User Review: Ozark Trail LED Rechargeable Lantern
The light stayed bright with four regular flashlight D batteries for over 20 hours. I finally turned it off.
If you don't like throwing stuff away you can buy the battery cradle/pack at a Radio Shack for cheap made of plastic with two wires coming off of it. I use alligators clips to make the connection and it is polarity sensitive.
I'm going to cut the plastic up to make a better cradle or you can quick fasten it up with duct tape. Now I have a conversation piece of gear.