Here is another solar iPhone case that lets you use your smartphone outdoors without having to worry about running out of battery. The case is rugged and waterproof. Its solar panel trickle charges the case battery in sunlight. SLXtreme for iPhone 7 can protect your phone from drops up to 6.6ft.
You can slide your phone in and out through the bottom and secure it with nickel alloy metal latches. The case also has a 4000 mAh battery to provide you with 23+ hours of additional talk time.[where to get it]