Looks like the rumors were true. Mophie has just released the Juice Pack Air for the iPhone 4 which serves as a protective case and includes a built-in 1,500mAh lithium-polymer batter to keep your iPhone 4 juiced at all times.

The Juice Pack Air offers up to 6 hours of extra talk time on 3G networks, up to 12 hours on 2G networks, up to 36 hours of added music or 9 hours of video. The Juice Pack Air is currently available for purchase and will run you $80.

One of the worst things about my original iPhone is that the battery just doesn’t last long. If I play games for more than half an hour half the battery life is gone and surfing the net on the device does the same thing. I purchased a Mophie Juice Pack for my original iPhone to solve this problem.

Mophie announced a new product for the iPhone 3G back in February called the Juice Pack Air. The device is billed as the world’s thinnest external battery/protective case available for the iPhone 3G.