Spacewalkers complete 4 years of power upgrades for station

CAPE CANAVERAL, Fla. (AP) — A pair of spacewalking astronauts completed a four-year effort to modernize the International Space Station’s power grid on Monday, installing one last battery. Over the weekend, flight controllers in Houston used the space station’s big robot arm to replace the last pair of old-style batteries with a single better-quality one. […]