The 150 Lumen USB flexlight converts any Voltaic battery or other USB power source into a bright light. It’s bendable neck allows you to point the light wherever you need it most. If you want to catch up on your reading on your next backpacking trip, better bring this along. The Flexlight runs up to 13.5 hours from our V15 battery and weighs just 30 grams. 26 x 1.3 cm.