Live at CES 2012, accessory maker Incipio shows us their next-generation Offgrid Pro case for iPhone. The big difference with the Offgrid Pro is that it has user-swappable batteries so that if you're going to be away from power for a really long time, you can back just as many 1700mAh cartridges as you need.

The Offgrid Pro will be available "soon", and will ship with two batteries, the charger, the case, and the band.

Incipio shows off their next generation Offgrid Pro battery case for iPhone