OT, but I'd GLADLY trade 2-5mm of phone thickness for a longer-lasting battery; one that can still make it through a long day of heavy usage in a city with lots of interference to power over after the phone is a year old.
That's kind of the idea behind the Mophie - it's ironic that Apple goes to all the trouble to shave off some thickness, and as a result, everyone has to connect huge honking plastic shells with spare batteries to them..
The point on apple pushing thinness is often put forward as pure design decision, but I am more and more convinced the manufacturing costs might have at least an equal part.
Battery is the same on every model, and bumping the battery amount would force them to split the line in two models, which would need a separate fabrication line just for the bigger model, or have a cheap one with the same amount of battery, wich would significantly bump the entry model price.
Specifically the uNu is actually certified by Apple unlike the Mophie (which is strange because Apple's stores carry the Mophie and don't carry the uNu.
The uNu also connects the USB so you can sync, copy, etc through USB unlike the mophie
