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USB OTG Power supply

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Hey guys, hope you can help me out with a little noob question on OTG.

I don't know much about Hardware, so I want to ask first.

Is it possible to connect the red an black wire from the battery to the micro USB port to get power supply on the connected devices and if yes, is it possible to charge the phone with this modification applied, or will it be transformed to a different voltage? :confused:

Because if the 5V become maby 3.7V, I just have to install a switch between battery and USB port, so if i need to charge the phone I disconnect the power from USB and if I connect a pendrive I get the power back to the USB.

EDIT: I don't want to carry around a powered USB hub.

Thanks in advance, I'm looking forward to great answers. :rolleyes:

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