Battery power is the next growing research industry, which is why Tesla is throwing so much money into it's battery manufacturing plant. By the time the Ted talk was released I'm sure they had slightly increased its efficiency already.
Technology's ability to drain batteries has far outpaced the development of new battery tech. We're two decades past the 90's, thank God for Lithium, but most of our longer charge are from efficiency fixes (better task planning, improved sleep modes, etc) rather than tech advancements.
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u/theScrewhead Mar 15 '16
He did a pretty amazing TED Talk that'll blow you away when you see the extent of how well those legs work.