It may pain you to add girth to the iPhone 5's slender frame, but when a little more junk in your iPhone's trunk means double the battery life, it's hard to say no. The new Mophie Juice Pack Helium case promises to do just that and be about 13% lighter than the iPhone 4's Air version.
We've seen several iPhone battery cases/extenders—and we've liked what we've seen. But offerings like the Fastmac iV have been a bit on the pudgy side.
The Gadget: The Mophie Juice Pack battery extender for the iPhone 3G snugly wraps around your phone and claims to more than double the available power.