It would seem that mophie's juice pack supplementary battery for the iPhone proved to be popular enough for the company to release new and improved versions onto the market, the latest (7'th generation) being designed to work well with the iPhone 4.

The new juice pack air virtually doubles the battery life of the iPhone and its soft touch hardware also provides protection from device bumps, bangs and drops.

Similar to the other mophie solutions, the device delivers rechargeable external battery power concealed inside of a protective form-fitting case and also offers the full protection of a hard-shell case with an ultra-thin, light-weight, low-profile design.

Moreover, embedded electronics results in no signal interference with the iPhone and the case design acts as a virtual speaker box, redirecting sound from the bottom of the iPhone 4 to the front, resulting in a richer, fuller sound quality.

The battery pack sports a an integrated LED status indicator that tells users exactly how much "juice" is left and also displays how much time remains during the charging process, which leverages the 500 milliamps fast charge technology, with an advanced battery for added safety, as well as 1500 mAh capacity.

Plus, the included USB cable enables users to simultaneously charge and sync their iPhone 4 to iTunes without having to remove it from the juice pack air.

"mophie's passion is creating intelligent products that help Apple fans interact with their device in new ways," says Ross Howe, Vice President of Business Development at mophie.

"With the release of the next generation form factor, it is only natural that we provide its users the extended battery life and protection that Apple fans have come to expect from mophie," Mr. Howe added.

The juice pack air for iPhone 4 is now available for purchase for $79.95, which is not exactly a very small price to pay for this thing, but it's probably worth it, given the impressive extra battery life it provides for Apple's handset.  

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