Any electronics wizards here?

[EDcase]

I have an action cam which can be powered by an external battery using USB but I also have a mic that uses the same USB socket.I'd like to make a connector that allows both at the same time.I have the ability to make this connector but not sure if connecting the pins might damage the camera.The battery will use pins 1 and 5 for power.But the mic uses pins 1 and 2 so would that damage -data line 2?I assume I'd need a diode on the mic positive to prevent current leaking through it?I think the mic measures 948 Ohm resistance.Thanks for any help

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