You can use a large-capacity backup battery to charge your mobile devices during camping or take a look at the PowerPot X, the 10-watt portable generator is also a nice solution.
The PowerPot is a multi functional thermoelectric generator that comes in two sizes including XL and X. As we can see from the images, the generator features an anodized aluminum pot in order that you can use it to cook your food during camping, most importantly, the portable generator also features 4 thermoelectric modules in order to convert heat into electricity and ensure a very reliable 10 watts of power, while using its dual USB output the portable generator is able to charge two mobile devices at the same time. Apart from that, built-in Practical Power let you always know how mush power your mobile devices are receiving. After the break, check out the following demo video.
At present the team of PowerPot is raising fund at Kickstarter. Pledging $189 will let you own the thermoelectric generator. If you’re interested, jump to Kickstarter official site for more details.