This thread reminded me what a genius The Professor on Gilligan's Island was. People often ask how the radio lasted so long... the professor hooked it up to the bicycle charger and essentially (super) wound up the radio 40 years before such a product became a reality... a much grander scale of the current consumer models of course (The Professor was always such a show-off
) and it lasted them for the rest of the series (It wore out before the movies).
Personally, I'll take the 4 cranks for 2 hours
