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Most Android devices have a single port for both connecting to the computer (USB) and charging. I have to use this OTG small cable to transfer data, but also to use a real keyboard. However, when I connect the keyboard, I cannot recharge my device while I work. Since they both use the same port, is there a way to split an OTG cable to introduce power on it, but keep the existing port so I can connect a keyboard ?

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possible duplicate of USB charging in host mode –  Flow Dec 1 '12 at 9:23
    
The linked answer has a VC with this as dupe already. Loop... –  ce4 Dec 1 '12 at 10:11
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up vote 6 down vote accepted

Yes, it is possible, at least technically. What you need is a cable called a OTG host cable with power, which is a double-female cable with a male micro, a female micro (which only has the power and ground connected, no data), and a female A, like this one.

Additionally, you also need software support. I know an appropriate kernel patch is available for CM10 on the Nexus 7 (here), but I don't know about any other devices.

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