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Is this a feasible design for a powered usb cable?

I have a Nook Color that I've installed cm7 onto and I saw that with the Nook Tweaks app usb host mode was possible. So I immediately ordered a micro usb to female usb adapter which recently arrived upon its arrival i tried a few things and they worked fine but as I read on xda (forums where the nook development started) it could only supply 100mA current which is barely enough for a mouse and keyboard. What I was wondering was would a cable (possibly with a diode to stop a short circuit) that had a 5v 500mA power supply attached work to supplement the lack of power? I do know that I could just use a powered hub but I was looking for something that could (theoretically) be battery powered.
Thanks,
fusorx

frollard5 years ago
100mA is more than enough for mouse keyboard. What on earth do you want to connect to this thing?
fusorx (author)  frollard5 years ago
Well just the mouse (which is a little older) says it needs a full 100mA and the keyboard doesn't say. What I was connecting that didn't have enough power was a USB wifi dongle (in chrooted Ubuntu I tried to use it but dmesg reported not enough power) because the built in wifi chip has drivers that don't support monitor mode (and are said to be difficult if not impossible to patch). I just want to know if this is technically feasible.
Thanks,
fusorx
+100....