Green House Co. Ltd has developed a lantern that runs on salt water. Yup, salt water; no battery required. This was developed after the Fukushima nuclear disaster in Japan, where as you know there really isn’t a short supply of salt water to be had. A mixture of 350 milliliters of water and 16 grams of salt allows the lantern to use its internal magnesium and carbon rods to generate enough power to act as a light source for up to eight hours. But it’s not just a lantern! It also has a USB port, so you can charge whatever gadget you find most necessary to have (I’m sure in most cases, that would be a phone).
The magnesium rod will need to be replaced, but is supposed to be good for up to 120 hours of operation. It’s also supposed to be pretty easy to replace with a new one. After eight hours of use, all you need to do is refill the bag with fresh salt water, and you’ll be set for another eight hours of light and charging.
No word on price yet, but this is supposed to be available in Japan by the end of this month.