When I used OTG cable, stuff I plug into it get power from my i747... In theory, I can charge other devices from my i747.
However, I suppose if the device connected to the i747 via OTG actually is hot (supplies power instead of getting power), it would then charge the phone instead...
Just a theory,.... A powered hub (with it's own power supply), might be able to charge the phone and power the devices connected to it... But a non-powered hub will get power from the i747 and power devices connected to the hub from the phone's battery... Do note that some devices require a certain amount of power to switch on and actually work... the power supplied by the phone is limited, so using a hub will divide the power across the connected devices to it...
Primary Phone: Samsung Galaxy S III i747M : Rooted, Stock --July 2012
Side Phone 1: Samsung Infuse 4G i997 : CarbonROM --December 2011
Side Phone 2: HTC Desire Z : CM9.1 by jerl92 --December 2010
Past Phones: Nokia C7 --December 2010 << Sony Ericsson X1 : Energy ROM --August 2009 << LG Xenon --July 2009 << Sony Ericsson w810i --July 2007 << Nokia 1100 --2006 << Nokia 3510 --2004 << Nokia 3310 --2003