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ipad doesn't have enough power to run usb for any heavy
devices. so besides a camera kit adapter from ipad to usb
you usually need also powered usb hub.
This adapter doesn't need an extra hub, just needs to be
smart enough to understand what's happening with it. When
not in use (like file
transfer) it changes to filling up its own
battery. And voilla! (where DID I put my viola...)
CyberPower Mobile Battery Powered 4-Port USB Hub
Is this what you're looking for? [scad mientist, Feb 18 2014]
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||What the heck are you trying to connect to your iPad, a
USB powered lawn mower?!
||a hard disk, or a disk on key.
||See link. This was the first hit on Google for "battery power usb hub". Based on reading the reviews, it sounds like there is a switch on the device. In one mode it sounds like it works as you describe, charging the internal batteries from the USB host, and presumably using power from the batteries if there is too much current being drawn by USB devivces. In the other mode it draws no power from the host and drains its own batteries (a feature not included in your idea).
||From your description, I assume you may have had a smaller battery pack in mind, but 4 AAAs really isn't that big.
||I want a USB powered lawn mower, it would be ideal for mowing the green baize on my desk.
||so, it takes a scad mientist to prove that the idea
was a good one, but, as usual already baked, which is
also good, because halfbakers tend to halfbake only.