IPhone 3G  uses Smaller Battery / Question

According to this tear down:
http://live.ifixit.com/Guide/First-Look/iPhone3G
The battery is actually lower in capacity than of the original iPhone.
My question is: Would it be possible to replace the included Battery with a larger size?

Ouch! That's certainly a bummer... why would Apple do this? If they complain 3G ***** down more battery (the reason why 3G was not included in the original iPhone, and the fact that the 3G settings screen says it too), you would think that the iPhone 3G would have at least the same battery capacity if not more.
I think this is a conspiracy to get people to subscribe to mobile me to get push email instead of people like me who set my phone to fetch mail every 15 minutes. My battery on the iPhone 3G is down to 10% at night with very little use throughout the day (other than checking mail and a couple of phone calls). And I only have 1 email account set up.
Compared to my original iPhone, I have 3 email accounts that are checked every 15 minutes, and I'm usually at 40% battery left when I go to bed at night.

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