uNu has rolled out the Ex-Era battery case for Apple’s iPhone 4 and iPhone 4S. What makes this battery case special is that you can change its bumpers and backcovers in a great selection colors to match your latest fashion accessories. What’s more, you can also change its swappable 1,700mAh battery module with a more powerful uNu battery cell. Each purchase comes equipped with a screen protector and a cleaning cloth. The uNu Ex-Era offers open access to all ports, cameras, and controls. You can purchase the uNu Ex-Era battery case for the iPhone 4 and iPhone 4S for $79.95. Watch the video after the jump.