This can provide 24 hours of light on a single charge. It runs on solar power, no batteries needed, but includes a USB port to charge your devices.
Promising review: “This little light is amazing. First of all, it charges in the sun easily. It’s practically weightless. Breaks down to a pancake size. It’s great to use inside my tent, or hang outside the tent like a little front porch light. Very handy snap strap. Varying brightness. Have had it for three years, outside in the elements almost every day. Still works great.” —KingOfTheInternet
“We have taken these on five camping trips and used them for extended power outages. Each light puts out a LOT of light. When camping, we use them for about 5+ hours each evening at full brightness. When fully charged, it uses maybe half the battery each night. They charge up very quickly the next day. These are super lightweight. One of the camping trips I took them on was a backpacking trip—I didn’t hesitate to pack them, they take up minimal room and add negligible weight. Super durable also.” —QuirkyScribe
Get it from Amazon for $20.
Source: Culled From BuzzFeed.