I am surprised this isn’t brighter with the # of LED’s the author has. Basically its two containers, an inner one to hold the battery and wrap the LEDs on, and an outer one to protect it. Nice build but….I think I could buy something cheaper and with a hook. And takes standard batteries I could buy at the store. (figure $5 for the LEDs, $10 for the battery, then a charger ($5)). But it won’t look at neat as this build.
http://www.instructables.com/id/DIY-Splash-proof-LED-Camping-Lantern/