If you look at the back of the iPhone, notice the removable battery enclosure.
Pictures of the back of the iPhone do not seem to be widely available. Perhaps you could post one.
I was going on published reports that the battery was not a user installed option, ala iPod.
Touchscreen pros:
1. Doesn't require a hardwired set of extremely small buttons. Instead, you just present the buttons that are needed for the current task, at the most appropriate size, configuration and position for that task.
2. The multi-touch concept is pretty powerful. Design the UI so I can use my fingers as if they were fingers, not just a mouse attached to my hand.
Touchscreen cons:
3. You have to look & aim carefully. You can't let your fingers just feel your way to a specific letter of button.
4. Touchscreens are prone to damage and to physical degradation from dirty fingers.
#4 is prob the biggest problem. Spend $500 on a phone that won't last as long?