Diabytes
NASA astronauts spacewalk News
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The new lithium-ion batteries -big, boxy units with a mass of around 400 pounds (180 kgs) - are so powerful that only half as many are needed
The batteries store power gathered by the station's solar panels for use on the nighttime side of Earth
The battery replacements began 3 1/2 years ago, with 48 old batteries targeted for replacement
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Friday's spacewalk is the 190th in support of the International Space Station, which just marked 15 continuous years of human habitation.
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