Energizer AP1201 iPhone
Energizer has started shipping the AP1201 case for the iPhone 4, which doubles as a lithium polymer battery pack. The case can be recharged 500 times thanks to its own USB charging cable. You can charge the case and iPhone 4 separately or at the same time. The Energizer AP1201 iPhone 4 case is made of recycled silicone rubber and has an integrated bumper, which will eliminate the signal degradation issue with the handset. If you are interested, you can buy the AP1201 for $70 a pop.
