Standard USB hub ports can provide from the typical 500 mA[2.5 Watts] of current, only 100 mA from non-hub ports. USB 3.0 & USB On-The-Go supply 1800 mA[9.0W] (for dedicated battery charging, 1500 mA[7.5W] Full bandwidth or 900 mA[4.5W] High Bandwidth).....