So you want to be able to generate power for your smartphone wherever you go? The AMPWARE Case for iPhone 6s can help. It is an emergency charger with an on-board generator that produces up to 1 amp of charge. It has a hand crank that lets you generate up to 1 hour of battery life after 5 minutes of cranking.
The case protects your phone against impact. It is available in Shadow, Sport, and Ranger versions. Costs $79.