I think this is the best battery to use when you’re on the go. All of the external charges need to be plugged in so they can charge, so that’s something you need to do before taking it to report. But this particular tool saved me when we went to cover an event once. Let’s say you completely forgot to charge your phone and now you need to go out and report. Or you have been using your phone all day and then a breaking news story erupts but your phone might die at any moment. This tool comes to the rescue.
The Juice Pack Air is light and fits right onto the phone. It’s not distracting or annoying to try and store. It basically just feels like you have a case on your phone, but it's really a battery. Certain external batteries get in the way when you’re trying to use the phone to capture audio and video, but this one does a good job of being mobile. It’s secure and you don’t need to baby it or hold the phone a certain way. Just leave it on your iPhone until it’s charged, or keep it on until you’re done with your assignment. It can really be a lifesaver.
The Boost is something you'd use if you didn't bring your charger. It's not really a mobile battery, it's something you'd plug into your phone and leave in until it's ready to go. It's just another option. It's useful if you don't need to actually do any work right away. They both charge the iPhone within a couple of hours. If you leave the Air on, it doesn't really matter how long it takes to charge because you can use the phone while it's doing its job.