There are plenty of ways to charge a smartphone when you are spending time outdoors or experiencing a power outage. When everything else fails, you can use this 18650 charger to recharge your phone with a battery. These chargers are available in Lightning and Micro USB versions. They have a magnetic design and are compact enough to fit in your pocket.
As you can see in the above video, this device can recharge an iPhone with a Tokeyla 18650 rechargeable battery.