A long endurance polymer electrolyte membrane fuel cell promises to extend the  range of small Unmanned Aerial Systems (UAS) as much as 300%. The 4.4 lb (2 kg)  unit operates at up to 22,000 ft (6,700 m) and stores 900 watt-hours of electric  power. The power pack should soar past advanced lithium batteries in the 5-10 kg  class of surveillance  and reconnaissance UAS.
 
 
 
 
 
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