I NEED TO LOOK INTO THIS
Mophie, who has long made battery packs for the iPhone is well aware of this and in fact encourages such behavior. After all, they did release their very own trail map app. And with it has come their Juice Pack Plus Outdoor Edition battery pack.
It uses the same battery as found in their Juice Pack Plus battery, but the case has been upgraded to add greater protection against dings and drops. The dual-injected hard shell case sports a rubberized band around its circumference.