliver up to 1.5 A .
USB 3.0 supplies 5 V at up to 0.9 A ( 4.5 W ) whereas hosts conformant to the USB Battery Charging Specification can deliver up to 1.5 A .