[Q] USB host mode max current supply

I thought it is a common question to ask how much current can a mobile device that supports USB host mode deliver at max, but I couldn't find any satisfying answer. I know traditional USB port on PC can usually deliver 500 mA at max, tablets or mobile devices that support USB host mode or OTG functionality may possibly cannot supply that much current.

Do you have any idea how much current a tablet, say Samsung Galaxy Tab, can deliver current at max? It may depend on brand and model. If so, can you please give me some examples?

I am gonna buy mobile RFID reader however, that module can draw current up to 500mA, around 2.5 Watts, and wondering if tablet can supply that much or not..

Any ideas greatly appreciated

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