said by voipdabbler :

LOL, Johnny. You're wrong about the battery on the iPhone--here's a link from Apple support telling you about how much you'll have to pay them to replace your battery. Apple Support Fees for iPhone battery replacement

The battery in the new generation 3G phone is still sealed (in fact it's more than sealed--it's soldered on to the phone). Your belief that the battery is user replaceable is fueled by wishful speculation on the web that the 2 small screws visible in the Apple video tour meant users could replace their own battery. Even if you are able to get the screws out, you're stuck trying to remove the soldered battery as well as re-solder a replacement.

And yes, enterprises aren't buying the iPhone as of yet--it's consumers driving the marketing right now.