How are the Iphone batteries different?

I have a iphone 2g and I'm going to mod it so I can get the 4S operating system. But I'm afraid that it will drain the battery. How does the iphone 2g battery differ from the others

The 2G wasn't designed to use iOS 6 operating system. So yes, you'll see a huge difference in battery life. Because it is too much for the battery to handle.

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