MiFi iPhone Application
The iPhone Appstore now has a little app that tells you how much time is left in your MiFi battery. It is free and simple to use. Just sign into your MiFi and punch the MiFi App to get all the gory details. While the screen display is nothing to write home about and I'd prefer something a bit more specific than just the four bars for battery life, it does provide critical information and the App is free.