USB charger and battery

Anyone have info on a USB charger/battery combo unit?

Looking for one with a standard power supply (wall wart)
that would both charge an ipad as well as its own internal battery.



I used to have an old iSound unit which did this.

For iSound iPhone iPad Micro Mini USB Portable Charger - DGIPAD-4543 - Rakuten.com


Have looked around with no luck so far.

Ideas?

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