Spacewalk astronauts tackle battery upgrade on space station

Two NASA astronauts began an epic battery swap on a spacewalk outside the International Space Station on Friday (June 26), the first of four excursions to update the outpost.

NASA astronauts Chris Cassidy and Bob Behnken, both veteran spacewalkers performing their seventh extravehicular activity (EVA), traded in three aged nickel-hydrogen batteries for two more efficient lithium-ion batteries, easily completing the job before Your spacewalk will conclude in 6 hours, 7 minutes at 1:39 pm EDT (1739 GMT)