The company Powertravelle developed a backup power source Powermonkey Expedition, designed for people who spend a lot of time away from civilization. The device is equipped with a lithium polymer battery that can be recharged from AC mains, manual generator, solar panels, water or air turbine.
This gadget modular design. A cylindrical base unit in an aluminium case contains a lithium-ion polymer battery capacity 10500 mAh. When you attach the 5-volt 5-watt solar panel on a full charge the battery should go from 16 to 21 hours (in clear weather). The device meets the standard of IP65, meaning it is completely protected from dust and moisture.