Tech Review: Third Rail Battery Case Delivers Snap-on Juice for iPhone 4

Posted in MONEY

The iPhone 4's built-in battery should last you an entire day of moderate use, with room to spare. If, on the other hand, you've been holding epic conference calls on the iPhone 4's spearkerphone — or worse yet, streaming YouTube all day in a spotty 3G coverage area — your precious handset will run out [...]