The NGC Large Canadarm is a 15m robotic arm that fits inside a minivan when its segments are telescoped together. Although its reach is as long as Canadarm2's, it is lighter and folds up more compactly to fit on future, smaller spacecraft. It will be used on Earth as a testbed to simulate arm deployment during tasks such as capturing and docking spacecraft for refueling. (Source: NASA)
Rob, the Canadarm was designed to work in a weightless, zero-G environment, as we discussed below regarding Lou's comment. So the only "crossover" apps would be others in space, since the arms are too heavy to operate in Earth's 1G.
Researchers have been working on a number of alternative chemistries to lithium-ion for next-gen batteries, silicon-air among them. However, while the technology has been viewed as promising and cost-effective, to date researchers haven’t managed to develop a battery of this chemistry with a viable running time -- until now.
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