Charging other devices by usb on the go

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http://forum.xda-developers.com – I'm not sure that i'm asking this in the right place but here is my question.i couldn't get an answer in Q and A section. I wonder if it's possible to charge other devices by connecting them to otg cable and charging them by phone battery power. Actually i want to know the max amperage which the usb connector on the phone can give?Can i connect my mw600 bluetooth headset to the phone and charge it(i usually carry my otg cable and phone charger in my bag)?I can test it but i don't want to do anything rash and damage my devices. thanks (HowTos)