Recently I picked up one of the Mophie Juice Pack Air external battery (in Black) for my iPhone because I felt like I was running out of battery life faster than I would have liked.
Since I bought the Juice Pack Air I have been getting two full days of battery life with my iPhone (and I use it a lot!) which was a major improvement over the one day I was getting previously.
The Mophie Juice Pack Air doesn’t only extend the battery life of your iPhone—it also acts as a case for the iPhone which is an added benefit because I know my iPhone is protected.
The thing that is really nice about the Juice Pack is that to charge it I don’t have to take the case on and off—there is a mini-USB port on the case that allows me to plug in a mini-USB to USB cable (included) so I can charge the case up and sync it to my computer or plug it into my iPhone’s USB charger.
The Juice Pack Air also has built in overcharge, short-circuit and temperature protection so I don’t have to worry about damaging my iPhone in any way.
The Mophie Juice Pack Air is the thinnest external battery for the iPhone and I highly recommend it.