Newegg has a new discount on this Kensington K39260US Black PowerGuard Battery Case for iPhone 4 which is $69.99 – $52 Instant Discount + Free 2-Day Shipping = $17.99!
Give your iPhone 4 the extra power it needs to keep it going over even longer periods! With this Kensington iPhone case not only can you protect your iPhone from damage with a tough shell you can also give it extra battery life at the same time! It adds an extra 4 hours of talking time, 5 hours of video watching and even 22 hours of music onto what already exists in the battery. It also includes card stands and two position stands to hold your iPhone in both hands free portrait or landscape modes for Facetime talking without holding it. It also has an LED battery indicator.