FlameStower
Portable USB batteries are great, but what happens if they run out of power? That is where FlameStower comes in. Instead of having to use a portable battery, the heat from your campfire is converted into electricity to power your electronics. You just slide the FlameStower into your fire and your phone or camera can charge. It outputs 2.5 Watts, so it can charge an iPhone completely in about 3 hours.