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How good is the power regulation on a RPi 2 ?

I have a small robot controlled by an RPi2 and some Arduinos, and have two choices to power it (the Pi, that is). I can make a dedicated 5V regulated rail with a small 3A DC-DC converter, or I can feed the 7.4V from the batteries to the Pi. The batteries will have servos (via another regulator) running off them, possible not a real clean source, but maybe OK with the other 5V regulator for the servos there.

My other question is power related too. How can I stop the Pi from giving the Arduino power over USB? It really only needs to be a data connection and I'd rather supply the Arduinos off my own 5V rail than tax the Pi's USB.

Sorry about the two questions / post, they seem related.

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    If you feed the 7.4V from the battery to the Pi the question becomes moot, as you no longer have a working Pi. – joan Dec 5 '15 at 9:23
  • Ah, very sorry. I had thought the Pi had a regulator and provision for battery power, my mistake. – Robert Murphy Dec 5 '15 at 11:25
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    I use a UBEC in your situation. They will produce 5V suitable for the Pi and your servos. – joan Dec 5 '15 at 11:38

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