Handheld power ratchet tools, which NASA astronauts used to service the
orbiting Hubble telescope, were powered by lithium-ion battery packs
supplied by Saft. The high power 18650 cells that make up the battery
pack measure 18x6x50mm and weigh just 40gm; eighteen of them are packaged
into a robust metal case that connects to the power ratchet tool via an
umbilical electrical cable. The lithium technology replaces earlier
silver-zinc batteries that were used on Shuttle missions.
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