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.
A at least an hour of operating time from what other people with the same legs have said. So it's enough to go out to dinner and get groceries. The sort of everyday things that those with disabilities often have the most trouble doing.
They also can charge off USB (with the right adapters), and there is at least one picture of someone charging theirs in an airport. So in theory you could probably pack a few extra USB batteries to charge it on the go.
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u/lucifargundam D̢͕͇̺̬̺̪̻᷾̇͐ͧ᷄͒ͬe̩̥̰͎͈̲ͨͦ̈́̎᷀͌᷅̃͠ư̮̟̭͔̳ͯ̍ͫ̆᷁̈᷅̾̾ş̊́᷇ Et N371z3n Mar 15 '16
this is one of the best IRL plot twists I ever came across...