Here's an option for those who don't look for easy ways when it is time to change the battery on the iPhone.
What you see here is the do-it-yourself iPhone battery replacement kit. With it you'll be able to replace the battery without having to send the handset to Apple. All you have to do is replace the old battery connection with the new one by soldering it to the existing wires. Simple...
Just don't brick the device, ok? The whole kit will cost you $25.