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Just for notebook computers now, enough of these -as in the over 6,000 such cells that propel a Tesla, could have a profound short-term effect on our hopes for electric flight. The 18650 (18 mm in diameter, 65 mm long) cells by Panasonic are the first to offer a silicon alloy anode, a commercial verification of the research Drs. Cui and Cho have been performing. Panasonic promises 4.0 Amp hours capacity, almost 30-percent more than current lithium cells of the same size. This allows a notebook battery pack almost half the size of one using graphite anode cells. The good news is balanced by the fact that the Si-based cell, at 54 grams each, weighs 10 grams more than the …