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If your iPhone has a case of the "I can't make it through half a day on one charge," it may be time for a replacement battery.
if you're looking to replace the battery in your iPhone and you're feeling adventurous, we ripped apart a first-generation iPhone and iPhone 3G on video just for you.
A word of caution, while the iPhone 3G and 3GS are relatively simple to take apart, the original iPhone can be difficult and there is a high likelihood that you'll damage the case.
You have been warned!
What You Need:
> New iPhone battery (3G and 3GS $19.95, ifixit.com. First Generation - $14.95 iFixit.com)
> Phillips 00 screwdriver (iFixit includes one with your battery)
> Two spudgers (we used one pointy black spudger and one flatter greenish spudger)
> A soft cloth to cover your work surface
> Small suction cup ($2.95, ifixit.com)
Replace the original iPhone's battery:
Replace the iPhone 3G and 3GS's battery: