Having owned the Juice Pack Air for my iPhone 3Gs, I knew I had to get one for my new iPhone 4. The new iteration is even better than the almost-perfect predecessor.

The curved back is coated in a rubbery material that holds well in hand. The phone is fully encased and a slightly raised bevel protects the screen.

The bottom right of the case features a microUSB connector for power and data; on the bottom left a switch allows you to set the mode to power or stand-by.
At the bottom of the case, you will find a flush push button and a ramp of four white LEDs indicating the battery charge level.

The box contains the case itself and a USB to microUSB cable for power and data. Considering you won't want to take the phone in and out of the case often, you probably want to get a few more microUSB cables. I found out the hard way that not all microUSB cables will work. Some will charge the case but not the phone while in the case. Ideally, try before you buy.

The switch on the left lets you turn the power on or off. Mophie recommends that you keep the power off until the battery in your phone is depleted, then turn it on; this maximizes the run time you will get from the JuicePack.

One of the issues you will face when using any thick case such as this is that the phone no longer fits in most carry cases designed for it. I loved my Grantwood holster but had to give it up because the JuicePack Air is too big for it. Fortunately, I found an inexpensive, good quality holster that I like: the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Cellet-leather-holster/dp/B000O7H5PC/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Cellet leather holster</a>&nbsp;(under 10 bucks)

Mac|Life magazine just released a test of all battery cases on the market and found the Mophie to be their favorite as offering the best compromise between functionality, style, battery life and charging time.

The biggest downside of this case is that it uses a standard microUSB connector instead of duplicating the iPhone connector. Sure, the microUSB connector is ubiquitous (it has been chosen by the European community as a mandatory cell phone power standard), but I do miss the easy connection to speaker docks. Mophie could offer a dock connector to microUSB cord to alleviate the problem.

One last thing: I had a problem with the cable and contacted Mophie using the email form on their web site. In less than 24 hours I had a friendly reply telling me they had shipped a replacement free of charge. Now that's customer service!

Highly recommended.
Having owned the Juice Pack Air for my iPhone 3Gs, I knew I had to get one for my new iPhone 4. The new iteration is even better than the almost-perfect predecessor. The curved back is coated in a rubbery material that holds well in hand. The phone is fully encased and a slightly raised bevel protects the screen. The bottom right of the case features a microUSB connector for power and data; on the bottom left a switch allows you to set the mode to power or stand-by. At the bottom of the case, you will find a flush push button and a ramp of four white LEDs indicating the battery charge level. The box contains the case itself and a USB to microUSB cable for power and data. Considering you won't want to take the phone in and out of the case often, you probably want to get a few more microUSB cables. I found out the hard way that not all microUSB cables will work. Some will charge the case but not the phone while in the case. Ideally, try before you buy. The switch on the left lets you turn the power on or off. Mophie recommends that you keep the power off until the battery in your phone is depleted, then turn it on; this maximizes the run time you will get from the JuicePack. One of the issues you will face when using any thick case such as this is that the phone no longer fits in most carry cases designed for it. I loved my Grantwood holster but had to give it up because the JuicePack Air is too big for it. Fortunately, I found an inexpensive, good quality holster that I like: the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Cellet-leather-holster/dp/B000O7H5PC/ref=cm_cr_arp_d_rvw_txt? ie=UTF8">Cellet leather holster</a>&nbsp;(under 10 bucks)

Mac|Life magazine just released a test of all battery cases on the market and found the Mophie to be their favorite as offering the best compromise between functionality, style, battery life and charging time. The biggest downside of this case is that it uses a standard microUSB connector instead of duplicating the iPhone connector. Sure, the microUSB connector is ubiquitous (it has been chosen by the European community as a mandatory cell phone power standard), but I do miss the easy connection to speaker docks. Mophie could offer a dock connector to microUSB cord to alleviate the problem. One last thing: I had a problem with the cable and contacted Mophie using the email form on their web site. In less than 24 hours I had a friendly reply telling me they had shipped a replacement free of charge. Now that's customer service! Highly recommended.