Mophie has been making extra-battery cases for smartphones for a while now. The one big change with their latest case, the Juice Pack H2PRO, is that it is also waterproof. So if you are they type who is ok with thickening your iPhone 6 with a battery case, why not make it waterproof while you are at it.
The Mophie Juice Pack H2PRO for iPhone 6 will cost you $129.95 and will ship later this month. You get a rugged waterproof case (MIL-STD 810G and iP-68 rated), an additional 2,750mAh battery, basically doubling your iPhone 6 battery life.