
You can now replace the battery in your iPhone if you feel daring enough for $25 from
USB Fever according to
iPhone Atlas. "If you’re willing to void your iPhone’s warranty and risk serious, irreparable damage to the unit, you can undercut Apple’s price of a replacement battery by more than $60. USB Fever is now selling a replacement battery for the iPhone, with an accompanying toolset and installation instructions, for $25. Though the product selling page doesn’t mention it, this type of installation generally requiring soldering."
iPhone Atlas for the full story.