Associated Press
FILE - In a Sept. 1, 1966 file photo, a model looks at the Sinclair Micro vision set, a pocket size television set designed by Clive Sinclair that can go anywhere and claims to be the world's smallest TV, at Earls Court, London. The rectangular face plate of the cathode tube has a diagonal measurement of two inches. It’s been nearly a quarter of a century since the last big jump in battery technology, which led to the lithium ion. As 21st century technology strains to be ever faster, cleaner and cheaper, the battery, an invention from more than 200 years ago keeps holding it back.  (AP Photo, File)

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