Almost 170 teams competed for the Wearable Power Prize, a Pentagon-sponsored contest to invent a better power system.
The winner of the million-dollar prize was a team from DuPont in Wilmington, Del.
Troops who use electronic devices such as night-vision goggles and GPS units have to carry batteries that can add 20 pounds to their loads.
The military created the contest to find a system that produces more power with less weight - light enough that soldiers can wear it on their vests.
The second prize of $500,000 went to Adaptive Materials Inc. of Ann Arbor, Mich., while a team identified as Jenny 600S of Middleburg, Va., won the $250,000 third prize.
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