The QinetiQ Zephyr is a lightweight solar-powered unmanned aerial vehicle (UAV). As of 23 July 2010 it holds the endurance record for an unmanned aerial vehicle of over 2 weeks (336 hours). It is of carbon fiber-reinforced polymer construction, the 2010 version weighing (the 2008 version weighed ) with a span of 22.5 metres (the 2008 version had ). During the day it uses sunlight to charge lithium-sulphur batteries, which power the aircraft at night. In July 2010 a Zephyr made a world record UAV endurance flight of 336 hours, 22 minutes and 8 seconds (more than two weeks) and also set an altitude record of for FAI class U-1.c (remotely controlled UAV: weight 50 kg to less than 500 kg).