This solar flashlight is always ready to go. It holds a single charge for over 3 years and comes fully charged. A full charge from the sun provides 16 hours of run time. And, just in case you run out of juice from the solar charge, it has a backup emergency battery with a 7 year shelf life. It features bright 2 LED, 1-Watt lights with 11 to 22 continuous years of burn time. Guaranteed for life, the flashlight is also waterproof up to 80 ft. and it floats.