Astronauts to finish installing batteries during Jan. 13 spacewalk
/The International Space Station crew is gearing up for the second of two spacewalks aimed at replacing aging nickel-hydrogen batteries with new lithium-ion units. Two astronauts will leave the Quest airlock at around 7 a.m. EST (12:00 GMT) Jan. 13, 2017, for an estimated six-and-a-half-hour-long excursion.
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